Question Pool
NCVEC PUBLIC DOMAIN RELEASE – REVISED January 31, 2012
2012-2016 ELEMENT 4 EXTRA CLASS QUESTION POOL
Effective July 1, 2012 to June 30, 2016
Errata – January 31, 2012 to the December 13, 2011 Release
E1A06 – Corrected wording of question and distractor B to:
Which of the following describes the rules for operation on the 60 meter band?
A. Working DX is not permitted
B. Operation is restricted to specific emission types and specific channels
C. Operation is restricted to LSB
D. All of these choices are correct
E1C09 - Correction in the question: Changed "Mhz" to "MHz"
E1E05 - Correction of missing wording in distractor D: Minimum passing score of 77%
E2A14 – Deleted question
E2D11 - Changed wording of question and distractors to:
Which of the following data are used by the APRS network to communicate your
location?
A. Polar coordinates
B. Time and frequency
C. Radio direction finding LOPs
D. Latitude and longitude
E3C01 – Changed wording of distractor C: New wording:
C. CW signals appear to be modulated by white noise
E3C06 - Change wording of question: By how much does the VHF/UHF radio-path horizon
distance exceed the geometric horizon?
E3C07 - Correction in the question: "it's" to "its"
E3C09 - Changed distractor D: to Ground wave
E4B09 - Correction of the word feedline to feed line in distractors
E4D01 - Changed wording of distractor A:
A. The difference in dB between the noise floor and the level of an incoming signal
which will cause 1 dB of gain compression
E5C22 - Correction to answers A and B: Removed extra spaces in values
E5D17 - Correctly renumbered question to E5D16
E5D18 – Correction in wording of question:
How many watts are consumed in a circuit having a power factor of 0.71 if the
apparent power is 500 VA?
E6A08 - Changed wording in question to "grounded-base": hyphenated
E6D05 - Correction of missing word in distractor B:
A display using a crystalline liquid which, in conjunction with polarizing filters,
becomes opaque when voltage is applied
E6E07 - Change wording of question to:
Which of the following techniques is typically used to construct a MMIC-based
microwave amplifier?
E7A15 - Removed the “?” at end of distractor A
E7B08 - Changed wording in distractor C:
C. By feeding a 180-degree out-of-phase portion of the output back to the input
E7C12 - Changed “pi”-L to Pi-L in question and to Pi in distractor B
E7C13 - Correction in wording of question: capitalization changes in distractors A, B
and C:
What is one advantage of a Pi matching network over an L matching network consisting
of a single inductor and a single capacitor?
A. The Q of Pi networks can be varied depending on the component values chosen
B. L networks can not perform impedance transformation
C. Pi networks have fewer components
D. Pi networks are designed for balanced input and output
E7G13 - Change wording of distractor C to: The differential input voltage needed to
bring the open-loop output voltage to zero
E8D06 - Correction of hyphenated word feed-line in C: changed to feed line. Removed
quotations in distractor D:
"flat-topping"
E9 Syllabus title - Corrected: ANTENNAS AND TRANSMISSION LINES in both syllabus
outline and E9 section of pool
E9B11 - Correction of hyphenated word feed-point in C: changed to feed point
E9E03 - Changed wording of question: What is the name of the matching system that
uses a section of transmission line connected in parallel with the feed line at or
near the feed point?
E9E07 - Correction of typo in D: "constant" should not be capitalized
E9E09, E9E10, E9E11, E9E12 - Corrections of hyphenated feed-line and conjoined use of
feedline’; changed all instances to “feed line” in questions and/or answers
E9E12 - removed quotations around "phasing line" in question
~~~ end of errata~~~
SYLLABUS
SUBELEMENT E1 - COMMISSION’S RULES [6 Exam Questions - 6 Groups]
E1A Operating Standards: frequency privileges; emission standards; automatic message
forwarding; frequency sharing; stations aboard ships or aircraft
E1B Station restrictions and special operations: restrictions on station location;
general operating restrictions, spurious emissions, control operator reimbursement;
antenna structure restrictions; RACES operations
E1C Station control: definitions and restrictions pertaining to local, automatic and
remote control operation; control operator responsibilities for remote and
automatically controlled stations
E1D Amateur Satellite service: definitions and purpose; license requirements for
space stations; available frequencies and bands; telecommand and telemetry
operations; restrictions, and special provisions; notification requirements
E1E Volunteer examiner program: definitions, qualifications, preparation and
administration of exams; accreditation; question pools; documentation requirements
E1F Miscellaneous rules: external RF power amplifiers; national quiet zone; business
communications; compensated communications; spread spectrum; auxiliary stations;
reciprocal operating privileges; IARP and CEPT licenses; third party communications
with foreign countries; special temporary authority
SUBELEMENT E2 - OPERATING PROCEDURES [5 Exam Questions - 5 Groups]
E2A Amateur radio in space: amateur satellites; orbital mechanics; frequencies and
modes; satellite hardware; satellite operations
E2B Television practices: fast scan television standards and techniques; slow scan
television standards and techniques
E2C Operating methods: contest and DX operating; spread-spectrum transmissions;
selecting an operating frequency
E2D Operating methods: VHF and UHF digital modes; APRS
E2E Operating methods: operating HF digital modes; error correction
SUBELEMENT E3 - RADIO WAVE PROPAGATION [3 Exam Questions - 3 Groups]
E3A Propagation and technique, Earth-Moon-Earth communications; meteor scatter
E3B Propagation and technique, trans-equatorial; long path; gray-line; multi-path
propagation
E3C Propagation and technique, Aurora propagation; selective fading; radio-path
horizon; take-off angle over flat or sloping terrain; effects of ground on
propagation; less common propagation modes
SUBELEMENT E4 - AMATEUR PRACTICES [5 Exam Questions - 5 Groups]
E4A Test equipment: analog and digital instruments; spectrum and network analyzers,
antenna analyzers; oscilloscopes; testing transistors; RF measurements
E4B Measurement technique and limitations: instrument accuracy and performance
limitations; probes; techniques to minimize errors; measurement of "Q"; instrument
calibration
E4C Receiver performance characteristics, phase noise, capture effect, noise floor,
image rejection, MDS, signal-to-noise-ratio; selectivity
E4D Receiver performance characteristics, blocking dynamic range, intermodulation and
cross-modulation interference; 3rd order intercept; desensitization; preselection
E4E Noise suppression: system noise; electrical appliance noise; line noise; locating
noise sources; DSP noise reduction; noise blankers
SUBELEMENT E5 - ELECTRICAL PRINCIPLES [4 Exam Questions - 4 Groups]
E5A Resonance and Q: characteristics of resonant circuits: series and parallel
resonance; Q; half-power bandwidth; phase relationships in reactive circuits
E5B Time constants and phase relationships: RLC time constants: definition; time
constants in RL and RC circuits; phase angle between voltage and current; phase
angles of series and parallel circuits
E5C Impedance plots and coordinate systems: plotting impedances in polar coordinates;
rectangular coordinates
E5D AC and RF energy in real circuits: skin effect; electrostatic and electromagnetic
fields; reactive power; power factor; coordinate systems
SUBELEMENT E6 - CIRCUIT COMPONENTS [6 Exam Questions - 6 Groups]
E6A Semiconductor materials and devices: semiconductor materials germanium, silicon,
P-type, N-type; transistor types: NPN, PNP, junction, field-effect transistors:
enhancement mode; depletion mode; MOS; CMOS; N-channel; P-channel
E6B Semiconductor diodes
E6C Integrated circuits: TTL digital integrated circuits; CMOS digital integrated
circuits; gates
E6D Optical devices and toroids: cathode-ray tube devices; charge-coupled devices
(CCDs); liquid crystal displays (LCDs); toroids: permeability, core material,
selecting, winding
E6E Piezoelectric crystals and MMICs: quartz crystals; crystal oscillators and
filters; monolithic amplifiers
E6F Optical components and power systems: photoconductive principles and effects,
photovoltaic systems, optical couplers, optical sensors, and optoisolators
SUBELEMENT E7 - PRACTICAL CIRCUITS [8 Exam Questions - 8 Groups]
E7A Digital circuits: digital circuit principles and logic circuits: classes of logic
elements; positive and negative logic; frequency dividers; truth tables
E7B Amplifiers: Class of operation; vacuum tube and solid-state circuits; distortion
and intermodulation; spurious and parasitic suppression; microwave amplifiers
E7C Filters and matching networks: filters and impedance matching networks: types of
networks; types of filters; filter applications; filter characteristics; impedance
matching; DSP filtering
E7D Power supplies and voltage regulators
E7E Modulation and demodulation: reactance, phase and balanced modulators; detectors;
mixer stages; DSP modulation and demodulation; software defined radio systems
E7F Frequency markers and counters: frequency divider circuits; frequency marker
generators; frequency counters
E7G Active filters and op-amps: active audio filters; characteristics; basic circuit
design; operational amplifiers
E7H Oscillators and signal sources: types of oscillators; synthesizers and phaselocked loops; direct digital synthesizers
SUBELEMENT E8 - SIGNALS AND EMISSIONS [4 Exam Questions - 4 Groups]
E8A AC waveforms: sine, square, sawtooth and irregular waveforms; AC measurements;
average and PEP of RF signals; pulse and digital signal waveforms
E8B Modulation and demodulation: modulation methods; modulation index and deviation
ratio; pulse modulation; frequency and time division multiplexing
E8C Digital signals: digital communications modes; CW; information rate vs.
bandwidth; spread-spectrum communications; modulation methods
E8D Waves, measurements, and RF grounding: peak-to-peak values, polarization; RF
grounding
SUBELEMENT E9 - ANTENNAS AND TRANSMISSION LINES [8 Exam Questions - 8 Groups]
E9A Isotropic and gain antennas: definition; used as a standard for comparison;
radiation pattern; basic antenna parameters: radiation resistance and reactance,
gain, beamwidth, efficiency
E9B Antenna patterns: E and H plane patterns; gain as a function of pattern; antenna
design; Yagi antennas
E9C Wire and phased vertical antennas: beverage antennas; terminated and resonant
rhombic antennas; elevation above real ground; ground effects as related to
polarization; take-off angles
E9D Directional antennas: gain; satellite antennas; antenna beamwidth; losses; SWR
bandwidth; antenna efficiency; shortened and mobile antennas; grounding
E9E Matching: matching antennas to feed lines; power dividers
E9F Transmission lines: characteristics of open and shorted feed lines: 1/8
wavelength; 1/4 wavelength; 1/2 wavelength; feed lines: coax versus open-wire;
velocity factor; electrical length; transformation characteristics of line terminated
in impedance not equal to characteristic impedance
E9G The Smith chart
E9H Effective radiated power; system gains and losses; radio direction finding
antennas
SUBELEMENT E0 – SAFETY - [1 exam question -– 1 group]
E0A Safety: amateur radio safety practices; RF radiation hazards; hazardous materials
~~ End of Syllabus ~~
2012-2016 ELEMENT 4 EXTRA CLASS QUESTION POOL
As Modified January 30, 2012 to be
Effective July 1, 2012 - June 30, 2016
SUBELEMENT E1 - COMMISSION’S RULES [6 Exam Questions - 6 Groups]
E1A Operating Standards: frequency privileges; emission standards; automatic message
forwarding; frequency sharing; stations aboard ships or aircraft
E1A01 (D) [97.301, 97.305]
When using a transceiver that displays the carrier frequency of phone signals, which
of the following displayed frequencies represents the highest frequency at which a
properly adjusted USB emission will be totally within the band?
A. The exact upper band edge
B. 300 Hz below the upper band edge
C. 1 kHz below the upper band edge
D. 3 kHz below the upper band edge
~~
E1A02 (D) [97.301, 97.305]
When using a transceiver that displays the carrier frequency of phone signals, which
of the following displayed frequencies represents the lowest frequency at which a
properly adjusted LSB emission will be totally within the band?
A. The exact lower band edge
B. 300 Hz above the lower band edge
C. 1 kHz above the lower band edge
D. 3 kHz above the lower band edge
~~
E1A03 (C) [97.301, 97.305]
With your transceiver displaying the carrier frequency of phone signals, you hear a
DX station's CQ on 14.349 MHz USB. Is it legal to return the call using upper
sideband on the same frequency?
A. Yes, because the DX station initiated the contact
B. Yes, because the displayed frequency is within the 20 meter band
C. No, my sidebands will extend beyond the band edge
D. No, USA stations are not permitted to use phone emissions above 14.340 MHz
~~
E1A04 (C) [97.301, 97.305]
With your transceiver displaying the carrier frequency of phone signals, you hear a
DX station calling CQ on 3.601 MHz LSB. Is it legal to return the call using lower
sideband on the same frequency?
A. Yes, because the DX station initiated the contact
B. Yes, because the displayed frequency is within the 75 meter phone band segment
C. No, my sidebands will extend beyond the edge of the phone band segment
D. No, USA stations are not permitted to use phone emissions below 3.610 MHz
~~
E1A05 (C) [97.313]
What is the maximum power output permitted on the 60 meter band?
A. 50 watts PEP effective radiated power relative to an isotropic radiator
B. 50 watts PEP effective radiated power relative to a dipole
C. 100 watts PEP effective radiated power relative to the gain of a half-wave dipole
D. 100 watts PEP effective radiated power relative to an isotropic radiator
~~
E1A06 (B) [97.303]
Which of the following describes the rules for operation on the 60 meter band?
A. Working DX is not permitted
B. Operation is restricted to specific emission types and specific channels
C. Operation is restricted to LSB
D. All of these choices are correct
~~
E1A07 (D) [97.303]
What is the only amateur band where transmission on specific channels rather than a
range of frequencies is permitted?
A. 12 meter band
B. 17 meter band
C. 30 meter band
D. 60 meter band
~~
E1A08 (B) [97.219]
If a station in a message forwarding system inadvertently forwards a message that is
in violation of FCC rules, who is primarily accountable for the rules violation?
A. The control operator of the packet bulletin board station
B. The control operator of the originating station
C. The control operators of all the stations in the system
D. The control operators of all the stations in the system not authenticating the
source from which they accept communications
~~
E1A09 (A) [97.219]
What is the first action you should take if your digital message forwarding station
inadvertently forwards a communication that violates FCC rules?
A. Discontinue forwarding the communication as soon as you become aware of it
B. Notify the originating station that the communication does not comply with FCC
rules
C. Notify the nearest FCC Field Engineer’s office
D. Discontinue forwarding all messages
~~
E1A10 (A) [97.11]
If an amateur station is installed aboard a ship or aircraft, what condition must be
met before the station is operated?
A. Its operation must be approved by the master of the ship or the pilot in command
of the aircraft
B. The amateur station operator must agree to not transmit when the main ship or
aircraft radios are in use
C. It must have a power supply that is completely independent of the main ship or
aircraft power supply
D. Its operator must have an FCC Marine or Aircraft endorsement on his or her amateur
license
~~
E1A11 (B) [97.5]
What authorization or licensing is required when operating an amateur station aboard
a US-registered vessel in international waters?
A. Any amateur license with an FCC Marine or Aircraft endorsement
B. Any FCC-issued amateur license or a reciprocal permit for an alien amateur
licensee
C. Only General class or higher amateur licenses
D. An unrestricted Radiotelephone Operator Permit
~~
E1A12 (C) [97.301, 97.305]
With your transceiver displaying the carrier frequency of CW signals, you hear a DX
station's CQ on 3.500 MHz. Is it legal to return the call using CW on the same
frequency?
A. Yes, the DX station initiated the contact
B. Yes, the displayed frequency is within the 80 meter CW band segment
C. No, sidebands from the CW signal will be out of the band.
D. No, USA stations are not permitted to use CW emissions below 3.525 MHz
~~
E1A13 (B) [97.5]
Who must be in physical control of the station apparatus of an amateur station aboard
any vessel or craft that is documented or registered in the United States?
A. Only a person with an FCC Marine Radio
B. Any person holding an FCC-issued amateur license or who is authorized for alien
reciprocal operation
C. Only a person named in an amateur station license grant
D. Any person named in an amateur station license grant or a person holding an
unrestricted Radiotelephone Operator Permit
~~
E1B Station restrictions and special operations: restrictions on station location;
general operating restrictions; spurious emissions, control operator reimbursement;
antenna structure restrictions; RACES operations
E1B01 (D) [97.3]
Which of the following constitutes a spurious emission?
A. An amateur station transmission made at random without the proper call sign
identification
B. A signal transmitted to prevent its detection by any station other than the
intended recipient
C. Any transmitted bogus signal that interferes with another licensed radio station
D. An emission outside its necessary bandwidth that can be reduced or eliminated
without affecting the information transmitted
~~
E1B02 (D) [97.13]
Which of the following factors might cause the physical location of an amateur
station apparatus or antenna structure to be restricted?
A. The location is near an area of political conflict
B. The location is of geographical or horticultural importance
C. The location is in an ITU zone designated for coordination with one or more
foreign governments
D. The location is of environmental importance or significant in American history,
architecture, or culture
~~
E1B03 (A) [97.13]
Within what distance must an amateur station protect an FCC monitoring facility from
harmful interference?
A. 1 mile
B. 3 miles
C. 10 miles
D. 30 miles
~~
E1B04 (C) [97.13, 1.1305-1.1319]
What must be done before placing an amateur station within an officially designated
wilderness area or wildlife preserve, or an area listed in the National Register of
Historical Places?
A. A proposal must be submitted to the National Park Service
B. A letter of intent must be filed with the National Audubon Society
C. An Environmental Assessment must be submitted to the FCC
D. A form FSD-15 must be submitted to the Department of the Interior
~~
E1B05 (D) [97.303]
What is the maximum bandwidth for a data emission on 60 meters?
A. 60 Hz
B. 170 Hz
C. 1.5 kHz
D. 2.8 kHz
~~
E1B06 (A) [97.15]
Which of the following additional rules apply if you are installing an amateur
station antenna at a site at or near a public use airport?
A. You may have to notify the Federal Aviation Administration and register it with
the FCC as required by Part 17 of FCC rules
B. No special rules apply if your antenna structure will be less than 300 feet in
height
C. You must file an Environmental Impact Statement with the EPA before construction
begins
D. You must obtain a construction permit from the airport zoning authority
~~
E1B07 (B) [97.15]
Where must the carrier frequency of a CW signal be set to comply with FCC rules for
60 meter operation?
A.
B.
C.
D.
~~
At
At
At
On
the
the
the
any
lowest frequency of the channel
center frequency of the channel
highest frequency of the channel
frequency where the signal’s sidebands are within the channel
E1B08 (D) [97.121]
What limitations may the FCC place on an amateur station if its signal causes
interference to domestic broadcast reception, assuming that the receiver(s) involved
are of good engineering design?
A. The amateur station must cease operation
B. The amateur station must cease operation on all frequencies below 30 MHz
C. The amateur station must cease operation on all frequencies above 30 MHz
D. The amateur station must avoid transmitting during certain hours on frequencies
that cause the interference
~~
E1B09 (C) [97.407]
Which amateur stations may be operated in RACES?
A. Only those club stations licensed to Amateur Extra class operators
B. Any FCC-licensed amateur station except a Technician class operator's station
C. Any FCC-licensed amateur station certified by the responsible civil defense
organization for the area served
D. Any FCC-licensed amateur station participating in the Military Affiliate Radio
System (MARS)
~~
E1B10 (A) [97.407]
What frequencies are authorized to an amateur station participating in RACES?
A. All amateur service frequencies authorized to the control operator
B. Specific segments in the amateur service MF, HF, VHF and UHF bands
C. Specific local government channels
D. Military Affiliate Radio System (MARS) channels
~~
E1B11 (A) [97.307]
What is the permitted mean power of any spurious emission relative to the mean power
of the fundamental emission from a station transmitter or external RF amplifier
installed after January 1, 2003, and transmitting on a frequency below 30 MHZ?
A. At least 43 dB below
B. At least 53 dB below
C. At least 63 dB below
D. At least 73 dB below
~~
E1B12 (B) [97.307]
What is the highest modulation index permitted at the highest modulation frequency
for angle modulation?
A. .5
B. 1.0
C. 2.0
D. 3.0
~~
E1C Station Control: Definitions and restrictions pertaining to local, automatic and
remote control operation; control operator responsibilities for remote and
automatically controlled stations
E1C01 (D) [97.3]
What is a remotely controlled station?
A. A station operated away from its regular home location
B. A station controlled by someone other than the licensee
C. A station operating under automatic control
D. A station controlled indirectly through a control link
~~
E1C02 (A) [97.3, 97.109]
What is meant by automatic control of a station?
A. The use of devices and procedures for control so that the control operator does
not have to be present at a control point
B. A station operating with its output power controlled automatically
C. Remotely controlling a station’s antenna pattern through a directional control
link
D. The use of a control link between a control point and a locally controlled station
~~
E1C03 (B) [97.3, 97.109]
How do the control operator responsibilities of a station under automatic control
differ from one under local control?
A. Under local control there is no control operator
B. Under automatic control the control operator is not required to be present at the
control point
C. Under automatic control there is no control operator
D. Under local control a control operator is not required to be present at a control
point
~~
E1C04 (B) [97.109]
When may an automatically controlled station retransmit third party communications?
A. Never
B. Only when transmitting RTTY or data emissions
C. When specifically agreed upon by the sending and receiving stations
D. When approved by the National Telecommunication and Information Administration
~~
E1C05 (A) [97.109]
When may an automatically controlled station originate third party communications?
A. Never
B. Only when transmitting an RTTY or data emissions
C. When specifically agreed upon by the sending and receiving stations
D. When approved by the National Telecommunication and Information Administration
~~
E1C06 (C) [97.109]
Which of the following statements concerning remotely controlled amateur stations is
true?
A. Only Extra Class operators may be the control operator of a remote station
B. A control operator need not be present at the control point
C. A control operator must be present at the control point
D. Repeater and auxiliary stations may not be remotely controlled
~~
E1C07 (C) [97.3]
What is meant by local control?
A. Controlling a station through a local auxiliary link
B. Automatically manipulating local station controls
C. Direct manipulation of the transmitter by a control operator
D. Controlling a repeater using a portable handheld transceiver
~~
E1C08 (B) [97.213]
What is the maximum permissible duration of a remotely controlled station’s
transmissions if its control link malfunctions?
A. 30 seconds
B. 3 minutes
C. 5 minutes
D. 10 minutes
~~
E1C09 (D) [97.205]
Which of these frequencies are available for an automatically controlled repeater
operating below 30 MHz?
A. 18.110 - 18.168 MHz
B. 24.940 - 24.990 MHz
C. 10.100 - 10.150 MHz
D. 29.500 - 29.700 MHz
~~
E1C10 (B) [97.113]
What types of amateur stations may automatically retransmit the radio signals of
other amateur stations?
A. Only beacon, repeater or space stations
B. Only auxiliary, repeater or space stations
C. Only earth stations, repeater stations or model craft
D. Only auxiliary, beacon or space stations
~~
E1D Amateur Satellite service: definitions and purpose; license requirements for
space stations; available frequencies and bands; telecommand and telemetry
operations; restrictions and special provisions; notification requirements
E1D01 (A) [97.3]
What is the definition of the term telemetry?
A. One-way transmission of measurements at a distance from the measuring instrument
B. Two-way radiotelephone transmissions in excess of 1000 feet
C. Two-way single channel transmissions of data
D. One-way transmission that initiates, modifies, or terminates the functions of a
device at a distance
~~
E1D02 (C) [97.3]
What is the amateur satellite service?
A. A radio navigation service using satellites for the purpose of self training,
intercommunication and technical studies carried out by amateurs
B. A spacecraft launching service for amateur-built satellites
C. A radio communications service using amateur radio stations on satellites
D. A radio communications service using stations on Earth satellites for public
service broadcast
~~
E1D03 (B) [97.3]
What is a telecommand station in the amateur satellite service?
A. An amateur station located on the Earth’s surface for communications with other
Earth stations by means of Earth satellites
B. An amateur station that transmits communications to initiate, modify or terminate
functions of a space station
C. An amateur station located more than 50 km above the Earth’s surface
D. An amateur station that transmits telemetry consisting of measurements of upper
atmosphere data from space
~~
E1D04 (A) [97.3]
What is an Earth station in the amateur satellite service?
A. An amateur station within 50 km of the Earth's surface intended for communications
with amateur stations by means of objects in space
B. An amateur station that is not able to communicate using amateur satellites
C. An amateur station that transmits telemetry consisting of measurement of upper
atmosphere data from space
D. Any amateur station on the surface of the Earth
~~
E1D05 (C) [97.207]
What class of licensee is authorized to be the control operator of a space station?
A. All except Technician Class
B. Only General, Advanced or Amateur Extra Class
C. All classes
D. Only Amateur Extra Class
~~
E1D06 (A) [97.207]
Which of the following special provisions must a space station incorporate in order
to comply with space station requirements?
A. The space station must be capable of terminating transmissions by telecommand when
directed by the FCC
B. The space station must cease all transmissions after 5 years
C. The space station must be capable of changing its orbit whenever such a change is
ordered by NASA
D. All of these choices are correct
~~
E1D07 (A) [97.207]
Which amateur service HF bands have frequencies authorized to space stations?
A. Only 40m, 20m, 17m, 15m, 12m and 10m
B. Only 40m, 20m, 17m, 15m and 10m bands
C. 40m, 30m, 20m, 15m, 12m and 10m bands
D. All HF bands
~~
E1D08 (D) [97.207]
Which VHF amateur service bands have frequencies available for space stations?
A. 6 meters and 2 meters
B. 6 meters, 2 meters, and 1.25 meters
C. 2 meters and 1.25 meters
D. 2 meters
~~
E1D09
Which
A. 70
B. 70
C. 70
D. 33
~~
(B) [97.207]
amateur service UHF bands have frequencies available for a space station?
cm
cm, 23 cm, 13 cm
cm and 33 cm
cm and 13 cm
E1D10 (B) [97.211]
Which amateur stations are eligible to be telecommand stations?
A. Any amateur station designated by NASA
B. Any amateur station so designated by the space station licensee, subject to the
privileges of the class of operator license held by the control operator
C. Any amateur station so designated by the ITU
D. All of these choices are correct
~~
E1D11 (D) [97.209]
Which amateur stations are eligible to operate as Earth stations?
A. Any amateur station whose licensee has filed a pre-space notification with the
FCC’s International Bureau
B. Only those of General, Advanced or Amateur Extra Class operators
C. Only those of Amateur Extra Class operators
D. Any amateur station, subject to the privileges of the class of operator license
held by the control operator
~~
E1E Volunteer examiner program: definitions; qualifications; preparation and
administration of exams; accreditation; question pools; documentation requirements
E1E01 (D) [97.509]
What is the minimum number of qualified VEs required to administer an Element 4
amateur operator license examination?
A. 5
B. 2
C. 4
D. 3
~~
E1E02
Where
A. In
B. In
C. In
D. In
~~
(C) [97.523]
are the questions for all written US amateur license examinations listed?
FCC Part 97
a question pool maintained by the FCC
a question pool maintained by all the VECs
the appropriate FCC Report and Order
E1E03 (C) [97.521]
What is a Volunteer Examiner Coordinator?
A. A person who has volunteered to administer amateur operator license examinations
B. A person who has volunteered to prepare amateur operator license examinations
C. An organization that has entered into an agreement with the FCC to coordinate
amateur operator license examinations
D. The person who has entered into an agreement with the FCC to be the VE session
manager
~~
E1E04 (D) [97.509, 97.525]
Which of the following best describes the Volunteer Examiner accreditation process?
A. Each General, Advanced and Amateur Extra Class operator is automatically
accredited as a VE when the license is granted
B. The amateur operator applying must pass a VE examination administered by the FCC
Enforcement Bureau
C. The prospective VE obtains accreditation from the FCC
D. The procedure by which a VEC confirms that the VE applicant meets FCC requirements
to serve as an examiner
~~
E1E05 (B) [97.503]
What is the minimum passing
A. Minimum passing score of
B. Minimum passing score of
C. Minimum passing score of
D. Minimum passing score of
~~
score on amateur operator license examinations?
70%
74%
80%
77%
E1E06 (C) [97.509]
Who is responsible for the proper conduct and necessary supervision during an amateur
operator license examination session?
A. The VEC coordinating the session
B. The FCC
C. Each administering VE
D. The VE session manager
~~
E1E07 (B) [97.509]
What should a VE do if a candidate fails to comply with the examiner’s instructions
during an amateur operator license examination?
A. Warn the candidate that continued failure to comply will result in termination of
the examination
B. Immediately terminate the candidate’s examination
C. Allow the candidate to complete the examination, but invalidate the results
D. Immediately terminate everyone’s examination and close the session
~~
E1E08 (C) [97.509]
To which of the following examinees may a VE not administer an examination?
A. Employees of the VE
B. Friends of the VE
C. Relatives of the VE as listed in the FCC rules
D. All of these choices are correct
~~
E1E09 (A) [97.509]
What may be the penalty for a VE who fraudulently administers or certifies an
examination?
A. Revocation of the VE’s amateur station license grant and the suspension of the
VE’s amateur operator license grant
B. A fine of up to $1000 per occurrence
C. A sentence of up to one year in prison
D. All of these choices are correct
~~
E1E10 (C) [97.509]
What must the administering VEs do after the administration of a successful
examination for an amateur operator license?
A. They must collect and send the documents to the NCVEC for grading
B. They must collect and submit the documents to the coordinating VEC for grading
C. They must submit the application document to the coordinating VEC according to the
coordinating VEC instructions
D. They must collect and send the documents to the FCC according to instructions
~~
E1E11 (B) [97.509]
What must the VE team do if an examinee scores a passing grade on all examination
elements needed for an upgrade or new license?
A. Photocopy all examination documents and forward them to the FCC for processing
B. Three VEs must certify that the examinee is qualified for the license grant and
that they have complied with the administering VE requirements
C. Issue the examinee the new or upgrade license
D. All these choices are correct
~~
E1E12 (A) [97.509]
What must the VE team do with the application form if the examinee does not pass the
exam?
A. Return the application document to the examinee
B. Maintain the application form with the VEC’s records
C. Send the application form to the FCC and inform the FCC of the grade
D. Destroy the application form
~~
E1E13 (A) [97.519]
What are the consequences of failing to appear for re-administration of an
examination when so directed by the FCC?
A. The licensee's license will be cancelled
B. The person may be fined or imprisoned
C. The licensee is disqualified from any future examination for an amateur operator
license grant
D. All these choices are correct
~~
E1E14 (A) [97.527]
For which types of out-of-pocket expenses do the Part 97 rules state that VEs and
VECs may be reimbursed?
A. Preparing, processing, administering and coordinating an examination for an
amateur radio license
B. Teaching an amateur operator license examination preparation course
C. No expenses are authorized for reimbursement
D. Providing amateur operator license examination preparation training materials
~~
E1F Miscellaneous rules: external RF power amplifiers; national quiet zone; business
communications; compensated communications; spread spectrum; auxiliary stations;
reciprocal operating privileges; IARP and CEPT licenses; third party communications
with foreign countries; special temporary authority
E1F01 (B) [97.305]
On what frequencies are spread
A. Only on amateur frequencies
B. Only on amateur frequencies
C. Only on amateur frequencies
D. Only on amateur frequencies
~~
spectrum transmissions permitted?
above 50 MHz
above 222 MHz
above 420 MHz
above 144 MHz
E1F02 (A) [97.5]
Which of the following operating arrangements allows an FCC-licensed US citizen to
operate in many European countries, and alien amateurs from many European countries
to operate in the US?
A. CEPT agreement
B. IARP agreement
C. ITU reciprocal license
D. All of these choices are correct
~~
E1F03 (A) [97.315]
Under what circumstances may a dealer sell an external RF power amplifier capable of
operation below 144 MHz if it has not been granted FCC certification?
A. It was purchased in used condition from an amateur operator and is sold to another
amateur operator for use at that operator's station
B. The equipment dealer assembled it from a kit
C. It was imported from a manufacturer in a country that does not require
certification of RF power amplifiers
D. It was imported from a manufacturer in another country, and it was certificated by
that country’s government
~~
E1F04 (A) [97.3]
Which of the following geographic
A. A line roughly parallel to and
B. A line roughly parallel to and
C. A line roughly parallel to and
D. A line roughly parallel to and
~~
descriptions approximately describes "Line A"?
south of the US-Canadian border
west of the US Atlantic coastline
north of the US-Mexican border and Gulf coastline
east of the US Pacific coastline
E1F05 (D) [97.303]
Amateur stations may not transmit in which of the following frequency segments if
they are located in the contiguous 48 states and north of Line A?
A. 440 - 450 MHz
B. 53 - 54 MHz
C. 222 - 223 MHz
D. 420 - 430 MHz
~~
E1F06 (C) [97.3]
What is the National Radio Quiet Zone?
A. An area in Puerto Rico surrounding the Aricebo Radio Telescope
B. An area in New Mexico surrounding the White Sands Test Area
C. An area surrounding the National Radio Astronomy Observatory
D. An area in Florida surrounding Cape Canaveral
~~
E1F07 (D) [97.113]
When may an amateur station send a message to a business?
A. When the total money involved does not exceed $25
B. When the control operator is employed by the FCC or another government agency
C. When transmitting international third-party communications
D. When neither the amateur nor his or her employer has a pecuniary interest in the
communications
~~
E1F08 (A) [97.113]
Which of the following types of amateur station communications are prohibited?
A. Communications transmitted for hire or material compensation, except as otherwise
provided in the rules
B. Communications that have a political content, except as allowed by the Fairness
Doctrine
C. Communications that have a religious content
D. Communications in a language other than English
~~
E1F09 (D) [97.311]
Which of the following conditions apply when transmitting spread spectrum emission?
A. A station transmitting SS emission must not cause harmful interference to other
stations employing other authorized emissions
B. The transmitting station must be in an area regulated by the FCC or in a country
that permits SS emissions
C. The transmission must not be used to obscure the meaning of any communication
D. All of these choices are correct
~~
E1F10 (C) [97.313]
What is the maximum transmitter power for an amateur station transmitting spread
spectrum communications?
A. 1 W
B. 1.5 W
C. 10 W
D. 1.5 kW
~~
E1F11 (D) [97.317]
Which of the following best describes one of the standards that must be met by an
external RF power amplifier if it is to qualify for a grant of FCC certification?
A. It must produce full legal output when driven by not more than 5 watts of mean RF
input power
B. It must be capable of external RF switching between its input and output networks
C. It must exhibit a gain of 0 dB or less over its full output range
D. It must satisfy the FCC's spurious emission standards when operated at the lesser
of 1500 watts, or its full output power
~~
E1F12 (B) [97.201]
Who may be the control operator of an auxiliary station?
A. Any licensed amateur operator
B. Only Technician, General, Advanced or Amateur Extra Class operators
C. Only General, Advanced or Amateur Extra Class operators
D. Only Amateur Extra Class operators
~~
E1F13 (C) [97.117]
What types of communications may be transmitted to amateur stations in foreign
countries?
A. Business-related messages for non-profit organizations
B. Messages intended for connection to users of the maritime satellite service
C. Communications incidental to the purpose of the amateur service and remarks of a
personal nature
D. All of these choices are correct
~~
E1F14 (A) [1.931]
Under what circumstances might the FCC issue a "Special Temporary Authority" (STA) to
an amateur station?
A. To provide for experimental amateur communications
B. To allow regular operation on Land Mobile channels
C. To provide additional spectrum for personal use
D. To provide temporary operation while awaiting normal licensing
~~
SUBELEMENT E2 - OPERATING PROCEDURES [5 Exam Questions - 5 Groups]
E2A Amateur radio in space: amateur satellites; orbital mechanics; frequencies and
modes; satellite hardware; satellite operations
E2A01 (C)
What is the direction of an ascending pass for an amateur satellite?
A. From west to east
B. From east to west
C. From south to north
D. From north to south
~~
E2A02 (A)
What is the direction of a descending pass for an amateur satellite?
A. From north to south
B. From west to east
C. From east to west
D. From south to north
~~
E2A03 (C)
What is the orbital period of an Earth satellite?
A. The point of maximum height of a satellite's orbit
B. The point of minimum height of a satellite's orbit
C. The time it takes for a satellite to complete one revolution around the Earth
D. The time it takes for a satellite to travel from perigee to apogee
~~
E2A04 (B)
What is meant by the term mode as applied to an amateur radio satellite?
A. The type of signals that can be relayed through the satellite
B. The satellite's uplink and downlink frequency bands
C. The satellite's orientation with respect to the Earth
D. Whether the satellite is in a polar or equatorial orbit
~~
E2A05 (D)
What do the letters in a satellite's mode designator specify?
A. Power limits for uplink and downlink transmissions
B. The location of the ground control station
C. The polarization of uplink and downlink signals
D. The uplink and downlink frequency ranges
~~
E2A06 (A)
On what band would a satellite receive signals if it were operating in mode U/V?
A. 435-438 MHz
B. 144-146 MHz
C. 50.0-50.2 MHz
D. 29.5 to 29.7 MHz
~~
E2A07 (D)
Which of the following types of signals can be relayed through a linear transponder?
A. FM and CW
B. SSB and SSTV
C. PSK and Packet
D. All of these choices are correct
~~
E2A08 (B)
Why should effective radiated power to a satellite which uses a linear transponder be
limited?
A. To prevent creating errors in the satellite telemetry
B. To avoid reducing the downlink power to all other users
C. To prevent the satellite from emitting out of band signals
D. To avoid interfering with terrestrial QSOs
~~
E2A09 (A)
What do the terms L band and S band specify with regard to satellite communications?
A. The 23 centimeter and 13 centimeter bands
B. The 2 meter and 70 centimeter bands
C. FM and Digital Store-and-Forward systems
D. Which sideband to use
~~
E2A10 (A)
Why may the received signal from an amateur satellite exhibit a rapidly repeating
fading effect?
A. Because the satellite is spinning
B. Because of ionospheric absorption
C. Because of the satellite's low orbital altitude
D. Because of the Doppler Effect
~~
E2A11 (B)
What type of antenna can be used to minimize the effects of spin modulation and
Faraday rotation?
A. A linearly polarized antenna
B. A circularly polarized antenna
C. An isotropic antenna
D. A log-periodic dipole array
~~
E2A12 (D)
What is one way to predict the location of a satellite at a given time?
A. By means of the Doppler data for the specified satellite
B. By subtracting the mean anomaly from the orbital inclination
C. By adding the mean anomaly to the orbital inclination
D. By calculations using the Keplerian elements for the specified satellite
~~
E2A13 (B)
What type of satellite appears to stay in one position in the sky?
A. HEO
B. Geostationary
C. Geomagnetic
D. LEO
~~
E2B Television practices: fast scan television standards and techniques; slow scan
television standards and techniques
E2B01 (A)
How many times per second is a new frame transmitted in a fast-scan (NTSC) television
system?
A. 30
B. 60
C. 90
D. 120
~~
E2B02 (C)
How many horizontal lines make up a fast-scan (NTSC) television frame?
A. 30
B. 60
C. 525
D. 1080
~~
E2B03 (D)
How is an interlaced scanning pattern generated in a fast-scan (NTSC) television
system?
A. By scanning two fields simultaneously
B. By scanning each field from bottom to top
C. By scanning lines from left to right in one field and right to left in the next
D. By scanning odd numbered lines in one field and even numbered ones in the next
~~
E2B04 (B)
What is blanking in a video signal?
A. Synchronization of the horizontal and vertical sync pulses
B. Turning off the scanning beam while it is traveling from right to left or from
bottom to top
C. Turning off the scanning beam at the conclusion of a transmission
D. Transmitting a black and white test pattern
~~
E2B05 (C)
Which of the following is an advantage of using vestigial sideband for standard fastscan TV transmissions?
A. The vestigial sideband carries the audio information
B. The vestigial sideband contains chroma information
C. Vestigial sideband reduces bandwidth while allowing for simple video detector
circuitry
D. Vestigial sideband provides high frequency emphasis to sharpen the picture
~~
E2B06 (A)
What is vestigial sideband modulation?
A. Amplitude modulation in which one complete sideband and a portion of the other are
transmitted
B. A type of modulation in which one sideband is inverted
C. Narrow-band FM transmission achieved by filtering one sideband from the audio
before frequency modulating the carrier
D. Spread spectrum modulation achieved by applying FM modulation following single
sideband amplitude modulation
~~
E2B07 (B)
What is the name of the signal component that carries color information in NTSC
video?
A. Luminance
B. Chroma
C. Hue
D. Spectral Intensity
~~
E2B08 (D)
Which of the following is a common method of transmitting accompanying audio with
amateur fast-scan television?
A. Frequency-modulated sub-carrier
B. A separate VHF or UHF audio link
C. Frequency modulation of the video carrier
D. All of these choices are correct
~~
E2B09 (D)
What hardware, other than a receiver with SSB capability and a suitable computer, is
needed to decode SSTV using Digital Radio Mondiale (DRM)?
A. A special IF converter
B. A special front end limiter
C. A special notch filter to remove synchronization pulses
D. No other hardware is needed
~~
E2B10 (A)
Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM)
based voice or SSTV digital transmissions made on the HF amateur bands?
A. 3 KHz
B. 10 KHz
C. 15 KHz
D. 20 KHz
~~
E2B11 (B)
What is the function of the Vertical Interval Signaling (VIS) code transmitted as
part of an SSTV transmission?
A. To lock the color burst oscillator in color SSTV images
B. To identify the SSTV mode being used
C. To provide vertical synchronization
D. To identify the call sign of the station transmitting
~~
E2B12 (D)
How are analog SSTV images typically transmitted on the HF bands?
A. Video is converted to equivalent Baudot representation
B. Video is converted to equivalent ASCII representation
C. Varying tone frequencies representing the video are transmitted using PSK
D. Varying tone frequencies representing the video are transmitted using single
sideband
~~
E2B13 (C)
How many lines are commonly used in each frame on an amateur slow-scan color
television picture?
A. 30 to 60
B. 60 or 100
C. 128 or 256
D. 180 or 360
~~
E2B14 (A)
What aspect of an amateur slow-scan television signal encodes the brightness of the
picture?
A. Tone frequency
B. Tone amplitude
C. Sync amplitude
D. Sync frequency
~~
E2B15 (A)
What signals SSTV receiving equipment to begin a new picture line?
A. Specific tone frequencies
B. Elapsed time
C. Specific tone amplitudes
D. A two-tone signal
~~
E2B16 (D)
Which of the following is the video standard used by North American Fast Scan ATV
stations?
A. PAL
B. DRM
C. Scottie
D. NTSC
~~
E2B17 (B)
What is the approximate bandwidth of a slow-scan TV signal?
A. 600 Hz
B. 3 kHz
C. 2 MHz
D. 6 MHz
~~
E2B18 (D)
On which of the following frequencies is one likely to find FM ATV transmissions?
A. 14.230 MHz
B. 29.6 MHz
C. 52.525 MHz
D. 1255 MHz
~~
E2B19 (C)
What special operating frequency restrictions are imposed on slow scan TV
transmissions?
A. None; they are allowed on all amateur frequencies
B. They are restricted to 7.245 MHz, 14.245 MHz, 21.345, MHz, and 28.945 MHz
C. They are restricted to phone band segments and their bandwidth can be no greater
than that of a voice signal of the same modulation type
D. They are not permitted above 54 MHz
~~
E2C Operating methods: contest and DX operating; spread-spectrum transmissions;
selecting an operating frequency
E2C01 (A)
Which of the following is true about contest operating?
A. Operators are permitted to make contacts even if they do not submit a log
B. Interference to other amateurs is unavoidable and therefore acceptable
C. It is mandatory to transmit the call sign of the station being worked as part of
every transmission to that station
D. Every contest requires a signal report in the exchange
~~
E2C02 (A)
Which of the following best describes the term “self-spotting” in regards to contest
operating?
A. The generally prohibited practice of posting one’s own call sign and frequency on
a call sign spotting network
B. The acceptable practice of manually posting the call signs of stations on a call
sign spotting network
C. A manual technique for rapidly zero beating or tuning to a station’s frequency
before calling that station
D. An automatic method for rapidly zero beating or tuning to a station’s frequency
before calling that station
~~
E2C03 (A)
From which of the following bands is amateur radio contesting generally excluded?
A. 30 meters
B. 6 meters
C. 2 meters
D. 33 cm
~~
E2C04 (D)
On which of the following frequencies is an amateur radio contest contact generally
discouraged?
A. 3.525 MHz
B. 14.020 MHz
C. 28.330 MHz
D. 146.52 MHz
~~
E2C05 (B)
What is the function of a DX QSL Manager?
A. To allocate frequencies for DXpeditions
B. To handle the receiving and sending of confirmation cards for a DX station
C. To run a net to allow many stations to contact a rare DX station
D. To relay calls to and from a DX station
~~
E2C06 (C)
During a VHF/UHF contest, in which band segment would you expect to find the highest
level of activity?
A. At the top of each band, usually in a segment reserved for contests
B. In the middle of each band, usually on the national calling frequency
C. In the weak signal segment of the band, with most of the activity near the calling
frequency
D. In the middle of the band, usually 25 kHz above the national calling frequency
~~
E2C07 (A)
What is the Cabrillo format?
A. A standard for submission of electronic contest logs
B. A method of exchanging information during a contest QSO
C. The most common set of contest rules
D. The rules of order for meetings between contest sponsors
~~
E2C08 (A)
Why are received spread-spectrum signals resistant to interference?
A. Signals not using the spectrum-spreading algorithm are suppressed in the receiver
B. The high power used by a spread-spectrum transmitter keeps its signal from being
easily overpowered
C. The receiver is always equipped with a digital blanker circuit
D. If interference is detected by the receiver it will signal the transmitter to
change frequencies
~~
E2C09 (D)
How does the spread-spectrum technique of frequency hopping work?
A. If interference is detected by the receiver it will signal the transmitter to
change frequencies
B. If interference is detected by the receiver it will signal the transmitter to wait
until the frequency is clear
C. A pseudo-random binary bit stream is used to shift the phase of an RF carrier very
rapidly in a particular sequence
D. The frequency of the transmitted signal is changed very rapidly according to a
particular sequence also used by the receiving station
~~
E2C10 (D)
Why might a DX station state that they are listening on another frequency?
A. Because the DX station may be transmitting on a frequency that is prohibited to
some responding stations
B. To separate the calling stations from the DX station
C. To reduce interference, thereby improving operating efficiency
D. All of these choices are correct
~~
E2C11 (A)
How should you generally identify your station when attempting to contact a DX
station working a pileup or in a contest?
A. Send your full call sign once or twice
B. Send only the last two letters of your call sign until you make contact
C. Send your full call sign and grid square
D. Send the call sign of the DX station three times, the words this is, then your
call sign three times
~~
E2C12 (B)
What might help to restore contact when DX signals become too weak to copy across an
entire HF band a few hours after sunset?
A. Switch to a higher frequency HF band
B. Switch to a lower frequency HF band
C. Wait 90 minutes or so for the signal degradation to pass
D. Wait 24 hours before attempting another communication on the band
~~
E2D Operating methods: VHF and UHF digital modes; APRS
E2D01 (B)
Which of the following digital modes is especially designed for use for meteor
scatter signals?
A. WSPR
B. FSK441
C. Hellschreiber
D. APRS
~~
E2D02 (A)
What is the definition of baud?
A. The number of data symbols transmitted per second
B. The number of characters transmitted per second
C. The number of characters transmitted per minute
D. The number of words transmitted per minute
~~
E2D03 (D)
Which of the following digital modes is especially useful for EME communications?
A. FSK441
B. PACTOR III
C. Olivia
D. JT65
~~
E2D04 (C)
What is the purpose of digital store-and-forward functions on an Amateur Radio
satellite?
A. To upload operational software for the transponder
B. To delay download of telemetry between satellites
C. To store digital messages in the satellite for later download by other stations
D. To relay messages between satellites
~~
E2D05 (B)
Which of the following techniques is normally used by low Earth orbiting digital
satellites to relay messages around the world?
A. Digipeating
B. Store-and-forward
C. Multi-satellite relaying
D. Node hopping
~~
E2D06 (A)
Which of the following is a commonly used 2-meter APRS frequency?
A. 144.39 MHz
B. 144.20 MHz
C. 145.02 MHz
D. 146.52 MHz
~~
E2D07 (C)
Which of the following digital protocols is used by APRS?
A. PACTOR
B. 802.11
C. AX.25
D. AMTOR
~~
E2D08 (A)
Which of the following types of packet frames is used to transmit APRS beacon data?
A. Unnumbered Information
B. Disconnect
C. Acknowledgement
D. Connect
~~
E2D09 (D)
Under clear communications conditions, which of these digital communications modes
has the fastest data throughput?
A. AMTOR
B. 170-Hz shift, 45 baud RTTY
C. PSK31
D. 300-baud packet
~~
E2D10 (C)
How can an APRS station be used to help support a public service communications
activity?
A. An APRS station with an emergency medical technician can automatically transmit
medical data to the nearest hospital
B. APRS stations with General Personnel Scanners can automatically relay the
participant numbers and time as they pass the check points
C. An APRS station with a GPS unit can automatically transmit information to show a
mobile station's position during the event
D. All of these choices are correct
~~
E2D11 (D)
Which of the following data are used by the APRS network communicate your location?
A. Polar coordinates
B. Time and frequency
C. Radio direction finding LOPs
D. Latitude and longitude
~~
E2D12 (A)
How does JT65 improve EME communications?
A. It can decode signals many dB below the noise floor using FEC
B. It controls the receiver to track Doppler shift
C. It supplies signals to guide the antenna to track the Moon
D. All of these choices are correct
~~
E2E Operating methods: operating HF digital modes; error correction
E2E01 (B)
Which type of modulation is common for data emissions below 30 MHz?
A. DTMF tones modulating an FM signal
B. FSK
C. Pulse modulation
D. Spread spectrum
~~
E2E02 (A)
What do the letters FEC mean as they relate to digital operation?
A. Forward Error Correction
B. First Error Correction
C. Fatal Error Correction
D. Final Error Correction
~~
E2E03 (C)
How is Forward Error Correction implemented?
A. By the receiving station repeating each block of three data characters
B. By transmitting a special algorithm to the receiving station along with the data
characters
C. By transmitting extra data that may be used to detect and correct transmission
errors
D. By varying the frequency shift of the transmitted signal according to a predefined
algorithm
~~
E2E04 (A)
What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly
disappears?
A. Selective fading has occurred
B. One of the signal filters has saturated
C. The receiver has drifted 5 kHz from the desired receive frequency
D. The mark and space signal have been inverted
~~
E2E05 (D)
How does ARQ accomplish error correction?
A. Special binary codes provide automatic correction
B. Special polynomial codes provide automatic correction
C. If errors are detected, redundant data is substituted
D. If errors are detected, a retransmission is requested
~~
E2E06 (C)
What is the most common data rate used for HF packet communications?
A. 48 baud
B. 110 baud
C. 300 baud
D. 1200 baud
~~
E2E07 (B)
What is the typical bandwidth of a properly modulated MFSK16 signal?
A. 31 Hz
B. 316 Hz
C. 550 Hz
D. 2.16 kHz
~~
E2E08 (B)
Which of the following HF digital modes can be used to transfer binary files?
A. Hellschreiber
B. PACTOR
C. RTTY
D. AMTOR
~~
E2E09 (D)
Which of the following HF digital modes uses variable-length coding for bandwidth
efficiency?
A. RTTY
B. PACTOR
C. MT63
D. PSK31
~~
E2E10 (C)
Which of these digital communications modes has the narrowest bandwidth?
A. MFSK16
B. 170-Hz shift, 45 baud RTTY
C. PSK31
D. 300-baud packet
~~
E2E11 (A)
What is the difference between direct FSK and audio FSK?
A. Direct FSK applies the data signal to the transmitter VFO
B. Audio FSK has a superior frequency response
C. Direct FSK uses a DC-coupled data connection
D. Audio FSK can be performed anywhere in the transmit chain
~~
E2E12 (A)
Which type of digital communication does not support keyboard-to-keyboard operation?
A. Winlink
B. RTTY
C. PSK31
D. MFSK
~~
SUBELEMENT E3 - RADIO WAVE PROPAGATION [3 Exam Questions - 3 Groups]
E3A Propagation and technique: Earth-Moon-Earth communications (EME), meteor scatter
E3A01 (D)
What is the approximate maximum separation measured along the surface of the Earth
between two stations communicating by Moon bounce?
A. 500 miles, if the Moon is at perigee
B. 2000 miles, if the Moon is at apogee
C. 5000 miles, if the Moon is at perigee
D. 12,000 miles, as long as both can “see” the Moon
~~
E3A02 (B)
What characterizes libration fading of an Earth-Moon-Earth signal?
A. A slow change in the pitch of the CW signal
B. A fluttery irregular fading
C. A gradual loss of signal as the Sun rises
D. The returning echo is several Hertz lower in frequency than the transmitted signal
~~
E3A03 (A)
When scheduling EME contacts, which of these conditions will generally result in the
least path loss?
A. When the Moon is at perigee
B. When the Moon is full
C. When the Moon is at apogee
D. When the MUF is above 30 MHz
~~
E3A04 (D)
What type of
A. Equipment
B. Equipment
C. Equipment
D. Equipment
~~
receiving
with very
with very
with very
with very
system is desirable for EME communications?
wide bandwidth
low dynamic range
low gain
low noise figures
E3A05 (A)
Which of the following describes a method of establishing EME contacts?
A. Time synchronous transmissions with each station alternating
B. Storing and forwarding digital messages
C. Judging optimum transmission times by monitoring beacons from the Moon
D. High speed CW identification to avoid fading
~~
E3A06 (B)
What frequency range
A. 144.000 - 144.001
B. 144.000 - 144.100
C. 144.100 - 144.300
D. 145.000 - 145.100
~~
would you normally tune to find EME signals in the 2 meter band?
MHz
MHz
MHz
MHz
E3A07 (D)
What frequency range
A. 430.000 - 430.150
B. 430.100 - 431.100
C. 431.100 - 431.200
D. 432.000 - 432.100
~~
would you normally tune to find EME signals in the 70 cm band?
MHz
MHz
MHz
MHz
E3A08 (A)
When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons
is formed at what layer of the ionosphere?
A. The E layer
B. The F1 layer
C. The F2 layer
D. The D layer
~~
E3A09 (C)
Which of the following frequency ranges is well suited for meteor-scatter
communications?
A. 1.8 - 1.9 MHz
B. 10 - 14 MHz
C. 28 - 148 MHz
D. 220 - 450 MHz
~~
E3A10 (D)
Which of the following is a good technique for making meteor-scatter contacts?
A. 15 second timed transmission sequences with stations alternating based on location
B. Use of high speed CW or digital modes
C. Short transmission with rapidly repeated call signs and signal reports
D. All of these choices are correct
~~
E3B Propagation and technique: trans-equatorial, long path, gray-line; multi-path
propagation
E3B01 (A)
What is transequatorial propagation?
A. Propagation between two mid-latitude points at approximately the same distance
north and south of the magnetic equator
B. Propagation between any two points located on the magnetic equator
C. Propagation between two continents by way of ducts along the magnetic equator
D. Propagation between two stations at the same latitude
~~
E3B02 (C)
What is the approximate maximum range for signals using transequatorial propagation?
A. 1000 miles
B. 2500 miles
C. 5000 miles
D. 7500 miles
~~
E3B03 (C)
What is the best time of day for transequatorial propagation?
A. Morning
B. Noon
C. Afternoon or early evening
D. Late at night
~~
E3B04 (A)
What type of propagation is probably occurring if an HF beam antenna must be pointed
in a direction 180 degrees away from a station to receive the strongest signals?
A. Long-path
B. Sporadic-E
C. Transequatorial
D. Auroral
~~
E3B05 (C)
Which amateur bands typically support long-path propagation?
A. 160 to 40 meters
B. 30 to 10 meters
C. 160 to 10 meters
D. 6 meters to 2 meters
~~
E3B06 (B)
Which of the following amateur bands most frequently provides long-path propagation?
A. 80 meters
B. 20 meters
C. 10 meters
D. 6 meters
~~
E3B07 (D)
Which of the following could account for hearing an echo on the received signal of a
distant station?
A. High D layer absorption
B. Meteor scatter
C. Transmit frequency is higher than the MUF
D. Receipt of a signal by more than one path
~~
E3B08 (D)
What type of HF propagation is probably occurring if radio signals travel along the
terminator between daylight and darkness?
A. Transequatorial
B. Sporadic-E
C. Long-path
D. Gray-line
~~
E3B09 (A)
At what time of day is gray-line propagation most likely to occur?
A. At sunrise and sunset
B. When the Sun is directly above the location of the transmitting station
C. When the Sun is directly overhead at the middle of the communications path between
the two stations
D. When the Sun is directly above the location of the receiving station
~~
E3B10 (B)
What is the cause of gray-line propagation?
A. At midday, the Sun being directly overhead superheats the ionosphere causing
increased refraction of radio waves
B. At twilight, D-layer absorption drops while E-layer and F-layer propagation remain
strong
C. In darkness, solar absorption drops greatly while atmospheric ionization remains
steady
D. At mid afternoon, the Sun heats the ionosphere decreasing radio wave refraction
and the MUF
~~
E3B11 (C)
Which of the following describes gray-line propagation?
A. Backscatter contacts on the 10 meter band
B. Over the horizon propagation on the 6 and 2 meter bands
C. Long distance communications at twilight on frequencies less than 15 MHz
D. Tropospheric propagation on the 2 meter and 70 centimeter bands
~~
E3C Propagation and technique: Aurora propagation selective fading; radio-path
horizon; take-off angle over flat or sloping terrain; effects of ground on
propagation; less common propagation modes
E3C01 (D)
Which of the following effects does Aurora activity have on radio communications?
A. SSB signals are raspy
B. Signals propagating through the Aurora are fluttery
C. CW signals appear to be modulated by white noise
D. All of these choices are correct
~~
E3C02 (C)
What is the cause of Aurora activity?
A. The interaction between the solar wind and the Van Allen belt
B. A low sunspot level combined with tropospheric ducting
C. The interaction of charged particles from the Sun with the Earth’s magnetic field
and the ionosphere
D. Meteor showers concentrated in the northern latitudes
~~
E3C03
Where
A. In
B. In
C. In
D. In
~~
(D)
in the ionosphere does Aurora activity occur?
the F1-region
the F2-region
the D-region
the E-region
E3C04 (A)
Which emission mode is best for Aurora propagation?
A. CW
B. SSB
C. FM
D. RTTY
~~
E3C05 (B)
Which of the following describes selective fading?
A. Variability of signal strength with beam heading
B. Partial cancellation of some frequencies within the received pass band
C. Sideband inversion within the ionosphere
D. Degradation of signal strength due to backscatter
~~
E3C06 (A)
By how much does the VHF/UHF radio-path horizon distance exceed the geometric
horizon?
A. By approximately 15% of the distance
B. By approximately twice the distance
C. By approximately one-half the distance
D. By approximately four times the distance
~~
E3C07 (B)
How does the radiation pattern of a horizontally polarized 3-element beam antenna
vary with its height above ground?
A. The main lobe takeoff angle increases with increasing height
B. The main lobe takeoff angle decreases with increasing height
C. The horizontal beam width increases with height
D. The horizontal beam width decreases with height
~~
E3C08 (B)
What is the name of the high-angle wave in HF propagation that travels for some
distance within the F2 region?
A. Oblique-angle ray
B. Pedersen ray
C. Ordinary ray
D. Heaviside ray
~~
E3C09 (C)
Which of the following is usually responsible for causing VHF signals to propagate
for hundreds of miles?
A. D-region absorption
B. Faraday rotation
C. Tropospheric ducting
D. Ground wave
~~
E3C10 (B)
How does the performance of a horizontally polarized antenna mounted on the side of a
hill compare with the same antenna mounted on flat ground?
A. The main lobe takeoff angle increases in the downhill direction
B. The main lobe takeoff angle decreases in the downhill direction
C. The horizontal beam width decreases in the downhill direction
D. The horizontal beam width increases in the uphill direction
~~
E3C11 (B)
From the contiguous 48 states, in which approximate direction should an antenna be
pointed to take maximum advantage of aurora propagation?
A. South
B. North
C. East
D. West
~~
E3C12 (C)
How does the maximum distance of ground-wave propagation change when the signal
frequency is increased?
A. It stays the same
B. It increases
C. It decreases
D. It peaks at roughly 14 MHz
~~
E3C13 (A)
What type of polarization is best for ground-wave propagation?
A. Vertical
B. Horizontal
C. Circular
D. Elliptical
~~
E3C14 (D)
Why does the radio-path horizon distance exceed the geometric horizon?
A. E-region skip
B. D-region skip
C. Downward bending due to aurora refraction
D. Downward bending due to density variations in the atmosphere
~~
SUBELEMENT E4 - AMATEUR PRACTICES [5 Exam Questions - 5 Groups]
E4A Test equipment: analog and digital instruments; spectrum and network analyzers,
antenna analyzers; oscilloscopes; testing transistors; RF measurements
E4A01 (C)
How does a spectrum analyzer differ from an oscilloscope?
A. A spectrum analyzer measures ionospheric reflection; an oscilloscope displays
electrical signals
B. A spectrum analyzer displays the peak amplitude of signals; an oscilloscope
displays the average amplitude of signals
C. A spectrum analyzer displays signals in the frequency domain; an oscilloscope
displays signals in the time domain
D. A spectrum analyzer displays radio frequencies; an oscilloscope displays audio
frequencies
~~
E4A02 (D)
Which of the following parameters would a spectrum analyzer display on the horizontal
axis?
A. SWR
B. Q
C. Time
D. Frequency
~~
E4A03 (A)
Which of the following parameters would a spectrum analyzer display on the vertical
axis?
A. Amplitude
B. Duration
C. SWR
D. Q
~~
E4A04 (A)
Which of the following test instruments is used to display spurious signals from a
radio transmitter?
A. A spectrum analyzer
B. A wattmeter
C. A logic analyzer
D. A time-domain reflectometer
~~
E4A05 (B)
Which of the following test instruments is used to display intermodulation distortion
products in an SSB transmission?
A. A wattmeter
B. A spectrum analyzer
C. A logic analyzer
D. A time-domain reflectometer
~~
E4A06 (D)
Which of the following could be determined with a spectrum analyzer?
A. The degree of isolation between the input and output ports of a 2 meter duplexer
B. Whether a crystal is operating on its fundamental or overtone frequency
C. The spectral output of a transmitter
D. All of these choices are correct
~~
E4A07 (B)
Which of the following is an advantage of using an antenna analyzer compared to an
SWR bridge to measure antenna SWR?
A. Antenna analyzers automatically tune your antenna for resonance
B. Antenna analyzers do not need an external RF source
C. Antenna analyzers display a time-varying representation of the modulation envelope
D. All of these choices are correct
~~
E4A08 (D)
Which of the following instruments would be best for measuring the SWR of a beam
antenna?
A. A spectrum analyzer
B. A Q meter
C. An ohmmeter
D. An antenna analyzer
~~
E4A09 (A)
Which of the following describes a good method for measuring the intermodulation
distortion of your own PSK signal?
A. Transmit into a dummy load, receive the signal on a second receiver, and feed the
audio into the sound card of a computer running an appropriate PSK program
B. Multiply the ALC level on the transmitter during a normal transmission by the
average power output
C. Use an RF voltmeter coupled to the transmitter output using appropriate isolation
to prevent damage to the meter
D. All of these choices are correct
~~
E4A10 (D)
Which of the following tests establishes that a silicon
biased on?
A. Measure base-to-emitter resistance with an ohmmeter;
6 to 7 ohms
B. Measure base-to-emitter resistance with an ohmmeter;
0.6 to 0.7 ohms
C. Measure base-to-emitter voltage with a voltmeter; it
6 to 7 volts
D. Measure base-to-emitter voltage with a voltmeter; it
0.6 to 0.7 volts
~~
NPN junction transistor is
it should be approximately
it should be approximately
should be approximately
should be approximately
E4A11 (B)
Which of these instruments could be used for detailed analysis of digital signals?
A. Dip meter
B. Oscilloscope
C. Ohmmeter
D. Q meter
~~
E4A12 (B)
Which of the following procedures is an important precaution to follow when
connecting a spectrum analyzer to a transmitter output?
A. Use high quality double shielded coaxial cables to reduce signal losses
B. Attenuate the transmitter output going to the spectrum analyzer
C. Match the antenna to the load
D. All of these choices are correct
~~
E4B Measurement techniques: Instrument accuracy and performance limitations; probes;
techniques to minimize errors; measurement of Q; instrument calibration
E4B01 (B)
Which of the following factors most affects the accuracy of a frequency counter?
A. Input attenuator accuracy
B. Time base accuracy
C. Decade divider accuracy
D. Temperature coefficient of the logic
~~
E4B02 (C)
What is an advantage of using a bridge circuit to measure impedance?
A. It provides an excellent match under all conditions
B. It is relatively immune to drift in the signal generator source
C. The measurement is based on obtaining a signal null, which can be done very
precisely
D. It can display results directly in Smith chart format
~~
E4B03 (C)
If a frequency counter with a specified accuracy of +/- 1.0 ppm reads 146,520,000 Hz,
what is the most the actual frequency being measured could differ from the reading?
A. 165.2 Hz
B. 14.652 kHz
C. 146.52 Hz
D. 1.4652 MHz
~~
E4B04 (A)
If a frequency counter with a specified accuracy of +/- 0.1 ppm reads 146,520,000 Hz,
what is the most the actual frequency being measured could differ from the reading?
A. 14.652 Hz
B. 0.1 MHz
C. 1.4652 Hz
D. 1.4652 kHz
~~
E4B05 (D)
If a frequency counter with a specified accuracy of +/- 10 ppm reads 146,520,000 Hz,
what is the most the actual frequency being measured could differ from the reading?
A. 146.52 Hz
B. 10 Hz
C. 146.52 kHz
D. 1465.20 Hz
~~
E4B06 (D)
How much power is being absorbed by the load when a directional power meter connected
between a transmitter and a terminating load reads 100 watts forward power and 25
watts reflected power?
A. 100 watts
B. 125 watts
C. 25 watts
D. 75 watts
~~
E4B07 (A)
Which of the following is good practice when using an oscilloscope probe?
A. Keep the signal ground connection of the probe as short as possible
B. Never use a high impedance probe to measure a low impedance circuit
C. Never use a DC-coupled probe to measure an AC circuit
D. All of these choices are correct
~~
E4B08 (C)
Which of the following is a characteristic of a good DC voltmeter?
A. High reluctance input
B. Low reluctance input
C. High impedance input
D. Low impedance input
~~
E4B09 (D)
What is indicated if the current reading on an RF ammeter placed in series with the
antenna feed line of a transmitter increases as the transmitter is tuned to
resonance?
A. There is possibly a short to ground in the feed line
B. The transmitter is not properly neutralized
C. There is an impedance mismatch between the antenna and feed line
D. There is more power going into the antenna
~~
E4B10 (B)
Which of the following describes a method to measure intermodulation distortion in an
SSB transmitter?
A. Modulate the transmitter with two non-harmonically related radio frequencies and
observe the RF output with a spectrum analyzer
B. Modulate the transmitter with two non-harmonically related audio frequencies and
observe the RF output with a spectrum analyzer
C. Modulate the transmitter with two harmonically related audio frequencies and
observe the RF output with a peak reading wattmeter
D. Modulate the transmitter with two harmonically related audio frequencies and
observe the RF output with a logic analyzer
~~
E4B11 (D)
How should a portable antenna analyzer be connected when measuring antenna resonance
and feed point impedance?
A. Loosely couple the analyzer near the antenna base
B. Connect the analyzer via a high-impedance transformer to the antenna
C. Connect the antenna and a dummy load to the analyzer
D. Connect the antenna feed line directly to the analyzer's connector
~~
E4B12 (A)
What is the significance of voltmeter sensitivity expressed in ohms per volt?
A. The full scale reading of the voltmeter multiplied by its ohms per volt rating
will provide the input impedance of the voltmeter
B. When used as a galvanometer, the reading in volts multiplied by the ohms/volt will
determine the power drawn by the device under test
C. When used as an ohmmeter, the reading in ohms divided by the ohms/volt will
determine the voltage applied to the circuit
D. When used as an ammeter, the full scale reading in amps divided by ohms/volt will
determine the size of shunt needed
~~
E4B13 (A)
How is the compensation of an oscilloscope probe typically adjusted?
A. A square wave is displayed and the probe is adjusted until the horizontal portions
of the displayed wave are as nearly flat as possible
B. A high frequency sine wave is displayed and the probe is adjusted for maximum
amplitude
C. A frequency standard is displayed and the probe is adjusted until the deflection
time is accurate
D. A DC voltage standard is displayed and the probe is adjusted until the displayed
voltage is accurate
~~
E4B14 (B)
What happens if a dip meter is too tightly coupled to a tuned circuit being checked?
A. Harmonics are generated
B. A less accurate reading results
C. Cross modulation occurs
D. Intermodulation distortion occurs
~~
E4B15 (C)
Which of the following can be used as a relative measurement of the Q for a seriestuned circuit?
A. The inductance to capacitance ratio
B. The frequency shift
C. The bandwidth of the circuit's frequency response
D. The resonant frequency of the circuit
~~
E4C Receiver performance characteristics: phase noise; capture effect; noise floor;
image rejection; MDS; signal-to-noise-ratio; selectivity
E4C01 (D)
What is an effect of excessive phase noise in the local oscillator section of a
receiver?
A. It limits the receiver’s ability to receive strong signals
B. It reduces receiver sensitivity
C. It decreases receiver third-order intermodulation distortion dynamic range
D. It can cause strong signals on nearby frequencies to interfere with reception of
weak signals
~~
E4C02 (A)
Which of the following portions of a receiver can be effective in eliminating image
signal interference?
A. A front-end filter or pre-selector
B. A narrow IF filter
C. A notch filter
D. A properly adjusted product detector
~~
E4C03 (C)
What is the term for the blocking of one FM phone signal by another, stronger FM
phone signal?
A. Desensitization
B. Cross-modulation interference
C. Capture effect
D. Frequency discrimination
~~
E4C04 (D)
What is the definition of the noise figure of a receiver?
A. The ratio of atmospheric noise to phase noise
B. The noise bandwidth in Hertz compared to the theoretical bandwidth of a resistive
network
C. The ratio of thermal noise to atmospheric noise
D. The ratio in dB of the noise generated by the receiver compared to the theoretical
minimum noise
~~
E4C05 (B)
What does a value of -174 dBm/Hz represent with regard to the noise floor of a
receiver?
A. The minimum detectable signal as a function of receive frequency
B. The theoretical noise at the input of a perfect receiver at room temperature
C. The noise figure of a 1 Hz bandwidth receiver
D. The galactic noise contribution to minimum detectable signal
~~
E4C06 (D)
A CW receiver with the AGC off has an equivalent input noise power density of -174
dBm/Hz. What would be the level of an unmodulated carrier input to this receiver
that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?
A. 174 dBm
B. -164 dBm
C. -155 dBm
D. -148 dBm
~~
E4C07 (B)
What does the MDS of a receiver represent?
A. The meter display sensitivity
B. The minimum discernible signal
C. The multiplex distortion stability
D. The maximum detectable spectrum
~~
E4C08 (B)
How might lowering the noise figure affect receiver performance?
A. It would reduce the signal to noise ratio
B. It would improve weak signal sensitivity
C. It would reduce bandwidth
D. It would increase bandwidth
~~
E4C09 (C)
Which of the following choices is a good reason for selecting a high frequency for
the design of the IF in a conventional HF or VHF communications receiver?
A. Fewer components in the receiver
B. Reduced drift
C. Easier for front-end circuitry to eliminate image responses
D. Improved receiver noise figure
~~
E4C10 (B)
Which of the following is a desirable amount of selectivity for an amateur RTTY HF
receiver?
A. 100 Hz
B. 300 Hz
C. 6000 Hz
D. 2400 Hz
~~
E4C11 (B)
Which of the following is a desirable amount of selectivity for an amateur SSB phone
receiver?
A. 1 kHz
B. 2.4 kHz
C. 4.2 kHz
D. 4.8 kHz
~~
E4C12 (D)
What is an undesirable effect of using too wide a filter bandwidth in the IF section
of a receiver?
A. Output-offset overshoot
B. Filter ringing
C. Thermal-noise distortion
D. Undesired signals may be heard
~~
E4C13 (C)
How does a narrow-band roofing filter affect receiver performance?
A. It improves sensitivity by reducing front end noise
B. It improves intelligibility by using low Q circuitry to reduce ringing
C. It improves dynamic range by attenuating strong signals near the receive frequency
D. All of these choices are correct
~~
E4C14 (D)
On which of the following frequencies might a signal be transmitting which is
generating a spurious image signal in a receiver tuned to 14.300 MHz and which uses a
455 kHz IF frequency?
A. 13.845 MHz
B. 14.755 MHz
C. 14.445 MHz
D. 15.210 MHz
~~
E4C15 (D)
What is the primary source of noise that can be heard from an HF receiver with an
antenna connected?
A. Detector noise
B. Induction motor noise
C. Receiver front-end noise
D. Atmospheric noise
~~
E4D Receiver performance characteristics: blocking dynamic range; intermodulation and
cross-modulation interference; 3rd order intercept; desensitization; preselection
E4D01 (A)
What is meant by the blocking dynamic range of a receiver?
A. The difference in dB between the noise floor and the level of an incoming signal
which will cause 1 dB of gain compression
B. The minimum difference in dB between the levels of two FM signals which will cause
one signal to block the other
C. The difference in dB between the noise floor and the third order intercept point
D. The minimum difference in dB between two signals which produce third order
intermodulation products greater than the noise floor
~~
E4D02 (A)
Which of the following describes two problems caused by poor dynamic range in a
communications receiver?
A. Cross-modulation of the desired signal and desensitization from strong adjacent
signals
B. Oscillator instability requiring frequent retuning and loss of ability to recover
the opposite sideband
C. Cross-modulation of the desired signal and insufficient audio power to operate the
speaker
D. Oscillator instability and severe audio distortion of all but the strongest
received signals
~~
E4D03 (B)
How can intermodulation interference between two repeaters occur?
A. When the repeaters are in close proximity and the signals cause feedback in the
final amplifier of one or both transmitters
B. When the repeaters are in close proximity and the signals mix in the final
amplifier of one or both transmitters
C. When the signals from the transmitters are reflected out of phase from airplanes
passing overhead
D. When the signals from the transmitters are reflected in phase from airplanes
passing overhead
~~
E4D04 (B)
Which of the following may reduce or eliminate intermodulation interference in a
repeater caused by another transmitter operating in close proximity?
A. A band-pass filter in the feed line between the transmitter and receiver
B. A properly terminated circulator at the output of the transmitter
C. A Class C final amplifier
D. A Class D final amplifier
~~
E4D05 (A)
What transmitter frequencies would cause an intermodulation-product signal in a
receiver tuned to 146.70 MHz when a nearby station transmits on 146.52 MHz?
A. 146.34 MHz and 146.61 MHz
B. 146.88 MHz and 146.34 MHz
C. 146.10 MHz and 147.30 MHz
D. 173.35 MHz and 139.40 MHz
~~
E4D06 (D)
What is the term for unwanted signals generated by the mixing of two or more signals?
A. Amplifier desensitization
B. Neutralization
C. Adjacent channel interference
D. Intermodulation interference
~~
E4D07 (D)
Which of the following describes the most significant effect of an off-frequency
signal when it is causing cross-modulation interference to a desired signal?
A. A large increase in background noise
B. A reduction in apparent signal strength
C. The desired signal can no longer be heard
D. The off-frequency unwanted signal is heard in addition to the desired signal
~~
E4D08 (C)
What causes intermodulation in an electronic circuit?
A. Too little gain
B. Lack of neutralization
C. Nonlinear circuits or devices
D. Positive feedback
~~
E4D09 (C)
What is the purpose of the preselector in a communications receiver?
A. To store often-used frequencies
B. To provide a range of AGC time constants
C. To increase rejection of unwanted signals
D. To allow selection of the optimum RF amplifier device
~~
E4D10 (C)
What does a third-order intercept level of 40 dBm mean with respect to receiver
performance?
A. Signals less than 40 dBm will not generate audible third-order intermodulation
products
B. The receiver can tolerate signals up to 40 dB above the noise floor without
producing third-order intermodulation products
C. A pair of 40 dBm signals will theoretically generate a third-order intermodulation
product with the same level as the input signals
D. A pair of 1 mW input signals will produce a third-order intermodulation product
which is 40 dB stronger than the input signal
~~
E4D11 (A)
Why are third-order intermodulation products created within a receiver of particular
interest compared to other products?
A. The third-order product of two signals which are in the band of interest is also
likely to be within the band
B. The third-order intercept is much higher than other orders
C. Third-order products are an indication of poor image rejection
D. Third-order intermodulation produces three products for every input signal within
the band of interest
~~
E4D12 (A)
What is the term for the reduction in receiver sensitivity caused by a strong signal
near the received frequency?
A. Desensitization
B. Quieting
C. Cross-modulation interference
D. Squelch gain rollback
~~
E4D13 (B)
Which of the following can cause receiver desensitization?
A. Audio gain adjusted too low
B. Strong adjacent-channel signals
C. Audio bias adjusted too high
D. Squelch gain misadjusted
~~
E4D14 (A)
Which of the following is a way to reduce the likelihood of receiver desensitization?
A.
B.
C.
D.
~~
Decrease the RF bandwidth of the receiver
Raise the receiver IF frequency
Increase the receiver front end gain
Switch from fast AGC to slow AGC
E4E Noise suppression: system noise; electrical appliance noise; line noise; locating
noise sources; DSP noise reduction; noise blankers
E4E01 (A)
Which of the following types of receiver noise can often be reduced by use of a
receiver noise blanker?
A. Ignition noise
B. Broadband white noise
C. Heterodyne interference
D. All of these choices are correct
~~
E4E02 (D)
Which of the following types of receiver noise can often be reduced with a DSP noise
filter?
A. Broadband white noise
B. Ignition noise
C. Power line noise
D. All of these choices are correct
~~
E4E03 (B)
Which of the following signals might a receiver noise blanker be able to remove from
desired signals?
A. Signals which are constant at all IF levels
B. Signals which appear across a wide bandwidth
C. Signals which appear at one IF but not another
D. Signals which have a sharply peaked frequency distribution
~~
E4E04 (D)
How can conducted and radiated noise caused by an automobile alternator be
suppressed?
A. By installing filter capacitors in series with the DC power lead and by installing
a blocking capacitor in the field lead
B. By installing a noise suppression resistor and a blocking capacitor in both leads
C. By installing a high-pass filter in series with the radio's power lead and a lowpass filter in parallel with the field lead
D. By connecting the radio's power leads directly to the battery and by installing
coaxial capacitors in line with the alternator leads
~~
E4E05 (B)
How can noise from an electric motor be suppressed?
A. By installing a high pass filter in series with the motor’s power leads
B. By installing a brute-force AC-line filter in series with the motor leads
C. By installing a bypass capacitor in series with the motor leads
D. By using a ground-fault current interrupter in the circuit used to power the motor
~~
E4E06 (B)
What is a major cause of atmospheric static?
A. Solar radio frequency emissions
B. Thunderstorms
C. Geomagnetic storms
D. Meteor showers
~~
E4E07 (C)
How can you determine if line noise interference is being generated within your home?
A. By checking the power line voltage with a time domain reflectometer
B. By observing the AC power line waveform with an oscilloscope
C. By turning off the AC power line main circuit breaker and listening on a battery
operated radio
D. By observing the AC power line voltage with a spectrum analyzer
~~
E4E08 (A)
What type of signal is picked up by electrical wiring near a radio antenna?
A. A common-mode signal at the frequency of the radio transmitter
B. An electrical-sparking signal
C. A differential-mode signal at the AC power line frequency
D. Harmonics of the AC power line frequency
~~
E4E09 (C)
What undesirable effect can occur when using an IF noise blanker?
A. Received audio in the speech range might have an echo effect
B. The audio frequency bandwidth of the received signal might be compressed
C. Nearby signals may appear to be excessively wide even if they meet emission
standards
D. FM signals can no longer be demodulated
~~
E4E10 (D)
What is a common characteristic of interference caused by a touch controlled
electrical device?
A. The interfering signal sounds like AC hum on an AM receiver or a carrier modulated
by 60 Hz hum on a SSB or CW receiver
B. The interfering signal may drift slowly across the HF spectrum
C. The interfering signal can be several kHz in width and usually repeats at regular
intervals across a HF band
D. All of these choices are correct
~~
E4E11 (B)
Which of the following is the most likely cause if you are hearing combinations of
local AM broadcast signals within one or more of the MF or HF ham bands?
A. The broadcast station is transmitting an over-modulated signal
B. Nearby corroded metal joints are mixing and re-radiating the broadcast signals
C. You are receiving sky wave signals from a distant station
D. Your station receiver IF amplifier stage is defective
~~
E4E12 (A)
What is one disadvantage of using some types of automatic DSP notch-filters when
attempting to copy CW signals?
A. The DSP filter can remove the desired signal at the same time as it removes
interfering signals
B. Any nearby signal passing through the DSP system will overwhelm the desired signal
C. Received CW signals will appear to be modulated at the DSP clock frequency
D. Ringing in the DSP filter will completely remove the spaces between the CW
characters
~~
E4E13 (D)
What might be the cause of a loud roaring or buzzing AC line interference that comes
and goes at intervals?
A. Arcing contacts in a thermostatically controlled device
B. A defective doorbell or doorbell transformer inside a nearby residence
C. A malfunctioning illuminated advertising display
D. All of these choices are correct
~~
E4E14 (C)
What is one type of electrical interference that might be caused by the operation of
a nearby personal computer?
A. A loud AC hum in the audio output of your station receiver
B. A clicking noise at intervals of a few seconds
C. The appearance of unstable modulated or unmodulated signals at specific
frequencies
D. A whining type noise that continually pulses off and on
~~
SUBELEMENT E5 - ELECTRICAL PRINCIPLES [4 Exam Questions - 4 Groups]
E5A Resonance and Q: characteristics of resonant circuits; series and parallel
resonance; Q; half-power bandwidth; phase relationships in reactive circuits
E5A01 (A)
What can cause the voltage across reactances in series to be larger than the voltage
applied to them?
A. Resonance
B. Capacitance
C. Conductance
D. Resistance
~~
E5A02 (C)
What is resonance in an electrical circuit?
A. The highest frequency that will pass current
B. The lowest frequency that will pass current
C. The frequency at which the capacitive reactance equals the inductive reactance
D. The frequency at which the reactive impedance equals the resistive impedance
~~
E5A03 (D)
What is the magnitude of the impedance of a series RLC circuit at resonance?
A. High, as compared to the circuit resistance
B. Approximately equal to capacitive reactance
C. Approximately equal to inductive reactance
D. Approximately equal to circuit resistance
~~
E5A04 (A)
What is the magnitude of the impedance of a circuit with a resistor, an inductor and
a capacitor all in parallel, at resonance?
A. Approximately equal to circuit resistance
B. Approximately equal to inductive reactance
C. Low, as compared to the circuit resistance
D. Approximately equal to capacitive reactance
~~
E5A05 (B)
What is the magnitude of the current at the input of a series RLC circuit as the
frequency goes through resonance?
A. Minimum
B. Maximum
C. R/L
D. L/R
~~
E5A06 (B)
What is the magnitude of the circulating current within the components of a parallel
LC circuit at resonance?
A. It is at a minimum
B. It is at a maximum
C. It equals 1 divided by the quantity 2 times Pi, multiplied by the square root of
inductance L multiplied by capacitance C
D. It equals 2 multiplied by Pi, multiplied by frequency "F", multiplied by
inductance "L"
~~
E5A07 (A)
What is the magnitude of the current at the input of a parallel RLC circuit at
resonance?
A. Minimum
B. Maximum
C. R/L
D. L/R
~~
E5A08 (C)
What is the phase relationship between the current through and the voltage across a
series resonant circuit at resonance?
A. The voltage leads the current by 90 degrees
B. The current leads the voltage by 90 degrees
C. The voltage and current are in phase
D. The voltage and current are 180 degrees out of phase
~~
E5A09 (C)
What is the phase relationship between the current through and the voltage across a
parallel resonant circuit at resonance?
A. The voltage leads the current by 90 degrees
B. The current leads the voltage by 90 degrees
C. The voltage and current are in phase
D. The voltage and current are 180 degrees out of phase
~~
E5A10 (A)
What is the half-power bandwidth of a parallel resonant circuit that has a resonant
frequency of 1.8 MHz and a Q of 95?
A. 18.9 kHz
B. 1.89 kHz
C. 94.5 kHz
D. 9.45 kHz
~~
E5A11 (C)
What is the half-power bandwidth of a parallel resonant circuit that has a resonant
frequency of 7.1 MHz and a Q of 150?
A. 157.8 Hz
B. 315.6 Hz
C. 47.3 kHz
D. 23.67 kHz
~~
E5A12 (C)
What is the half-power bandwidth of a parallel resonant circuit that has a resonant
frequency of 3.7 MHz and a Q of 118?
A. 436.6 kHz
B. 218.3 kHz
C. 31.4 kHz
D. 15.7 kHz
~~
E5A13 (B)
What is the half-power bandwidth of a parallel resonant circuit that has a resonant
frequency of 14.25 MHz and a Q of 187?
A. 38.1 kHz
B. 76.2 kHz
C. 1.332 kHz
D. 2.665 kHz
~~
E5A14 (C)
What is the resonant frequency of a series RLC circuit if R is 22 ohms, L is 50
microhenrys and C is 40 picofarads?
A. 44.72 MHz
B. 22.36 MHz
C. 3.56 MHz
D. 1.78 MHz
~~
E5A15 (B)
What is the resonant frequency of a series RLC circuit if R is 56 ohms, L is 40
microhenrys and C is 200 picofarads?
A. 3.76 MHz
B. 1.78 MHz
C. 11.18 MHz
D. 22.36 MHz
~~
E5A16 (D)
What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50
microhenrys and C is 10 picofarads?
A. 23.5 MHz
B. 23.5 kHz
C. 7.12 kHz
D. 7.12 MHz
~~
E5A17 (A)
What is the resonant frequency of a parallel RLC circuit if R is 47 ohms, L is 25
microhenrys and C is 10 picofarads?
A. 10.1 MHz
B. 63.2 MHz
C. 10.1 kHz
D. 63.2 kHz
~~
E5B Time constants and phase relationships: RLC time constants; definition; time
constants in RL and RC circuits; phase angle between voltage and current; phase
angles of series and parallel circuits
E5B01 (B)
What is the term for the time required for the capacitor in an RC circuit to be
charged to 63.2% of the applied voltage?
A. An exponential rate of one
B. One time constant
C. One exponential period
D. A time factor of one
~~
E5B02 (D)
What is the term for the time it takes for a charged capacitor in an RC circuit to
discharge to 36.8% of its initial voltage?
A. One discharge period
B. An exponential discharge rate of one
C. A discharge factor of one
D. One time constant
~~
E5B03 (D)
The capacitor in an RC circuit is discharged to what percentage of the starting
voltage after two time constants?
A. 86.5%
B. 63.2%
C. 36.8%
D. 13.5%
~~
E5B04 (D)
What is the time constant of a circuit having two 220-microfarad capacitors and two
1-megohm resistors, all in parallel?
A. 55 seconds
B. 110 seconds
C. 440 seconds
D. 220 seconds
~~
E5B05 (A)
How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a
0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
A. 0.02 seconds
B. 0.04 seconds
C. 20 seconds
D. 40 seconds
~~
E5B06 (C)
How long does it take for an initial charge of 800 V DC to decrease to 294 V DC in a
450-microfarad capacitor when a 1-megohm resistor is connected across it?
A. 4.50 seconds
B. 9 seconds
C. 450 seconds
D. 900 seconds
~~
E5B07 (C)
What is the phase angle between the voltage across and the current through a series
RLC circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms?
A. 68.2 degrees with the voltage leading the current
B. 14.0 degrees with the voltage leading the current
C. 14.0 degrees with the voltage lagging the current
D. 68.2 degrees with the voltage lagging the current
~~
E5B08 (A)
What is the phase angle between the voltage across and the current through a series
RLC circuit if XC is 100 ohms, R is 100 ohms, and XL is 75 ohms?
A. 14 degrees with the voltage lagging the current
B. 14 degrees with the voltage leading the current
C. 76 degrees with the voltage leading the current
D. 76 degrees with the voltage lagging the current
~~
E5B09 (D)
What is the relationship between the current through a capacitor and the voltage
across a capacitor?
A. Voltage and current are in phase
B. Voltage and current are 180 degrees out of phase
C. Voltage leads current by 90 degrees
D. Current leads voltage by 90 degrees
~~
E5B10 (A)
What is the relationship between the current through an inductor and the voltage
across an inductor?
A. Voltage leads current by 90 degrees
B. Current leads voltage by 90 degrees
C. Voltage and current are 180 degrees out of phase
D. Voltage and current are in phase
~~
E5B11 (B)
What is the phase angle between the voltage across and the current through a series
RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?
A. 14 degrees with the voltage lagging the current
B. 14 degrees with the voltage leading the current
C. 76 degrees with the voltage lagging the current
D. 76 degrees with the voltage leading the current
~~
E5B12 (C)
What is the phase angle between the voltage across and the current through a series
RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 50 ohms?
A. 76 degrees with the voltage lagging the current
B. 14 degrees with the voltage leading the current
C. 14 degrees with the voltage lagging the current
D. 76 degrees with the voltage leading the current
~~
E5B13 (D)
What is the phase angle between the voltage across and the current through a series
RLC circuit if XC is 250 ohms, R is 1 kilohm, and XL is 500 ohms?
A. 81.47 degrees with the voltage lagging the current
B. 81.47 degrees with the voltage leading the current
C. 14.04 degrees with the voltage lagging the current
D. 14.04 degrees with the voltage leading the current
~~
E5C Impedance plots and coordinate systems: plotting impedances in polar coordinates;
rectangular coordinates
E5C01 (B)
In polar coordinates, what is the impedance of a network consisting of a 100-ohmreactance inductor in series with a 100-ohm resistor?
A. 121 ohms at an angle of 35 degrees
B. 141 ohms at an angle of 45 degrees
C. 161 ohms at an angle of 55 degrees
D. 181 ohms at an angle of 65 degrees
~~
E5C02 (D)
In polar coordinates, what is the impedance of a network consisting of a 100-ohmreactance inductor, a 100-ohm-reactance capacitor, and a 100-ohm resistor, all
connected in series?
A. 100 ohms at an angle of 90 degrees
B. 10 ohms at an angle of 0 degrees
C. 10 ohms at an angle of 90 degrees
D. 100 ohms at an angle of 0 degrees
~~
E5C03 (A)
In polar coordinates, what is the impedance of a network consisting of a 300-ohmreactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all
connected in series?
A. 500 ohms at an angle of 37 degrees
B. 900 ohms at an angle of 53 degrees
C. 400 ohms at an angle of 0 degrees
D. 1300 ohms at an angle of 180 degrees
~~
E5C04 (D)
In polar coordinates, what is the impedance of a network consisting of a 400-ohmreactance capacitor in series with a 300-ohm resistor?
A. 240 ohms at an angle of 36.9 degrees
B. 240 ohms at an angle of -36.9 degrees
C. 500 ohms at an angle of 53.1 degrees
D. 500 ohms at an angle of -53.1 degrees
~~
E5C05 (A)
In polar coordinates, what is the impedance of a network consisting of a 400-ohmreactance inductor in parallel with a 300-ohm resistor?
A. 240 ohms at an angle of 36.9 degrees
B. 240 ohms at an angle of -36.9 degrees
C. 500 ohms at an angle of 53.1 degrees
D. 500 ohms at an angle of -53.1 degrees
~~
E5C06 (D)
In polar coordinates, what is the impedance of a network consisting of a 100-ohmreactance capacitor in series with a 100-ohm resistor?
A. 121 ohms at an angle of -25 degrees
B. 191 ohms at an angle of -85 degrees
C. 161 ohms at an angle of -65 degrees
D. 141 ohms at an angle of -45 degrees
~~
E5C07 (C)
In polar coordinates, what is the impedance of a network comprised of a 100-ohmreactance capacitor in parallel with a 100-ohm resistor?
A. 31 ohms at an angle of -15 degrees
B. 51 ohms at an angle of -25 degrees
C. 71 ohms at an angle of -45 degrees
D. 91 ohms at an angle of -65 degrees
~~
E5C08 (B)
In polar coordinates, what is the impedance of a network comprised of a 300-ohmreactance inductor in series with a 400-ohm resistor?
A. 400 ohms at an angle of 27 degrees
B. 500 ohms at an angle of 37 degrees
C. 500 ohms at an angle of 47 degrees
D. 700 ohms at an angle of 57 degrees
~~
E5C09 (A)
When using rectangular coordinates to graph the impedance of a circuit, what does the
horizontal axis represent?
A. Resistive component
B. Reactive component
C. The sum of the reactive and resistive components
D. The difference between the resistive and reactive components
~~
E5C10 (B)
When using rectangular coordinates to graph the impedance of a circuit, what does the
vertical axis represent?
A. Resistive component
B. Reactive component
C. The sum of the reactive and resistive components
D. The difference between the resistive and reactive components
~~
E5C11 (C)
What do the two numbers represent that are used to define a point on a graph using
rectangular coordinates?
A. The magnitude and phase of the point
B. The sine and cosine values
C. The coordinate values along the horizontal and vertical axes
D. The tangent and cotangent values
~~
E5C12 (D)
If you plot the impedance of a circuit using the rectangular coordinate system and
find the impedance point falls on the right side of the graph on the horizontal axis,
what do you know about the circuit?
A. It has to be a direct current circuit
B. It contains resistance and capacitive reactance
C. It contains resistance and inductive reactance
D. It is equivalent to a pure resistance
~~
E5C13 (D)
What coordinate system is often used to display the resistive, inductive, and/or
capacitive reactance components of an impedance?
A. Maidenhead grid
B. Faraday grid
C. Elliptical coordinates
D. Rectangular coordinates
~~
E5C14 (D)
What coordinate system is often used to display the phase angle of a circuit
containing resistance, inductive and/or capacitive reactance?
A. Maidenhead grid
B. Faraday grid
C. Elliptical coordinates
D. Polar coordinates
~~
E5C15 (A)
In polar coordinates, what
A. 141 ohms at an angle of
B. 100 ohms at an angle of
C. 100 ohms at an angle of
D. 141 ohms at an angle of
~~
is the impedance of a circuit of 100 -j100 ohms impedance?
-45 degrees
45 degrees
-45 degrees
45 degrees
E5C16 (B)
In polar coordinates, what is the impedance of a circuit that has an admittance of
7.09 millisiemens at 45 degrees?
A. 5.03 E–06 ohms at an angle of 45 degrees
B. 141 ohms at an angle of -45 degrees
C. 19,900 ohms at an angle of -45 degrees
D. 141 ohms at an angle of 45 degrees
~~
E5C17 (C)
In rectangular coordinates, what is the impedance of a circuit that has an admittance
of 5 millisiemens at -30 degrees?
A. 173 -j100 ohms
B. 200 +j100 ohms
C. 173 +j100 ohms
D. 200 -j100 ohms
~~
E5C18 (B)
In polar coordinates, what is the impedance of a series circuit consisting of a
resistance of 4 ohms, an inductive reactance of 4 ohms, and a capacitive reactance of
1 ohm?
A. 6.4 ohms at an angle of 53 degrees
B. 5 ohms at an angle of 37 degrees
C. 5 ohms at an angle of 45 degrees
D. 10 ohms at an angle of -51 degrees
~~
E5C19 (B)
Which point on Figure E5-2 best represents that impedance of a series circuit
consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?
A. Point 2
B. Point 4
C. Point 5
D. Point 6
~~
E5C20 (B)
Which point in Figure E5-2 best represents the impedance of a series circuit
consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz?
A. Point 1
B. Point 3
C. Point 7
D. Point 8
~~
E5C21 (A)
Which point on Figure E5-2 best represents the impedance of a series circuit
consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?
A. Point 1
B. Point 3
C. Point 7
D. Point 8
~~
E5C22 (A)
In rectangular coordinates, what is the impedance of a network consisting of a 10microhenry inductor in series with a 40-ohm resistor at 500 MHz?
A. 40 + j31,400
B. 40 - j31,400
C. 31,400 + j40
D. 31,400 - j40
~~
E5C23 (D)
Which point on Figure E5-2 best represents the impedance of a series circuit
consisting of a 300-ohm resistor, a 0.64-microhenry inductor and an 85-picofarad
capacitor at 24.900 MHz?
A. Point 1
B. Point 3
C. Point 5
D. Point 8
~~
E5D AC and RF energy in real circuits: skin effect; electrostatic and electromagnetic
fields; reactive power; power factor; coordinate systems
E5D01 (A)
What is the result of skin effect?
A. As frequency increases, RF current flows in a thinner layer of the conductor,
closer to the surface
B. As frequency decreases, RF current flows in a thinner layer of the conductor,
closer to the surface
C. Thermal effects on the surface of the conductor increase the impedance
D. Thermal effects on the surface of the conductor decrease the impedance
~~
E5D02 (C)
Why is the
currents?
A. Because
B. Because
C. Because
D. Because
~~
resistance of a conductor different for RF currents than for direct
the insulation conducts current at high frequencies
of the Heisenburg Effect
of skin effect
conductors are non-linear devices
E5D03 (C)
What device is used to store electrical energy in an electrostatic field?
A. A battery
B. A transformer
C. A capacitor
D. An inductor
~~
E5D04 (B)
What unit measures electrical energy stored in an electrostatic field?
A. Coulomb
B. Joule
C. Watt
D. Volt
~~
E5D05 (B)
Which of the following creates a magnetic field?
A. Potential differences between two points in space
B. Electric current
C. A charged capacitor
D. A battery
~~
E5D06 (D)
In what direction is the magnetic field oriented about a conductor in relation to the
direction of electron flow?
A. In the same direction as the current
B. In a direction opposite to the current
C. In all directions; omnidirectional
D. In a direction determined by the left-hand rule
~~
E5D07 (D)
What determines the strength of a magnetic field around a conductor?
A. The resistance divided by the current
B. The ratio of the current to the resistance
C. The diameter of the conductor
D. The amount of current
~~
E5D08 (B)
What type of energy is stored in an electromagnetic or electrostatic field?
A. Electromechanical energy
B. Potential energy
C. Thermodynamic energy
D. Kinetic energy
~~
E5D09 (B)
What happens to reactive power in an AC circuit that has both ideal inductors and
ideal capacitors?
A. It is dissipated as heat in the circuit
B. It is repeatedly exchanged between the associated magnetic and electric fields,
but is not dissipated
C. It is dissipated as kinetic energy in the circuit
D. It is dissipated in the formation of inductive and capacitive fields
~~
E5D10 (A)
How can the true power be determined
are out of phase?
A. By multiplying the apparent power
B. By dividing the reactive power by
C. By dividing the apparent power by
D. By multiplying the reactive power
~~
in an AC circuit where the voltage and current
times the
the power
the power
times the
power factor
factor
factor
power factor
E5D11 (C)
What is the power factor of an R-L circuit having a 60 degree phase angle between the
voltage and the current?
A. 1.414
B. 0.866
C. 0.5
D. 1.73
~~
E5D12 (B)
How many watts are consumed in a circuit having a power factor of 0.2 if the input is
100-V AC at 4 amperes?
A. 400 watts
B. 80 watts
C. 2000 watts
D. 50 watts
~~
E5D13 (B)
How much power is consumed in a circuit consisting of a 100 ohm resistor in series
with a 100 ohm inductive reactance drawing 1 ampere?
A. 70.7 Watts
B. 100 Watts
C. 141.4 Watts
D. 200 Watts
~~
E5D14 (A)
What is reactive power?
A. Wattless, nonproductive power
B. Power consumed in wire resistance in an inductor
C. Power lost because of capacitor leakage
D. Power consumed in circuit Q
~~
E5D15 (D)
What is the power factor of an RL circuit having a 45 degree phase angle between the
voltage and the current?
A. 0.866
B. 1.0
C. 0.5
D. 0.707
~~
E5D16 (C)
What is the power factor of an RL circuit having a 30 degree phase angle between the
voltage and the current?
A. 1.73
B. 0.5
C. 0.866
D. 0.577
~~
E5D17 (D)
How many watts are consumed in a circuit having a power factor of 0.6 if the input is
200V AC at 5 amperes?
A. 200 watts
B. 1000 watts
C. 1600 watts
D. 600 watts
~~
E5D18 (B)
How many watts are consumed in a circuit having a power factor of 0.71 if the
apparent power is 500 VA?
A. 704 W
B. 355 W
C. 252 W
D. 1.42 mW
~~
SUBELEMENT E6 - CIRCUIT COMPONENTS [6 Exam Questions - 6 Groups]
E6A Semiconductor materials and devices: semiconductor materials; germanium, silicon,
P-type, N-type; transistor types: NPN, PNP, junction, field-effect transistors:
enhancement mode; depletion mode; MOS; CMOS; N-channel; P-channel
E6A01 (C)
In what application is gallium arsenide used as a semiconductor material in
preference to germanium or silicon?
A. In high-current rectifier circuits
B. In high-power audio circuits
C. At microwave frequencies
D. At very low frequency RF circuits
~~
E6A02 (A)
Which of the following semiconductor materials contains excess free electrons?
A. N-type
B. P-type
C. Bipolar
D. Insulated gate
~~
E6A03 (C)
What are the majority charge carriers in P-type semiconductor material?
A. Free neutrons
B. Free protons
C. Holes
D. Free electrons
~~
E6A04 (C)
What is the name given to an impurity atom that adds holes to a semiconductor crystal
structure?
A. Insulator impurity
B. N-type impurity
C. Acceptor impurity
D. Donor impurity
~~
E6A05 (C)
What is the alpha of a bipolar junction transistor?
A. The change of collector current with respect to base current
B. The change of base current with respect to collector current
C. The change of collector current with respect to emitter current
D. The change of collector current with respect to gate current
~~
E6A06 (B)
What is the beta
A. The frequency
B. The change in
C. The breakdown
D. The switching
~~
of a bipolar junction transistor?
at which the current gain is reduced to 1
collector current with respect to base current
voltage of the base to collector junction
speed of the transistor
E6A07 (A)
In Figure E6-1, what is the schematic symbol for a PNP transistor?
A. 1
B. 2
C. 4
D. 5
~~
E6A08 (D)
What term indicates the frequency at which the grounded-base current gain of a
transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
A. Corner frequency
B. Alpha rejection frequency
C. Beta cutoff frequency
D. Alpha cutoff frequency
~~
E6A09 (A)
What is a depletion-mode FET?
A. An FET that exhibits a current flow between source and drain when no gate voltage
is applied
B. An FET that has no current flow between source and drain when no gate voltage is
applied
C. Any FET without a channel
D. Any FET for which holes are the majority carriers
~~
E6A10 (B)
In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?
A. 2
B. 4
C. 5
D. 6
~~
E6A11 (A)
In Figure E6-2, what is the schematic symbol for a P-channel junction FET?
A. 1
B. 2
C. 3
D. 6
~~
E6A12 (D)
Why do many MOSFET devices have internally connected Zener diodes on the
A. To provide a voltage reference for the correct amount of reverse-bias
B. To protect the substrate from excessive voltages
C. To keep the gate voltage within specifications and prevent the device
overheating
D. To reduce the chance of the gate insulation being punctured by static
or excessive voltages
~~
gates?
gate voltage
from
discharges
E6A13 (C)
What do the initials CMOS stand for?
A. Common Mode Oscillating System
B. Complementary Mica-Oxide Silicon
C. Complementary Metal-Oxide Semiconductor
D. Common Mode Organic Silicon
~~
E6A14 (C)
How does DC input impedance at the gate of a field-effect transistor compare with the
DC input impedance of a bipolar transistor?
A. They are both low impedance
B. An FET has low input impedance; a bipolar transistor has high input impedance
C. An FET has high input impedance; a bipolar transistor has low input impedance
D. They are both high impedance
~~
E6A15 (B)
Which of the following semiconductor materials contains an excess of holes in the
outer shell of electrons?
A. N-type
B. P-type
C. Superconductor-type
D. Bipolar-type
~~
E6A16 (B)
What are the majority charge carriers in N-type semiconductor material?
A. Holes
B. Free electrons
C. Free protons
D. Free neutrons
~~
E6A17 (D)
What are the names of the three terminals of a field-effect transistor?
A. Gate 1, gate 2, drain
B. Emitter, base, collector
C. Emitter, base 1, base 2
D. Gate, drain, source
~~
E6B Semiconductor diodes
E6B01 (B)
What is the most useful characteristic of a
A. A constant current drop under conditions
B. A constant voltage drop under conditions
C. A negative resistance region
D. An internal capacitance that varies with
~~
Zener diode?
of varying voltage
of varying current
the applied voltage
E6B02 (D)
What is an important characteristic of a Schottky diode as compared to an ordinary
silicon diode when used as a power supply rectifier?
A. Much higher reverse voltage breakdown
B. Controlled reverse avalanche voltage
C. Enhanced carrier retention time
D. Less forward voltage drop
~~
E6B03 (C)
What special type of diode is capable of both amplification and oscillation?
A. Point contact
B. Zener
C. Tunnel
D. Junction
~~
E6B04 (A)
What type of semiconductor device is designed for use as a voltage-controlled
capacitor?
A. Varactor diode
B. Tunnel diode
C. Silicon-controlled rectifier
D. Zener diode
~~
E6B05 (D)
What characteristic of a PIN diode makes it useful as an RF switch or attenuator?
A. Extremely high reverse breakdown voltage
B. Ability to dissipate large amounts of power
C. Reverse bias controls its forward voltage drop
D. A large region of intrinsic material
~~
E6B06
Which
A. As
B. As
C. As
D. As
~~
(D)
of the following is a common use of a hot-carrier diode?
balanced mixers in FM generation
a variable capacitance in an automatic frequency control circuit
a constant voltage reference in a power supply
a VHF / UHF mixer or detector
E6B07 (B)
What is the failure mechanism when a junction diode fails due to excessive current?
A. Excessive inverse voltage
B. Excessive junction temperature
C. Insufficient forward voltage
D. Charge carrier depletion
~~
E6B08 (A)
Which of the following describes a type of semiconductor diode?
A. Metal-semiconductor junction
B. Electrolytic rectifier
C. CMOS-field effect
D. Thermionic emission diode
~~
E6B09 (C)
What is a common use for point contact diodes?
A. As a constant current source
B. As a constant voltage source
C. As an RF detector
D. As a high voltage rectifier
~~
E6B10 (B)
In Figure E6-3, what is the schematic symbol for a light-emitting diode?
A. 1
B. 5
C. 6
D. 7
~~
E6B11 (A)
What is used to control the attenuation of RF signals by a PIN diode?
A. Forward DC bias current
B. A sub-harmonic pump signal
C. Reverse voltage larger than the RF signal
D. Capacitance of an RF coupling capacitor
~~
E6B12 (C)
What is one common use for PIN diodes?
A. As a constant current source
B. As a constant voltage source
C. As an RF switch
D. As a high voltage rectifier
~~
E6B13 (B)
What type of bias is required for an LED to emit light?
A. Reverse bias
B. Forward bias
C. Zero bias
D. Inductive bias
~~
E6C Integrated circuits: TTL digital integrated circuits; CMOS digital integrated
circuits; gates
E6C01 (C)
What is the recommended power supply voltage for TTL series integrated circuits?
A. 12 volts
B. 1.5 volts
C. 5 volts
D. 13.6 volts
~~
E6C02 (A)
What logic state do the inputs of a TTL device assume if they are left open?
A. A logic-high state
B. A logic-low state
C. The device becomes randomized and will not provide consistent high or low-logic
states
D. Open inputs on a TTL device are ignored
~~
E6C03 (A)
Which of the following describes tri-state logic?
A. Logic devices with 0, 1, and high impedance output states
B. Logic devices that utilize ternary math
C. Low power logic devices designed to operate at 3 volts
D. Proprietary logic devices manufactured by Tri-State Devices
~~
E6C04 (B)
Which of the following is the primary advantage of tri-state logic?
A. Low power consumption
B. Ability to connect many device outputs to a common bus
C. High speed operation
D. More efficient arithmetic operations
~~
E6C05 (D)
Which of the following is an advantage of CMOS logic devices over TTL devices?
A. Differential output capability
B. Lower distortion
C. Immune to damage from static discharge
D. Lower power consumption
~~
E6C06 (C)
Why do CMOS digital integrated circuits have high immunity to noise on the input
signal or power supply?
A. Larger bypass capacitors are used in CMOS circuit design
B. The input switching threshold is about two times the power supply voltage
C. The input switching threshold is about one-half the power supply voltage
D. Input signals are stronger
~~
E6C07 (A)
In Figure E6-5, what is the schematic symbol for an AND gate?
A. 1
B. 2
C. 3
D. 4
~~
E6C08 (B)
In Figure E6-5, what is the schematic symbol for a NAND gate?
A. 1
B. 2
C. 3
D. 4
~~
E6C09 (B)
In Figure E6-5, what is the schematic symbol for an OR gate?
A. 2
B. 3
C. 4
D. 6
~~
E6C10 (D)
In Figure E6-5, what is the schematic symbol for a NOR gate?
A. 1
B. 2
C. 3
D. 4
~~
E6C11 (C)
In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?
A. 2
B. 4
C. 5
D. 6
~~
E6C12 (D)
What is BiCMOS logic?
A. A logic device with two CMOS circuits per package
B. An FET logic family based on bimetallic semiconductors
C. A logic family based on bismuth CMOS devices
D. An integrated circuit logic family using both bipolar and CMOS transistors
~~
E6C13 (C)
Which of the following is an advantage of BiCMOS logic?
A. Its simplicity results in much less expensive devices than standard CMOS
B. It is totally immune to electrostatic damage
C. It has the high input impedance of CMOS and the low output impedance of bipolar
transistors
D. All of these choices are correct
~~
E6D Optical devices and toroids: cathode-ray tube devices; charge-coupled devices
(CCDs); liquid crystal displays (LCDs) Toroids: permeability; core material;
selecting; winding
E6D01 (D)
What is cathode ray tube (CRT) persistence?
A. The time it takes for an image to appear after the electron beam is turned on
B. The relative brightness of the display under varying conditions of ambient light
C. The ability of the display to remain in focus under varying conditions
D. The length of time the image remains on the screen after the beam is turned off
~~
E6D02 (B)
Exceeding what design rating can cause a cathode ray tube (CRT) to generate X-rays?
A. The heater voltage
B. The anode voltage
C. The operating temperature
D. The operating frequency
~~
E6D03 (C)
Which of the following is true of a charge-coupled device (CCD)?
A. Its phase shift changes rapidly with frequency
B. It is a CMOS analog-to-digital converter
C. It samples an analog signal and passes it in stages from the input to the output
D. It is used in a battery charger circuit
~~
E6D04 (A)
What function does a charge-coupled device (CCD) serve in a modern video camera?
A. It stores photogenerated charges as signals corresponding to pixels
B. It generates the horizontal pulses needed for electron beam scanning
C. It focuses the light used to produce a pattern of electrical charges corresponding
to the image
D. It combines audio and video information to produce a composite RF signal
~~
E6D05 (B)
What is a liquid-crystal display (LCD)?
A. A modern replacement for a quartz crystal oscillator which displays its
fundamental frequency
B. A display using a crystalline liquid which, in conjunction with polarizing
filters, becomes opaque when voltage is applied
C. A frequency-determining unit for a transmitter or receiver
D. A display that uses a glowing liquid to remain brightly lit in dim light
~~
E6D06 (D)
What core material property determines the inductance of a toroidal inductor?
A. Thermal impedance
B. Resistance
C. Reactivity
D. Permeability
~~
E6D07 (B)
What is the usable frequency range of inductors that use toroidal cores, assuming a
correct selection of core material for the frequency being used?
A. From a few kHz to no more than 30 MHz
B. From less than 20 Hz to approximately 300 MHz
C. From approximately 10 Hz to no more than 3000 kHz
D. From about 100 kHz to at least 1000 GHz
~~
E6D08 (B)
What is one important reason for using powdered-iron toroids rather than ferrite
toroids in an inductor?
A. Powdered-iron toroids generally have greater initial permeability
B. Powdered-iron toroids generally maintain their characteristics at higher currents
C. Powdered-iron toroids generally require fewer turns to produce a given inductance
value
D. Powdered-iron toroids have higher power handling capacity
~~
E6D09 (C)
What devices are commonly used as VHF and UHF parasitic suppressors at the input and
output terminals of transistorized HF amplifiers?
A. Electrolytic capacitors
B. Butterworth filters
C. Ferrite beads
D. Steel-core toroids
~~
E6D10 (A)
What is a primary advantage of using a toroidal core instead of a solenoidal core in
an inductor?
A. Toroidal cores confine most of the magnetic field within the core material
B. Toroidal cores make it easier to couple the magnetic energy into other components
C. Toroidal cores exhibit greater hysteresis
D. Toroidal cores have lower Q characteristics
~~
E6D11 (C)
How many turns will be required to produce a 1-mH inductor using a ferrite toroidal
core that has an inductance index (A L) value of 523 millihenrys/1000 turns?
A. 2 turns
B. 4 turns
C. 43 turns
D. 229 turns
~~
E6D12 (A)
How many turns will be required to produce a 5-microhenry inductor using a powderediron toroidal core that has an inductance index (A L) value of 40 microhenrys/100
turns?
A. 35 turns
B. 13 turns
C. 79 turns
D. 141 turns
~~
E6D13 (D)
What type of CRT deflection is better when high-frequency waveforms are to be
displayed on the screen?
A. Electromagnetic
B. Tubular
C. Radar
D. Electrostatic
~~
E6D14
Which
A. It
B. It
C. It
D. It
~~
(C)
is NOT true of a charge-coupled device (CCD)?
uses a combination of analog and digital circuitry
can be used to make an audio delay line
is commonly used as an analog-to-digital converter
samples and stores analog signals
E6D15 (A)
What is the principle advantage of liquid-crystal display (LCD) devices over other
types of display devices?
A. They consume less power
B. They can display changes instantly
C. They are visible in all light conditions
D. They can be easily interchanged with other display devices
~~
E6D16 (C)
What is one reason
inductor?
A. Ferrite toroids
B. Ferrite toroids
C. Ferrite toroids
D. Ferrite toroids
~~
for using ferrite toroids rather than powdered-iron toroids in an
generally have lower initial permeabilities
generally have better temperature stability
generally require fewer turns to produce a given inductance value
are easier to use with surface mount technology
E6E Piezoelectric crystals and MMICs: quartz crystal oscillators and crystal
filters); monolithic amplifiers
E6E01 (D)
What is a crystal lattice filter?
A. A power supply filter made with interlaced quartz crystals
B. An audio filter made with four quartz crystals that resonate at 1-kHz intervals
C. A filter with wide bandwidth and shallow skirts made using quartz crystals
D. A filter with narrow bandwidth and steep skirts made using quartz crystals
~~
E6E02 (A)
Which of the following factors has the greatest effect in helping determine the
bandwidth and response shape of a crystal ladder filter?
A. The relative frequencies of the individual crystals
B. The DC voltage applied to the quartz crystal
C. The gain of the RF stage preceding the filter
D. The amplitude of the signals passing through the filter
~~
E6E03 (A)
What is one aspect of the piezoelectric effect?
A. Physical deformation of a crystal by the application of a
B. Mechanical deformation of a crystal by the application of
C. The generation of electrical energy by the application of
D. Reversed conduction states when a P-N junction is exposed
~~
voltage
a magnetic field
light
to light
E6E04 (A)
What is the most common input and output impedance of circuits that use MMICs?
A. 50 ohms
B. 300 ohms
C. 450 ohms
D. 10 ohms
~~
E6E05 (A)
Which of the following noise figure values is typical of a low-noise UHF
preamplifier?
A. 2 dB
B. -10 dB
C. 44 dBm
D. -20 dBm
~~
E6E06 (D)
What characteristics of the MMIC make it a popular choice for VHF through microwave
circuits?
A. The ability to retrieve information from a single signal even in the presence of
other strong signals.
B. Plate current that is controlled by a control grid
C. Nearly infinite gain, very high input impedance, and very low output impedance
D. Controlled gain, low noise figure, and constant input and output impedance over
the specified frequency range
~~
E6E07 (B)
Which of the following is typically used to construct a MMIC-based microwave
amplifier?
A. Ground-plane construction
B. Microstrip construction
C. Point-to-point construction
D. Wave-soldering construction
~~
E6E08 (A)
How is power-supply voltage normally furnished to the most common type of monolithic
microwave integrated circuit (MMIC)?
A. Through a resistor and/or RF choke connected to the amplifier output lead
B. MMICs require no operating bias
C. Through a capacitor and RF choke connected to the amplifier input lead
D. Directly to the bias-voltage (VCC IN) lead
~~
E6E09 (B)
Which of the following
frequency specified by
A. Provide the crystal
B. Provide the crystal
C. Bias the crystal at
D. Bias the crystal at
~~
must be done to insure that a crystal oscillator provides the
the crystal manufacturer?
with a specified parallel inductance
with a specified parallel capacitance
a specified voltage
a specified current
E6E10 (A)
What is the equivalent circuit of a quartz crystal?
A. Motional capacitance, motional inductance and loss resistance in series, with a
shunt capacitance representing electrode and stray capacitance
B. Motional capacitance, motional inductance, loss resistance, and a capacitor
representing electrode and stray capacitance all in parallel
C. Motional capacitance, motional inductance, loss resistance, and a capacitor
represent electrode and stray capacitance all in series
D. Motional inductance and loss resistance in series, paralleled with motional
capacitance and a capacitor representing electrode and stray capacitance
~~
E6E11 (D)
Which of the following materials is likely to provide the highest frequency of
operation when used in MMICs?
A. Silicon
B. Silicon nitride
C. Silicon dioxide
D. Gallium nitride
~~
E6E12 (B)
What is a "Jones filter" as used as part of a HF receiver IF stage?
A. An automatic notch filter
B. A variable bandwidth crystal lattice filter
C. A special filter that emphasizes image responses
D. A filter that removes impulse noise
~~
E6F Optical components and power systems: photoconductive principles and effects,
photovoltaic systems, optical couplers, optical sensors, and optoisolators
E6F01 (B)
What is photoconductivity?
A. The conversion of photon energy to electromotive energy
B. The increased conductivity of an illuminated semiconductor
C. The conversion of electromotive energy to photon energy
D. The decreased conductivity of an illuminated semiconductor
~~
E6F02 (A)
What happens to the conductivity of a photoconductive material when light shines on
it?
A. It increases
B. It decreases
C. It stays the same
D. It becomes unstable
~~
E6F03 (D)
What is the most common configuration of an optoisolator or optocoupler?
A. A lens and a photomultiplier
B. A frequency modulated helium-neon laser
C. An amplitude modulated helium-neon laser
D. An LED and a phototransistor
~~
E6F04 (B)
What is the photovoltaic effect?
A. The conversion of voltage to current when exposed to light
B. The conversion of light to electrical energy
C. The conversion of electrical energy to mechanical energy
D. The tendency of a battery to discharge when used outside
~~
E6F05 (A)
Which of the following describes an optical shaft encoder?
A. A device which detects rotation of a control by interrupting a light source with a
patterned wheel
B. A device which measures the strength a beam of light using analog to digital
conversion
C. A digital encryption device often used to encrypt spacecraft control signals
D. A device for generating RTTY signals by means of a rotating light source.
~~
E6F06 (A)
Which of these materials is affected the most by photoconductivity?
A. A crystalline semiconductor
B. An ordinary metal
C. A heavy metal
D. A liquid semiconductor
~~
E6F07 (B)
What is a solid state relay?
A. A relay using transistors to drive the relay coil
B. A device that uses semiconductor devices to implement the functions of an
electromechanical relay
C. A mechanical relay that latches in the on or off state each time it is pulsed
D. A passive delay line
~~
E6F08 (C)
Why are optoisolators often used in conjunction with solid state circuits when
switching 120 VAC?
A. Optoisolators provide a low impedance link between a control circuit and a power
circuit
B. Optoisolators provide impedance matching between the control circuit and power
circuit
C. Optoisolators provide a very high degree of electrical isolation between a control
circuit and the circuit being switched
D. Optoisolators eliminate the effects of reflected light in the control circuit
~~
E6F09 (D)
What is the efficiency of a photovoltaic cell?
A. The output RF power divided by the input dc power
B. The effective payback period
C. The open-circuit voltage divided by the short-circuit current under full
illumination
D. The relative fraction of light that is converted to current
~~
E6F10 (B)
What is the most common type of photovoltaic cell used for electrical power
generation?
A. Selenium
B. Silicon
C. Cadmium Sulfide
D. Copper oxide
~~
E6F11 (B)
Which of the following is the approximate open-circuit voltage produced by a fullyilluminated silicon photovoltaic cell?
A. 0.1 V
B. 0.5 V
C. 1.5 V
D. 12 V
~~
E6F12 (C)
What absorbs the energy from light falling on a photovoltaic cell?
A. Protons
B. Photons
C. Electrons
D. Holes
~~
SUBELEMENT E7 - PRACTICAL CIRCUITS [8 Exam Questions - 8 Groups]
E7A Digital circuits: digital circuit principles and logic circuits: classes of logic
elements; positive and negative logic; frequency dividers; truth tables
E7A01 (C)
Which of the following is a bistable circuit?
A. An "AND" gate
B. An "OR" gate
C. A flip-flop
D. A clock
~~
E7A02 (C)
How many output level changes are obtained for every two trigger pulses applied to
the input of a T flip-flop circuit?
A. None
B. One
C. Two
D. Four
~~
E7A03 (B)
Which of the following can divide the frequency of a pulse train by 2?
A. An XOR gate
B. A flip-flop
C. An OR gate
D. A multiplexer
~~
E7A04 (B)
How many flip-flops are required to divide a signal frequency by 4?
A. 1
B. 2
C. 4
D. 8
~~
E7A05 (D)
Which of the following is a circuit that continuously alternates between two states
without an external clock?
A. Monostable multivibrator
B. J-K flip-flop
C. T flip-flop
D. Astable multivibrator
~~
E7A06 (A)
What is a characteristic of a monostable multivibrator?
A. It switches momentarily to the opposite binary state and then returns, after a set
time, to its original state
B. It is a clock that produces a continuous square wave oscillating between 1 and 0
C. It stores one bit of data in either a 0 or 1 state
D. It maintains a constant output voltage, regardless of variations in the input
voltage
~~
E7A07 (D)
What logical operation
A. It produces a logic
B. It produces a logic
C. It produces a logic
"1"
D. It produces a logic
~~
does a
"0" at
"1" at
"0" at
NAND gate perform?
its output only when all inputs are logic "0"
its output only when all inputs are logic "1"
its output if some but not all of its inputs are logic
"0" at its output only when all inputs are logic "1"
E7A08 (A)
What logical operation does an OR gate perform?
A. It produces a logic "1" at its output if any or all
B. It produces a logic "0" at its output if all inputs
C. It only produces a logic "0" at its output when all
D. It produces a logic "1" at its output if all inputs
~~
E7A09 (C)
What logical operation
A. It produces a logic
B. It produces a logic
C. It produces a logic
D. It produces a logic
~~
is performed by a
"0" at its output
"1" at its output
"0" at its output
"1" at its output
inputs are logic "1"
are logic "1"
inputs are logic "1"
are logic "0"
two-input exclusive NOR gate?
only if all inputs are logic "0"
only if all inputs are logic "1"
if any single input is a logic “1”
if any single input is a logic “1”
E7A10 (C)
What is a truth table?
A. A table of logic symbols that indicate the high logic states of an op-amp
B. A diagram showing logic states when the digital device's output is true
C. A list of inputs and corresponding outputs for a digital device
D. A table of logic symbols that indicates the low logic states of an op-amp
~~
E7A11 (D)
What is the name for logic which represents a logic "1" as a high voltage?
A. Reverse Logic
B. Assertive Logic
C. Negative logic
D. Positive Logic
~~
E7A12 (C)
What is the name for logic which represents a logic "0" as a high voltage?
A. Reverse Logic
B. Assertive Logic
C. Negative logic
D. Positive Logic
~~
E7A13 (B)
What is an SR or RS flip-flop?
A. A speed-reduced logic device with high power capability
B. A set/reset flip-flop whose output is low when R is high and S is low, high when S
is high and R is low, and unchanged when both inputs are low
C. A speed-reduced logic device with very low voltage operation capability
D. A set/reset flip-flop that toggles whenever the T input is pulsed, unless both
inputs are high
~~
E7A14 (A)
What is a JK flip-flop?
A. A flip-flop similar to an RS except that it toggles when both J and K are high
B. A flip-flop utilizing low power, low temperature Joule-Kelvin devices
C. A flip-flop similar to a D flip-flop except that it triggers on the negative clock
edge
D. A flip-flop originally developed in Japan and Korea which has very low power
consumption
~~
E7A15 (A)
What is a D flip-flop?
A. A flip-flop whose output takes on the state of the D input when the clock signal
transitions from low to high
B. A differential class D amplifier used as a flip-flop circuit
C. A dynamic memory storage element
D. A flip-flop whose output is capable of both positive and negative voltage
excursions
~~
E7B Amplifiers: Class of operation; vacuum tube and solid-state circuits; distortion
and intermodulation; spurious and parasitic suppression; microwave amplifiers
E7B01 (A)
For what portion of a signal cycle does a Class AB amplifier operate?
A. More than 180 degrees but less than 360 degrees
B. Exactly 180 degrees
C. The entire cycle
D. Less than 180 degrees
~~
E7B02 (A)
What is a Class D amplifier?
A. A type of amplifier that uses switching technology to achieve high efficiency
B. A low power amplifier using a differential amplifier for improved linearity
C. An amplifier using drift-mode FETs for high efficiency
D. A frequency doubling amplifier
~~
E7B03 (A)
Which of the following forms the output of a class D amplifier circuit?
A. A low-pass filter to remove switching signal components
B. A high-pass filter to compensate for low gain at low frequencies
C. A matched load resistor to prevent damage by switching transients
D. A temperature-compensated load resistor to improve linearity
~~
E7B04 (A)
Where on the load line of a Class A common emitter amplifier would bias normally be
set?
A. Approximately half-way between saturation and cutoff
B. Where the load line intersects the voltage axis
C. At a point where the bias resistor equals the load resistor
D. At a point where the load line intersects the zero bias current curve
~~
E7B05 (C)
What can be done to prevent unwanted oscillations in an RF power amplifier?
A. Tune the stage for maximum SWR
B. Tune both the input and output for maximum power
C. Install parasitic suppressors and/or neutralize the stage
D. Use a phase inverter in the output filter
~~
E7B06 (B)
Which of the following amplifier types reduces or eliminates even-order harmonics?
A. Push-push
B. Push-pull
C. Class C
D. Class AB
~~
E7B07 (D)
Which of the following is a likely result when a Class C amplifier is used to amplify
a single-sideband phone signal?
A. Reduced intermodulation products
B. Increased overall intelligibility
C. Signal inversion
D. Signal distortion and excessive bandwidth
~~
E7B08 (C)
How can an RF power amplifier be neutralized?
A. By increasing the driving power
B. By reducing the driving power
C. By feeding a 180-degree out-of-phase portion of the output back to the input
D. By feeding an in-phase component of the output back to the input
~~
E7B09 (D)
Which of the following describes how the loading and tuning capacitors are to be
adjusted when tuning a vacuum tube RF power amplifier that employs a pi-network
output circuit?
A. The loading capacitor is set to maximum capacitance and the tuning capacitor is
adjusted for minimum allowable plate current
B. The tuning capacitor is set to maximum capacitance and the loading capacitor is
adjusted for minimum plate permissible current
C. The loading capacitor is adjusted to minimum plate current while alternately
adjusting the tuning capacitor for maximum allowable plate current
D. The tuning capacitor is adjusted for minimum plate current, while the loading
capacitor is adjusted for maximum permissible plate current
~~
E7B10 (B)
In Figure E7-1, what is the purpose of R1 and R2?
A. Load resistors
B. Fixed bias
C. Self bias
D. Feedback
~~
E7B11 (D)
In Figure E7-1, what is the purpose of R3?
A. Fixed bias
B. Emitter bypass
C. Output load resistor
D. Self bias
~~
E7B12 (C)
What type of circuit is shown in Figure E7-1?
A. Switching voltage regulator
B. Linear voltage regulator
C. Common emitter amplifier
D. Emitter follower amplifier
~~
E7B13 (A)
In Figure E7-2, what is the purpose of R?
A. Emitter load
B. Fixed bias
C. Collector load
D. Voltage regulation
~~
E7B14 (A)
In Figure E7-2, what is the purpose of C2?
A. Output coupling
B. Emitter bypass
C. Input coupling
D. Hum filtering
~~
E7B15 (C)
What is one way to prevent thermal runaway in a bipolar transistor amplifier?
A. Neutralization
B. Select transistors with high beta
C. Use a resistor in series with the emitter
D. All of these choices are correct
~~
E7B16 (A)
What is the effect of intermodulation products in a linear power amplifier?
A. Transmission of spurious signals
B. Creation of parasitic oscillations
C. Low efficiency
D. All of these choices are correct
~~
E7B17 (A)
Why are third-order intermodulation distortion products of particular concern in
linear power amplifiers?
A.
B.
C.
D.
~~
Because
Because
Because
Because
they
they
they
they
are relatively close in frequency to the desired signal
are relatively far in frequency from the desired signal
invert the sidebands causing distortion
maintain the sidebands, thus causing multiple duplicate signals
E7B18 (C)
Which of the following is a characteristic of a grounded-grid amplifier?
A. High power gain
B. High filament voltage
C. Low input impedance
D. Low bandwidth
~~
E7B19 (D)
What is a klystron?
A. A high speed multivibrator
B. An electron-coupled oscillator utilizing a pentode vacuum tube
C. An oscillator utilizing ceramic elements to achieve stability
D. A VHF, UHF, or microwave vacuum tube that uses velocity modulation
~~
E7B20 (B)
What is a parametric amplifier?
A. A type of bipolar operational amplifier with excellent linearity derived from use
of very high voltage on the collector
B. A low-noise VHF or UHF amplifier relying on varying reactance for amplification
C. A high power amplifier for HF application utilizing the Miller effect to increase
gain
D. An audio push-pull amplifier using silicon carbide transistors for extremely low
noise
~~
E7B21 (A)
Which of the following devices is generally best suited for UHF or microwave power
amplifier applications?
A. Field effect transistor
B. Nuvistor
C. Silicon controlled rectifier
D. Triac
~~
E7C Filters and matching networks: types of networks; types of filters; filter
applications; filter characteristics; impedance matching; DSP filtering
E7C01 (D)
How are the capacitors and inductors of a low-pass filter Pi-network arranged between
the network's input and output?
A. Two inductors are in series between the input and output, and a capacitor is
connected between the two inductors and ground
B. Two capacitors are in series between the input and output and an inductor is
connected between the two capacitors and ground
C. An inductor is connected between the input and ground, another inductor is
connected between the output and ground, and a capacitor is connected between the
input and output
D. A capacitor is connected between the input and ground, another capacitor is
connected between the output and ground, and an inductor is connected between input
and output
~~
E7C02 (C)
A T-network with series capacitors and a parallel shunt inductor has which of the
following properties?
A. It is a low-pass filter
B. It is a band-pass filter
C. It is a high-pass filter
D. It is a notch filter
~~
E7C03 (A)
What advantage does a Pi-L-network have over a Pi-network for impedance matching
between the final amplifier of a vacuum-tube transmitter and an antenna?
A. Greater harmonic suppression
B. Higher efficiency
C. Lower losses
D. Greater transformation range
~~
E7C04 (C)
How does an impedance-matching circuit transform a complex impedance to a resistive
impedance?
A. It introduces negative resistance to cancel the resistive part of impedance
B. It introduces transconductance to cancel the reactive part of impedance
C. It cancels the reactive part of the impedance and changes the resistive part to a
desired value
D. Network resistances are substituted for load resistances and reactances are
matched to the resistances
~~
E7C05 (D)
Which filter type is described as having ripple in the passband and a sharp cutoff?
A. A Butterworth filter
B. An active LC filter
C. A passive op-amp filter
D. A Chebyshev filter
~~
E7C06 (C)
What are the distinguishing features of an elliptical filter?
A. Gradual passband rolloff with minimal stop band ripple
B. Extremely flat response over its pass band with gradually rounded stop band
corners
C. Extremely sharp cutoff with one or more notches in the stop band
D. Gradual passband rolloff with extreme stop band ripple
~~
E7C07 (B)
What kind of filter would you use to attenuate an interfering carrier signal while
receiving an SSB transmission?
A. A band-pass filter
B. A notch filter
C. A Pi-network filter
D. An all-pass filter
~~
E7C08 (A)
What kind of digital signal processing audio filter might be used to remove unwanted
noise from a received SSB signal?
A. An adaptive filter
B. A crystal-lattice filter
C. A Hilbert-transform filter
D. A phase-inverting filter
~~
E7C09 (C)
What type of digital signal processing filter might be used to generate an SSB
signal?
A. An adaptive filter
B. A notch filter
C. A Hilbert-transform filter
D. An elliptical filter
~~
E7C10 (B)
Which of the following filters would be the best choice for use in a 2 meter repeater
duplexer?
A. A crystal filter
B. A cavity filter
C. A DSP filter
D. An L-C filter
~~
E7C11 (D)
Which of the following is the common name for a filter network which is equivalent to
two L networks connected back-to-back with the inductors in series and the capacitors
in shunt at the input and output?
A. Pi-L
B. Cascode
C. Omega
D. Pi
~~
E7C12 (B)
Which of the following describes a Pi-L network used for matching a vacuum-tube final
amplifier to a 50-ohm unbalanced output?
A. A Phase Inverter Load network
B. A Pi network with an additional series inductor on the output
C. A network with only three discrete parts
D. A matching network in which all components are isolated from ground
~~
E7C13 (A)
What is one advantage of a Pi matching network over an L matching network consisting
of a single inductor and a single capacitor?
A. The Q of Pi networks can be varied depending on the component values chosen
B. L networks can not perform impedance transformation
C. Pi networks have fewer components
D. Pi networks are designed for balanced input and output
~~
E7C14 (C)
Which of these modes is most affected by non-linear phase response in a receiver IF
filter?
A. Meteor Scatter
B. Single-Sideband voice
C. Digital
D. Video
~~
E7D Power supplies and voltage regulators
E7D01 (D)
What is one characteristic of a linear electronic voltage regulator?
A. It has a ramp voltage as its output
B. It eliminates the need for a pass transistor
C. The control element duty cycle is proportional to the line or load conditions
D. The conduction of a control element is varied to maintain a constant output
voltage
~~
E7D02 (C)
What is one characteristic of a switching electronic voltage regulator?
A. The resistance of a control element is varied in direct proportion to the line
voltage or load current
B. It is generally less efficient than a linear regulator
C. The control device’s duty cycle is controlled to produce a constant average output
voltage
D. It gives a ramp voltage at its output
~~
E7D03 (A)
What device is typically used as a stable reference voltage in a linear voltage
regulator?
A. A Zener diode
B. A tunnel diode
C. An SCR
D. A varactor diode
~~
E7D04 (B)
Which of the following types of linear voltage regulator usually make the most
efficient use of the primary power source?
A. A series current source
B. A series regulator
C. A shunt regulator
D. A shunt current source
~~
E7D05 (D)
Which of the following types of linear voltage regulator places a constant load on
the unregulated voltage source?
A. A constant current source
B. A series regulator
C. A shunt current source
D. A shunt regulator
~~
E7D06 (C)
What is the purpose of Q1 in the circuit shown in Figure E7-3?
A. It provides negative feedback to improve regulation
B. It provides a constant load for the voltage source
C. It increases the current-handling capability of the regulator
D. It provides D1 with current
~~
E7D07 (A)
What is the purpose of C2 in the circuit shown in Figure E7-3?
A. It bypasses hum around D1
B. It is a brute force filter for the output
C. To self-resonate at the hum frequency
D. To provide fixed DC bias for Q1
~~
E7D08 (C)
What type of circuit is shown in Figure E7-3?
A. Switching voltage regulator
B. Grounded emitter amplifier
C. Linear voltage regulator
D. Emitter follower
~~
E7D09 (D)
What is the purpose of C1 in the circuit shown in Figure E7-3?
A. It resonates at the ripple frequency
B. It provides fixed bias for Q1
C. It decouples the output
D. It filters the supply voltage
~~
E7D10 (A)
What is the purpose of C3 in the circuit shown in Figure E7-3?
A. It prevents self-oscillation
B. It provides brute force filtering of the output
C. It provides fixed bias for Q1
D. It clips the peaks of the ripple
~~
E7D11 (C)
What is the purpose of R1
A. It provides a constant
B. It couples hum to D1
C. It supplies current to
D. It bypasses hum around
~~
in the circuit shown in Figure E7-3?
load to the voltage source
D1
D1
E7D12 (D)
What is the purpose of R2 in the circuit shown in Figure E7-3?
A. It provides fixed bias for Q1
B. It provides fixed bias for D1
C. It decouples hum from D1
D. It provides a constant minimum load for Q1
~~
E7D13 (B)
What is the purpose of D1 in the circuit shown in Figure E7-3?
A. To provide line voltage stabilization
B. To provide a voltage reference
C. Peak clipping
D. Hum filtering
~~
E7D14 (C)
What is one purpose of a "bleeder" resistor in a conventional (unregulated) power
supply?
A. To cut down on waste heat generated by the power supply
B. To balance the low-voltage filament windings
C. To improve output voltage regulation
D. To boost the amount of output current
~~
E7D15 (D)
What is the purpose of a "step-start" circuit in a high-voltage power supply?
A. To provide a dual-voltage output for reduced power applications
B. To compensate for variations of the incoming line voltage
C. To allow for remote control of the power supply
D. To allow the filter capacitors to charge gradually
~~
E7D16 (D)
When several electrolytic filter capacitors are connected in series to increase the
operating voltage of a power supply filter circuit, why should resistors be connected
across each capacitor?
A.
B.
C.
D.
~~
To equalize,
To provide a
To provide a
All of these
as much as possible, the voltage drop across each capacitor
safety bleeder to discharge the capacitors when the supply is off
minimum load current to reduce voltage excursions at light loads
choices are correct
E7D17 (C)
What is the primary reason that a high-frequency inverter type high-voltage power
supply can be both less expensive and lighter in weight than a conventional power
supply?
A. The inverter design does not require any output filtering
B. It uses a diode bridge rectifier for increased output
C. The high frequency inverter design uses much smaller transformers and filter
components for an equivalent power output
D. It uses a large power-factor compensation capacitor to create "free power” from
the unused portion of the AC cycle
~~
E7E Modulation and demodulation: reactance, phase and balanced modulators; detectors;
mixer stages; DSP modulation and demodulation; software defined radio systems
E7E01 (B)
Which of the following can be used to generate FM phone emissions?
A. A balanced modulator on the audio amplifier
B. A reactance modulator on the oscillator
C. A reactance modulator on the final amplifier
D. A balanced modulator on the oscillator
~~
E7E02 (D)
What is the function of a reactance modulator?
A. To produce PM signals by using an electrically
B. To produce AM signals by using an electrically
C. To produce AM signals by using an electrically
D. To produce PM signals by using an electrically
~~
E7E03 (C)
How does an analog phase
A. By varying the tuning
B. By varying the tuning
C. By varying the tuning
D. By varying the tuning
~~
variable
variable
variable
variable
modulator function?
of a microphone preamplifier
of an amplifier tank circuit
of an amplifier tank circuit
of a microphone preamplifier
to
to
to
to
resistance
inductance or capacitance
resistance
inductance or capacitance
produce
produce
produce
produce
PM
AM
PM
AM
signals
signals
signals
signals
E7E04 (A)
What is one way a single-sideband phone signal can be generated?
A. By using a balanced modulator followed by a filter
B. By using a reactance modulator followed by a mixer
C. By using a loop modulator followed by a mixer
D. By driving a product detector with a DSB signal
~~
E7E05 (D)
What circuit is added to an FM transmitter to boost the higher audio frequencies?
A. A de-emphasis network
B. A heterodyne suppressor
C. An audio prescaler
D. A pre-emphasis network
~~
E7E06 (A)
Why is de-emphasis commonly used in FM communications receivers?
A. For compatibility with transmitters using phase modulation
B. To reduce impulse noise reception
C. For higher efficiency
D. To remove third-order distortion products
~~
E7E07 (B)
What is meant by the term baseband in radio communications?
A. The lowest frequency band that the transmitter or receiver covers
B. The frequency components present in the modulating signal
C. The unmodulated bandwidth of the transmitted signal
D. The basic oscillator frequency in an FM transmitter that is multiplied to increase
the deviation and carrier frequency
~~
E7E08 (C)
What are the principal frequencies that appear at the output of a mixer circuit?
A. Two and four times the original frequency
B. The sum, difference and square root of the input frequencies
C. The two input frequencies along with their sum and difference frequencies
D. 1.414 and 0.707 times the input frequency
~~
E7E09 (A)
What occurs when an excessive amount of signal energy reaches a mixer circuit?
A. Spurious mixer products are generated
B. Mixer blanking occurs
C. Automatic limiting occurs
D. A beat frequency is generated
~~
E7E10 (A)
How does a diode detector function?
A. By rectification and filtering of RF signals
B. By breakdown of the Zener voltage
C. By mixing signals with noise in the transition region of the diode
D. By sensing the change of reactance in the diode with respect to frequency
~~
E7E11 (C)
Which of the following types of detector is well suited for demodulating SSB signals?
A. Discriminator
B. Phase detector
C. Product detector
D. Phase comparator
~~
E7E12 (D)
What is a frequency discriminator stage in a FM receiver?
A. An FM generator circuit
B. A circuit for filtering two closely adjacent signals
C. An automatic band-switching circuit
D. A circuit for detecting FM signals
~~
E7E13 (D)
Which of the following describes a common means of generating an SSB signal when
using digital signal processing?
A. Mixing products are converted to voltages and subtracted by adder circuits
B. A frequency synthesizer removes the unwanted sidebands
C. Emulation of quartz crystal filter characteristics
D. The quadrature method
~~
E7E14 (C)
What is meant by direct conversion when referring to a software defined receiver?
A. Software is converted from source code to object code during operation of the
receiver
B. Incoming RF is converted to the IF frequency by rectification to generate the
control voltage for a voltage controlled oscillator
C. Incoming RF is mixed to “baseband” for analog-to-digital conversion and subsequent
processing
D. Software is generated in machine language, avoiding the need for compilers
~~
E7F Frequency markers and counters: frequency divider circuits; frequency marker
generators; frequency counters
E7F01 (D)
What is the purpose of a prescaler circuit?
A. It converts the output of a JK flip flop to that of an RS flip-flop
B. It multiplies a higher frequency signal so a low-frequency counter can display the
operating frequency
C. It prevents oscillation in a low-frequency counter circuit
D. It divides a higher frequency signal so a low-frequency counter can display the
input frequency
~~
E7F02 (B)
Which of the following would be used to reduce a signal’s frequency by a factor of
ten?
A. A preamp
B. A prescaler
C. A marker generator
D. A flip-flop
~~
E7F03 (A)
What is the function of a decade counter digital IC?
A. It produces one output pulse for every ten input pulses
B. It decodes a decimal number for display on a seven-segment LED display
C. It produces ten output pulses for every input pulse
D. It adds two decimal numbers together
~~
E7F04 (C)
What additional circuitry must be added to a 100-kHz crystal-controlled marker
generator so as to provide markers at 50 and 25 kHz?
A. An emitter-follower
B. Two frequency multipliers
C. Two flip-flops
D. A voltage divider
~~
E7F05 (D)
Which of the following is a technique for providing high stability oscillators needed
for microwave transmission and reception?
A. Use a GPS signal reference
B. Use a rubidium stabilized reference oscillator
C. Use a temperature-controlled high Q dielectric resonator
D. All of these choices are correct
E7F06 (C)
What is one purpose of a marker generator?
A. To add audio markers to an oscilloscope
B. To provide a frequency reference for a phase locked loop
C. To provide a means of calibrating a receiver's frequency settings
D. To add time signals to a transmitted signal
~~
E7F07 (A)
What determines the accuracy of a frequency counter?
A. The accuracy of the time base
B. The speed of the logic devices used
C. Accuracy of the AC input frequency to the power supply
D. Proper balancing of the mixer diodes
~~
E7F08 (C)
Which of the following is performed by a frequency counter?
A. Determining the frequency deviation with an FM discriminator
B. Mixing the incoming signal with a WWV reference
C. Counting the number of input pulses occurring within a specific period of time
D. Converting the phase of the measured signal to a voltage which is proportional to
the frequency
~~
E7F09 (A)
What is the purpose of a frequency counter?
A. To provide a digital representation of the frequency of a signal
B. To generate a series of reference signals at known frequency intervals
C. To display all frequency components of a transmitted signal
D. To provide a signal source at a very accurate frequency
~~
E7F10 (B)
What alternate method of determining frequency, other than by directly counting input
pulses, is used by some counters?
A. GPS averaging
B. Period measurement plus mathematical computation
C. Prescaling
D. D/A conversion
~~
E7F11 (C)
What is an advantage of a period-measuring frequency counter over a direct-count
type?
A. It can run on battery power for remote measurements
B. It does not require an expensive high-precision time base
C. It provides improved resolution of low-frequency signals within a comparable time
period
D. It can directly measure the modulation index of an FM transmitter
~~
E7G Active filters and op-amps: active audio filters; characteristics; basic circuit
design; operational amplifiers
E7G01 (B)
What primarily determines the gain and frequency characteristics of an op-amp RC
active filter?
A. The values of capacitors and resistors built into the op-amp
B. The values of capacitors and resistors external to the op-amp
C. The input voltage and frequency of the op-amp's DC power supply
D. The output voltage and smoothness of the op-amp's DC power supply
~~
E7G02 (D)
What is the effect of ringing in a filter?
A. An echo caused by a long time delay
B. A reduction in high frequency response
C. Partial cancellation of the signal over a range of frequencies
D. Undesired oscillations added to the desired signal
~~
E7G03 (D)
Which of the following is an advantage of using an op-amp instead of LC elements in
an audio filter?
A. Op-amps are more rugged
B. Op-amps are fixed at one frequency
C. Op-amps are available in more varieties than are LC elements
D. Op-amps exhibit gain rather than insertion loss
~~
E7G04 (C)
Which of the following is a type of capacitor best suited for use in high-stability
op-amp RC active filter circuits?
A. Electrolytic
B. Disc ceramic
C. Polystyrene
D. Paper
~~
E7G05 (A)
How can unwanted ringing and audio instability be prevented in a multi-section op-amp
RC audio filter circuit?
A. Restrict both gain and Q
B. Restrict gain, but increase Q
C. Restrict Q, but increase gain
D. Increase both gain and Q
~~
E7G06 (D)
Which of the following is the most appropriate use of an op-amp active filter?
A. As a high-pass filter used to block RFI at the input to receivers
B. As a low-pass filter used between a transmitter and a transmission line
C. For smoothing power-supply output
D. As an audio filter in a receiver
~~
E7G07 (C)
What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when
R1 is 10 ohms and RF is 470 ohms?
A. 0.21
B. 94
C. 47
D. 24
~~
E7G08 (D)
How does the gain of an ideal operational amplifier vary with frequency?
A. It increases linearly with increasing frequency
B. It decreases linearly with increasing frequency
C. It decreases logarithmically with increasing frequency
D. It does not vary with frequency
~~
E7G09 (D)
What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000
ohms, RF is 10,000 ohms, and 0.23 volts dc is applied to the input?
A.
B.
C.
D.
~~
0.23 volts
2.3 volts
-0.23 volts
-2.3 volts
E7G10 (C)
What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is
1800 ohms and RF is 68 kilohms?
A. 1
B. 0.03
C. 38
D. 76
~~
E7G11 (B)
What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is
3300 ohms and RF is 47 kilohms?
A. 28
B. 14
C. 7
D. 0.07
~~
E7G12 (A)
What is an integrated circuit operational amplifier?
A. A high-gain, direct-coupled differential amplifier with very high input and very
low output impedance
B. A digital audio amplifier whose characteristics are determined by components
external to the amplifier
C. An amplifier used to increase the average output of frequency modulated amateur
signals to the legal limit
D. An RF amplifier used in the UHF and microwave regions
~~
E7G13 (C)
What is meant by the term op-amp input-offset voltage?
A. The output voltage of the op-amp minus its input voltage
B. The difference between the output voltage of the op-amp and the input voltage
required in the immediately following stage
C. The differential input voltage needed to bring the open-loop output voltage to
zero
D. The potential between the amplifier input terminals of the op-amp in an open-loop
condition
~~
E7G14 (D)
What is the typical input impedance of an integrated circuit op-amp?
A. 100 ohms
B. 1000 ohms
C. Very low
D. Very high
~~
E7G15 (A)
What is the typical output impedance of an integrated circuit op-amp?
A. Very low
B. Very high
C. 100 ohms
D. 1000 ohms
~~
E7H Oscillators and signal sources: types of oscillators; synthesizers and phaselocked loops; direct digital synthesizers
E7H01 (D)
What are three oscillator circuits used in Amateur Radio equipment?
A. Taft, Pierce and negative feedback
B. Pierce, Fenner and Beane
C. Taft, Hartley and Pierce
D. Colpitts, Hartley and Pierce
~~
E7H02 (C)
What condition must exist for a circuit to oscillate?
A. It must have at least two stages
B. It must be neutralized
C. It must have positive feedback with a gain greater than 1
D. It must have negative feedback sufficient to cancel the input signal
~~
E7H03 (A)
How is positive feedback supplied in a Hartley oscillator?
A. Through a tapped coil
B. Through a capacitive divider
C. Through link coupling
D. Through a neutralizing capacitor
~~
E7H04 (C)
How is positive feedback supplied in a Colpitts oscillator?
A. Through a tapped coil
B. Through link coupling
C. Through a capacitive divider
D. Through a neutralizing capacitor
~~
E7H05 (D)
How is positive feedback supplied in a Pierce oscillator?
A. Through a tapped coil
B. Through link coupling
C. Through a neutralizing capacitor
D. Through a quartz crystal
~~
E7H06 (B)
Which of the following oscillator circuits are commonly used in VFOs?
A. Pierce and Zener
B. Colpitts and Hartley
C. Armstrong and deForest
D. Negative feedback and balanced feedback
~~
E7H07(C)
What is a magnetron oscillator?
A. An oscillator in which the output is fed back to the input by the magnetic field
of a transformer
B. A crystal oscillator in which variable frequency is obtained by placing the
crystal in a strong magnetic field
C. A UHF or microwave oscillator consisting of a diode vacuum tube with a specially
shaped anode, surrounded by an external magnet
D. A reference standard oscillator in which the oscillations are synchronized by
magnetic coupling to a rubidium gas tube
~~
E7H08 (A)
What is a Gunn diode oscillator?
A. An oscillator based on the negative resistance properties of properly-doped
semiconductors
B. An oscillator based on the argon gas diode
C. A highly stable reference oscillator based on the tee-notch principle
D. A highly stable reference oscillator based on the hot-carrier effect
~~
E7H09 (A)
What type of frequency synthesizer circuit uses a phase accumulator, lookup table,
digital to analog converter and a low-pass anti-alias filter?
A. A direct digital synthesizer
B. A hybrid synthesizer
C. A phase locked loop synthesizer
D. A diode-switching matrix synthesizer
~~
E7H10 (B)
What information is contained in the lookup table of a direct digital frequency
synthesizer?
A. The phase relationship between a reference oscillator and the output waveform
B. The amplitude values that represent a sine-wave output
C. The phase relationship between a voltage-controlled oscillator and the output
waveform
D. The synthesizer frequency limits and frequency values stored in the radio memories
~~
E7H11 (C)
What are the major spectral impurity components of direct digital synthesizers?
A. Broadband noise
B. Digital conversion noise
C. Spurious signals at discrete frequencies
D. Nyquist limit noise
~~
E7H12 (D)
Which of the following is a principal component of a direct digital synthesizer
(DDS)?
A. Phase splitter
B. Hex inverter
C. Chroma demodulator
D. Phase accumulator
~~
E7H13 (A)
What is the capture range of a phase-locked loop circuit?
A. The frequency range over which the circuit can lock
B. The voltage range over which the circuit can lock
C. The input impedance range over which the circuit can lock
D. The range of time it takes the circuit to lock
~~
E7H14 (C)
What is a phase-locked loop circuit?
A. An electronic servo loop consisting of a ratio detector, reactance modulator, and
voltage-controlled oscillator
B. An electronic circuit also known as a monostable multivibrator
C. An electronic servo loop consisting of a phase detector, a low-pass filter, a
voltage-controlled oscillator, and a stable reference oscillator
D. An electronic circuit consisting of a precision push-pull amplifier with a
differential input
~~
E7H15 (D)
Which of these functions can be performed by a phase-locked loop?
A. Wide-band AF and RF power amplification
B. Comparison of two digital input signals, digital pulse counter
C. Photovoltaic conversion, optical coupling
D. Frequency synthesis, FM demodulation
~~
E7H16 (B)
Why is the short-term stability of the reference oscillator important in the design
of a phase locked loop (PLL) frequency synthesizer?
A. Any amplitude variations in the reference oscillator signal will prevent the loop
from locking to the desired signal
B. Any phase variations in the reference oscillator signal will produce phase noise
in the synthesizer output
C. Any phase variations in the reference oscillator signal will produce harmonic
distortion in the modulating signal
D. Any amplitude variations in the reference oscillator signal will prevent the loop
from changing frequency
~~
E7H17 (C)
Why is a phase-locked loop often used as part of a variable frequency synthesizer for
receivers and transmitters?
A. It generates FM sidebands
B. It eliminates the need for a voltage controlled oscillator
C. It makes it possible for a VFO to have the same degree of frequency stability as a
crystal oscillator
D. It can be used to generate or demodulate SSB signals by quadrature phase
synchronization
~~
E7H18 (A)
What are the major spectral impurity components of phase-locked loop synthesizers?
A. Phase noise
B. Digital conversion noise
C. Spurious signals at discrete frequencies
D. Nyquist limit noise
~~
SUBELEMENT E8 - SIGNALS AND EMISSIONS [4 Exam Questions - 4 Groups]
E8A AC waveforms: sine, square, sawtooth and irregular waveforms; AC measurements;
average and PEP of RF signals; pulse and digital signal waveforms
E8A01 (A)
What type of wave is made up of a sine wave plus all of its odd harmonics?
A. A square wave
B. A sine wave
C. A cosine wave
D. A tangent wave
~~
E8A02 (C)
What type of wave has a rise time significantly faster than its fall time (or vice
versa)?
A. A cosine wave
B. A square wave
C. A sawtooth wave
D. A sine wave
~~
E8A03 (A)
What type of wave is made up of sine waves of a given fundamental frequency plus all
its harmonics?
A. A sawtooth wave
B. A square wave
C. A sine wave
D. A cosine wave
~~
E8A04 (C)
What is equivalent to the root-mean-square value of an AC voltage?
A. The AC voltage found by taking the square of the average value of the peak AC
voltage
B. The DC voltage causing the same amount of heating in a given resistor as the
corresponding peak AC voltage
C. The DC voltage causing the same amount of heating in a resistor as the
corresponding RMS AC voltage
D. The AC voltage found by taking the square root of the average AC value
~~
E8A05 (D)
What would be the most accurate way of measuring the RMS voltage of a complex
waveform?
A. By using a grid dip meter
B. By measuring the voltage with a D'Arsonval meter
C. By using an absorption wavemeter
D. By measuring the heating effect in a known resistor
~~
E8A06 (A)
What is the approximate ratio of PEP-to-average power in a typical single-sideband
phone signal?
A. 2.5 to 1
B. 25 to 1
C. 1 to 1
D. 100 to 1
~~
E8A07 (B)
What determines the PEP-to-average power ratio of a single-sideband phone signal?
A. The frequency of the modulating signal
B. The characteristics of the modulating signal
C. The degree of carrier suppression
D. The amplifier gain
~~
E8A08 (A)
What is the period of a wave?
A. The time required to complete one cycle
B. The number of degrees in one cycle
C. The number of zero crossings in one cycle
D. The amplitude of the wave
~~
E8A09 (C)
What type of waveform is produced by human speech?
A. Sinusoidal
B. Logarithmic
C. Irregular
D. Trapezoidal
~~
E8A10 (B)
Which of the following is a distinguishing characteristic of a pulse waveform?
A. Regular sinusoidal oscillations
B. Narrow bursts of energy separated by periods of no signal
C. A series of tones that vary between two frequencies
D. A signal that contains three or more discrete tones
~~
E8A11 (D)
What is one use for a pulse modulated signal?
A. Linear amplification
B. PSK31 data transmission
C. Multiphase power transmission
D. Digital data transmission
~~
E8A12 (D)
What type of information can be conveyed using digital waveforms?
A. Human speech
B. Video signals
C. Data
D. All of these choices are correct
~~
E8A13 (C)
What is an advantage of using digital signals instead of analog signals to convey the
same information?
A. Less complex circuitry is required for digital signal generation and detection
B. Digital signals always occupy a narrower bandwidth
C. Digital signals can be regenerated multiple times without error
D. All of these choices are correct
~~
E8A14 (A)
Which of these methods is commonly used to convert analog signals to digital signals?
A. Sequential sampling
B. Harmonic regeneration
C. Level shifting
D. Phase reversal
~~
E8A15 (B)
What would the waveform of a stream of digital data bits look like on a conventional
oscilloscope?
A. A series of sine waves with evenly spaced gaps
B. A series of pulses with varying patterns
C. A running display of alpha-numeric characters
D. None of the above; this type of signal cannot be seen on a conventional
oscilloscope
~~
E8B Modulation and demodulation: modulation methods; modulation index and deviation
ratio; pulse modulation; frequency and time division multiplexing
E8B01 (D)
What is the term for the ratio between the frequency deviation of an RF carrier wave,
and the modulating frequency of its corresponding FM-phone signal?
A. FM compressibility
B. Quieting index
C. Percentage of modulation
D. Modulation index
~~
E8B02 (D)
How does the modulation index of a phase-modulated emission vary with RF carrier
frequency (the modulated frequency)?
A. It increases as the RF carrier frequency increases
B. It decreases as the RF carrier frequency increases
C. It varies with the square root of the RF carrier frequency
D. It does not depend on the RF carrier frequency
~~
E8B03 (A)
What is the modulation index of an FM-phone signal having a maximum frequency
deviation of 3000 Hz either side of the carrier frequency, when the modulating
frequency is 1000 Hz?
A. 3
B. 0.3
C. 3000
D. 1000
~~
E8B04 (B)
What is the modulation index of an FM-phone signal having a maximum carrier deviation
of plus or minus 6 kHz when modulated with a 2-kHz modulating frequency?
A. 6000
B. 3
C. 2000
D. 1/3
~~
E8B05 (D)
What is the deviation ratio of an FM-phone signal having a maximum frequency swing of
plus-or-minus 5 kHz when the maximum modulation frequency is 3 kHz?
A. 60
B. 0.167
C. 0.6
D. 1.67
~~
E8B06 (A)
What is the deviation ratio of an FM-phone signal having a maximum frequency swing of
plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?
A. 2.14
B. 0.214
C. 0.47
D. 47
~~
E8B07 (A)
When using a pulse-width modulation system, why is the transmitter's peak power
greater than its average power?
A. The signal duty cycle is less than 100%
B. The signal reaches peak amplitude only when voice modulated
C. The signal reaches peak amplitude only when voltage spikes are generated within
the modulator
D. The signal reaches peak amplitude only when the pulses are also amplitude
modulated
~~
E8B08 (D)
What parameter does the modulating signal vary in a pulse-position modulation system?
A. The number of pulses per second
B. The amplitude of the pulses
C. The duration of the pulses
D. The time at which each pulse occurs
~~
E8B09 (B)
What is meant by deviation ratio?
A. The ratio of the audio modulating frequency to the center carrier frequency
B. The ratio of the maximum carrier frequency deviation to the highest audio
modulating frequency
C. The ratio of the carrier center frequency to the audio modulating frequency
D. The ratio of the highest audio modulating frequency to the average audio
modulating frequency
~~
E8B10 (C)
Which of these methods can be used to combine several separate analog information
streams into a single analog radio frequency signal?
A. Frequency shift keying
B. A diversity combiner
C. Frequency division multiplexing
D. Pulse compression
~~
E8B11 (B)
Which of the following describes frequency division multiplexing?
A. The transmitted signal jumps from band to band at a predetermined rate
B. Two or more information streams are merged into a "baseband", which then modulates
the transmitter
C. The transmitted signal is divided into packets of information
D. Two or more information streams are merged into a digital combiner, which then
pulse position modulates the transmitter
~~
E8B12 (B)
What is digital time division multiplexing?
A. Two or more data streams are assigned to discrete sub-carriers on an FM
transmitter
B. Two or more signals are arranged to share discrete time slots of a data
transmission
C. Two or more data streams share the same channel by transmitting time of
transmission as the sub-carrier
D. Two or more signals are quadrature modulated to increase bandwidth efficiency
~~
E8C Digital signals: digital communications modes; CW; information rate vs.
bandwidth; spread-spectrum communications; modulation methods
E8C01 (D)
Which one of the following digital codes consists of elements having unequal length?
A. ASCII
B. AX.25
C. Baudot
D. Morse code
~~
E8C02 (B)
What are some of the differences between the Baudot digital code and ASCII?
A. Baudot uses four data bits per character, ASCII uses seven or eight; Baudot uses
one character as a shift code, ASCII has no shift code
B. Baudot uses five data bits per character, ASCII uses seven or eight; Baudot uses
two characters as shift codes, ASCII has no shift code
C. Baudot uses six data bits per character, ASCII uses seven or eight; Baudot has no
shift code, ASCII uses two characters as shift codes
D. Baudot uses seven data bits per character, ASCII uses eight; Baudot has no shift
code, ASCII uses two characters as shift codes
~~
E8C03 (C)
What is one advantage of using the ASCII code for data communications?
A. It includes built-in error-correction features
B. It contains fewer information bits per character than any other code
C. It is possible to transmit both upper and lower case text
D. It uses one character as a shift code to send numeric and special characters
~~
E8C04 (C)
What technique is used to minimize the bandwidth requirements of a PSK31 signal?
A. Zero-sum character encoding
B. Reed-Solomon character encoding
C. Use of sinusoidal data pulses
D. Use of trapezoidal data pulses
~~
E8C05 (C)
What is the necessary bandwidth of a 13-WPM international Morse code transmission?
A. Approximately 13 Hz
B. Approximately 26 Hz
C. Approximately 52 Hz
D. Approximately 104 Hz
~~
E8C06 (C)
What is the necessary bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
A. 0.1 Hz
B. 0.3 kHz
C. 0.5 kHz
D. 1.0 kHz
~~
E8C07 (A)
What is the necessary bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM
transmission?
A. 15.36 kHz
B. 9.6 kHz
C. 4.8 kHz
D. 5.76 kHz
~~
E8C08 (D)
What term describes a wide-bandwidth communications system in which the transmitted
carrier frequency varies according to some predetermined sequence?
A. Amplitude compandored single sideband
B. AMTOR
C. Time-domain frequency modulation
D. Spread-spectrum communication
~~
E8C09 (A)
Which of these techniques causes a digital signal to appear as wide-band noise to a
conventional receiver?
A. Spread-spectrum
B. Independent sideband
C. Regenerative detection
D. Exponential addition
~~
E8C10 (A)
What spread-spectrum communications technique alters the center frequency of a
conventional carrier many times per second in accordance with a pseudo-random list of
channels?
A. Frequency hopping
B. Direct sequence
C. Time-domain frequency modulation
D. Frequency compandored spread-spectrum
~~
E8C11 (B)
What spread-spectrum communications technique uses a high speed binary bit stream to
shift the phase of an RF carrier?
A. Frequency hopping
B. Direct sequence
C. Binary phase-shift keying
D. Phase compandored spread-spectrum
~~
E8C12 (D)
What is the advantage of including a parity bit with an ASCII character stream?
A. Faster transmission rate
B. The signal can overpower interfering signals
C. Foreign language characters can be sent
D. Some types of errors can be detected
~~
E8C13 (B)
What is one advantage of using JT-65 coding?
A. Uses only a 65 Hz bandwidth
B. The ability to decode signals which have a very low signal to noise ratio
C. Easily copied by ear if necessary
D. Permits fast-scan TV transmissions over narrow bandwidth
~~
E8D Waveforms: measurement, peak-to-peak, RMS, average; Electromagnetic Waves:
definition, characteristics, polarization
E8D01 (A)
Which of the following is the easiest voltage amplitude parameter to measure when
viewing a pure sine wave signal on an analog oscilloscope?
A. Peak-to-peak voltage
B. RMS voltage
C. Average voltage
D. DC voltage
~~
E8D02 (B)
What is the relationship between the peak-to-peak voltage and the peak voltage
amplitude of a symmetrical waveform?
A. 0.707:1
B. 2:1
C. 1.414:1
D. 4:1
~~
E8D03 (A)
What input-amplitude parameter is valuable in evaluating the signal-handling
capability of a Class A amplifier?
A. Peak voltage
B. RMS voltage
C. Average power
D. Resting voltage
~~
E8D04 (B)
What is the PEP output of a transmitter that develops a peak voltage of 30 volts into
a 50-ohm load?
A. 4.5 watts
B. 9 watts
C. 16 watts
D. 18 watts
~~
E8D05 (D)
If an RMS-reading AC voltmeter reads 65 volts on a sinusoidal waveform, what is the
peak-to-peak voltage?
A. 46 volts
B. 92 volts
C. 130 volts
D. 184 volts
~~
E8D06 (B)
What is the advantage of using a peak-reading wattmeter to monitor the output of a
SSB phone transmitter?
A. It is easier to determine the correct tuning of the output circuit
B. It gives a more accurate display of the PEP output when modulation is present
C. It makes it easier to detect high SWR on the feed line
D. It can determine if any flat-topping is present during modulation peaks
~~
E8D07 (C)
What is an electromagnetic wave?
A. Alternating currents in the core of an electromagnet
B. A wave consisting of two electric fields at right angles to each other
C. A wave consisting of an electric field and a magnetic field oscillating at right
angles to each other
D. A wave consisting of two magnetic fields at right angles to each other
~~
E8D08 (D)
Which of the following best describes electromagnetic waves traveling in free space?
A. Electric and magnetic fields become aligned as they travel
B. The energy propagates through a medium with a high refractive index
C. The waves are reflected by the ionosphere and return to their source
D. Changing electric and magnetic fields propagate the energy
~~
E8D09 (B)
What is meant by circularly polarized electromagnetic waves?
A. Waves with an electric field bent into a circular shape
B. Waves with a rotating electric field
C. Waves that circle the Earth
D. Waves produced by a loop antenna
~~
E8D10 (D)
What type of meter should be used to monitor the output signal of a voice-modulated
single-sideband transmitter to ensure you do not exceed the maximum allowable power?
A. An SWR meter reading in the forward direction
B. A modulation meter
C. An average reading wattmeter
D. A peak-reading wattmeter
~~
E8D11 (A)
What is the average power dissipated by a 50-ohm resistive load during one complete
RF cycle having a peak voltage of 35 volts?
A. 12.2 watts
B. 9.9 watts
C. 24.5 watts
D. 16 watts
~~
E8D12 (D)
What is the peak voltage of a sinusoidal waveform if an RMS-reading voltmeter reads
34 volts?
A. 123 volts
B. 96 volts
C. 55 volts
D. 48 volts
~~
E8D13 (B)
Which of the following is a typical value for the peak voltage at a standard U.S.
household electrical outlet?
A. 240 volts
B. 170 volts
C. 120 volts
D. 340 volts
~~
E8D14 (C)
Which of the following is a typical value for the peak-to-peak voltage at a standard
U.S. household electrical outlet?
A. 240 volts
B. 120 volts
C. 340 volts
D. 170 volts
~~
E8D15 (A)
Which of the following is a typical value for the RMS voltage at a standard U.S.
household electrical power outlet?
A. 120V AC
B. 340V AC
C. 85V AC
D. 170V AC
~~
E8D16 (A)
What is the RMS value of a 340-volt peak-to-peak pure sine wave?
A. 120V AC
B. 170V AC
C. 240V AC
D. 300V AC
~~
SUBELEMENT E9 - ANTENNAS AND TRANSMISSION LINES [8 Exam Questions - 8 Groups]
E9A Isotropic and gain antennas: definitions; uses; radiation patterns; Basic antenna
parameters: radiation resistance and reactance, gain, beamwidth, efficiency
E9A01 (C)
Which of the following describes an isotropic antenna?
A. A grounded antenna used to measure earth conductivity
B. A horizontally polarized antenna used to compare Yagi antennas
C. A theoretical antenna used as a reference for antenna gain
D. A spacecraft antenna used to direct signals toward the earth
~~
E9A02 (B)
How much gain does a 1/2-wavelength dipole in free space have compared to an
isotropic antenna?
A. 1.55 dB
B. 2.15 dB
C. 3.05 dB
D. 4.30 dB
~~
E9A03 (D)
Which of the following antennas has no gain in any direction?
A. Quarter-wave vertical
B. Yagi
C. Half-wave dipole
D. Isotropic antenna
~~
E9A04 (A)
Why would one need to know the feed point impedance of an antenna?
A. To match impedances in order to minimize standing wave ratio on the transmission
line
B. To measure the near-field radiation density from a transmitting antenna
C. To calculate the front-to-side ratio of the antenna
D. To calculate the front-to-back ratio of the antenna
~~
E9A05 (B)
Which of the following factors may affect the feed point impedance of an antenna?
A. Transmission-line length
B. Antenna height, conductor length/diameter ratio and location of nearby conductive
objects
C. Constant feed point impedance
D. Sunspot activity and time of day
~~
E9A06 (D)
What is included in the total resistance of an antenna system?
A. Radiation resistance plus space impedance
B. Radiation resistance plus transmission resistance
C. Transmission-line resistance plus radiation resistance
D. Radiation resistance plus ohmic resistance
~~
E9A07 (C)
What is a folded dipole antenna?
A. A dipole one-quarter wavelength long
B. A type of ground-plane antenna
C. A dipole constructed from one wavelength of wire forming a very thin loop
D. A dipole configured to provide forward gain
~~
E9A08 (A)
What is meant by antenna gain?
A. The ratio relating the radiated signal strength of an antenna in the direction of
maximum radiation to that of a reference antenna
B. The ratio of the signal in the forward direction to that in the opposite direction
C. The ratio of the amount of power radiated by an antenna compared to the
transmitter output power
D. The final amplifier gain minus the transmission-line losses, including any phasing
lines present
~~
E9A09 (B)
What is meant by antenna bandwidth?
A. Antenna length divided by the number of elements
B. The frequency range over which an antenna satisfies a performance requirement
C. The angle between the half-power radiation points
D. The angle formed between two imaginary lines drawn through the element ends
~~
E9A10 (B)
How is antenna efficiency calculated?
A. (radiation resistance / transmission resistance) x 100%
B. (radiation resistance / total resistance) x 100%
C. (total resistance / radiation resistance) x 100%
D. (effective radiated power / transmitter output) x 100%
~~
E9A11 (A)
Which of the following choices is a way to improve the efficiency of a ground-mounted
quarter-wave vertical antenna?
A. Install a good radial system
B. Isolate the coax shield from ground
C. Shorten the radiating element
D. Reduce the diameter of the radiating element
~~
E9A12 (C)
Which of the following factors determines ground losses for a ground-mounted vertical
antenna operating in the 3-30 MHz range?
A. The standing-wave ratio
B. Distance from the transmitter
C. Soil conductivity
D. Take-off angle
~~
E9A13 (A)
How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6
dB gain over an isotropic antenna?
A. 3.85 dB
B. 6.0 dB
C. 8.15 dB
D. 2.79 dB
~~
E9A14 (B)
How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 12
dB gain over an isotropic antenna?
A. 6.17 dB
B. 9.85 dB
C. 12.5 dB
D. 14.15 dB
~~
E9A15 (C)
What is meant by the radiation resistance of an antenna?
A. The combined losses of the antenna elements and feed line
B. The specific impedance of the antenna
C. The value of a resistance that would dissipate the same amount of power as that
radiated from an antenna
D. The resistance in the atmosphere that an antenna must overcome to be able to
radiate a signal
~~
E9B Antenna patterns: E and H plane patterns; gain as a function of pattern; antenna
design (computer modeling of antennas); Yagi antennas
E9B01 (B)
In the antenna radiation pattern shown in Figure E9-1, what is the 3-dB beamwidth?
A. 75 degrees
B. 50 degrees
C. 25 degrees
D. 30 degrees
~~
E9B02 (B)
In the antenna radiation pattern shown in Figure E9-1, what is the front-to-back
ratio?
A. 36 dB
B. 18 dB
C. 24 dB
D. 14 dB
~~
E9B03 (B)
In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side
ratio?
A. 12 dB
B. 14 dB
C. 18 dB
D. 24 dB
~~
E9B04 (D)
What may occur when a directional antenna is operated at different frequencies within
the band for which it was designed?
A. Feed point impedance may become negative
B. The E-field and H-field patterns may reverse
C. Element spacing limits could be exceeded
D. The gain may change depending on frequency
~~
E9B05 (B)
What usually occurs if a Yagi antenna is designed solely for maximum forward gain?
A. The front-to-back ratio increases
B. The front-to-back ratio decreases
C. The frequency response is widened over the whole frequency band
D. The SWR is reduced
~~
E9B06 (A)
If the boom of a Yagi antenna is lengthened and the elements are properly retuned,
what usually occurs?
A. The gain increases
B. The SWR decreases
C. The front-to-back ratio increases
D. The gain bandwidth decreases rapidly
~~
E9B07 (C)
How does the total amount of radiation emitted by a directional gain antenna compare
with the total amount of radiation emitted from an isotropic antenna, assuming each
is driven by the same amount of power?
A. The total amount of radiation from the directional antenna is increased by the
gain of the antenna
B. The total amount of radiation from the directional antenna is stronger by its
front to back ratio
C. They are the same
D. The radiation from the isotropic antenna is 2.15 dB stronger than that from the
directional antenna
~~
E9B08 (A)
How can the approximate beamwidth in a given plane of a directional antenna be
determined?
A. Note the two points where the signal strength of the antenna is 3 dB less than
maximum and compute the angular difference
B. Measure the ratio of the signal strengths of the radiated power lobes from the
front and rear of the antenna
C. Draw two imaginary lines through the ends of the elements and measure the angle
between the lines
D. Measure the ratio of the signal strengths of the radiated power lobes from the
front and side of the antenna
~~
E9B09 (B)
What type of computer program technique is commonly used for modeling antennas?
A. Graphical analysis
B. Method of Moments
C. Mutual impedance analysis
D. Calculus differentiation with respect to physical properties
~~
E9B10 (A)
What is the principle of a Method of Moments analysis?
A. A wire is modeled as a series of segments, each having a uniform value of current
B. A wire is modeled as a single sine-wave current generator
C. A wire is modeled as a series of points, each having a distinct location in space
D. A wire is modeled as a series of segments, each having a distinct value of voltage
across it
~~
E9B11 (C)
What is a disadvantage of decreasing the number of wire segments in an antenna model
below the guideline of 10 segments per half-wavelength?
A. Ground conductivity will not be accurately modeled
B. The resulting design will favor radiation of harmonic energy
C. The computed feed point impedance may be incorrect
D. The antenna will become mechanically unstable
~~
E9B12 (D)
What is the far-field of an antenna?
A. The region of the ionosphere where radiated power is not refracted
B. The region where radiated power dissipates over a specified time period
C. The region where radiated field strengths are obstructed by objects of reflection
D. The region where the shape of the antenna pattern is independent of distance
E9B13 (B)
What does the abbreviation NEC stand for when applied to antenna modeling programs?
A. Next Element Comparison
B. Numerical Electromagnetics Code
C. National Electrical Code
D. Numeric Electrical Computation
~~
E9B14 (D)
What type of information can be obtained by submitting the details of a proposed new
antenna to a modeling program?
A. SWR vs. frequency charts
B. Polar plots of the far-field elevation and azimuth patterns
C. Antenna gain
D. All of these choices are correct
~~
E9C Wire and phased vertical antennas: beverage antennas; rhombic antennas; elevation
above real ground; ground effects as related to polarization; take-off angles
E9C01 (D)
What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2wavelength apart and fed 180 degrees out of phase?
A. A cardioid
B. Omnidirectional
C. A figure-8 broadside to the axis of the array
D. A figure-8 oriented along the axis of the array
~~
E9C02 (A)
What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4wavelength apart and fed 90 degrees out of phase?
A. A cardioid
B. A figure-8 end-fire along the axis of the array
C. A figure-8 broadside to the axis of the array
D. Omnidirectional
~~
E9C03 (C)
What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2wavelength apart and fed in phase?
A. Omnidirectional
B. A cardioid
C. A Figure-8 broadside to the axis of the array
D. A Figure-8 end-fire along the axis of the array
~~
E9C04 (B)
Which of the following describes a basic unterminated rhombic antenna?
A. Unidirectional; four-sides, each side one quarter-wavelength long; terminated in a
resistance equal to its characteristic impedance
B. Bidirectional; four-sides, each side one or more wavelengths long; open at the end
opposite the transmission line connection
C. Four-sides; an LC network at each corner except for the transmission connection;
D. Four-sides, each of a different physical length
~~
E9C05 (C)
What are the disadvantages of a terminated rhombic antenna for the HF bands?
A. The antenna has a very narrow operating bandwidth
B. The antenna produces a circularly polarized signal
C. The antenna requires a large physical area and 4 separate supports
D. The antenna is more sensitive to man-made static than any other type
~~
E9C06 (B)
What is the effect of a terminating resistor on a rhombic antenna?
A.
B.
C.
D.
~~
It
It
It
It
reflects the standing waves on the antenna elements back to the transmitter
changes the radiation pattern from bidirectional to unidirectional
changes the radiation pattern from horizontal to vertical polarization
decreases the ground loss
E9C07 (A)
What type of antenna pattern over real ground is shown in Figure E9-2?
A. Elevation
B. Azimuth
C. Radiation resistance
D. Polarization
~~
E9C08 (C)
What is the elevation angle of peak response in the antenna radiation pattern shown
in Figure E9-2?
A. 45 degrees
B. 75 degrees
C. 7.5 degrees
D. 25 degrees
~~
E9C09 (B)
What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?
A. 15 dB
B. 28 dB
C. 3 dB
D. 24 dB
~~
E9C10 (A)
How many elevation lobes appear in the forward direction of the antenna radiation
pattern shown in Figure E9-2?
A. 4
B. 3
C. 1
D. 7
~~
E9C11 (D)
How is the far-field elevation pattern of a vertically polarized antenna affected by
being mounted over seawater versus rocky ground?
A. The low-angle radiation decreases
B. The high-angle radiation increases
C. Both the high- and low-angle radiation decrease
D. The low-angle radiation increases
~~
E9C12 (D)
When constructing a Beverage antenna, which of the following factors should be
included in the design to achieve good performance at the desired frequency?
A. Its overall length must not exceed 1/4 wavelength
B. It must be mounted more than 1 wavelength above ground
C. It should be configured as a four-sided loop
D. It should be one or more wavelengths long
~~
E9C13 (C)
What is the main effect of placing a vertical antenna over an imperfect ground?
A. It causes increased SWR
B. It changes the impedance angle of the matching network
C. It reduces low-angle radiation
D. It reduces losses in the radiating portion of the antenna
~~
E9D Directional antennas: gain; satellite antennas; antenna beamwidth; stacking
antennas; antenna efficiency; traps; folded dipoles; shortened and mobile antennas;
grounding
E9D01 (C)
How does the gain of an ideal parabolic dish antenna change when the operating
frequency is doubled?
A. Gain does not change
B. Gain is multiplied by 0.707
C. Gain increases by 6 dB
D. Gain increases by 3 dB
~~
E9D02 (C)
How can linearly polarized Yagi antennas be used to produce circular polarization?
A. Stack two Yagis, fed 90 degrees out of phase, to form an array with the respective
elements in parallel planes
B. Stack two Yagis, fed in phase, to form an array with the respective elements in
parallel planes
C. Arrange two Yagis perpendicular to each other with the driven elements at the same
point on the boom and fed 90 degrees out of phase
D. Arrange two Yagis collinear to each other, with the driven elements fed 180
degrees out of phase
~~
E9D03 (D)
How does the beamwidth of an antenna vary as the gain is increased?
A. It increases geometrically
B. It increases arithmetically
C. It is essentially unaffected
D. It decreases
~~
E9D04 (A)
Why is it desirable for a ground-mounted satellite communications antenna system to
be able to move in both azimuth and elevation?
A. In order to track the satellite as it orbits the Earth
B. So the antenna can be pointed away from interfering signals
C. So the antenna can be positioned to cancel the effects of Faraday rotation
D. To rotate antenna polarization to match that of the satellite
~~
E9D05 (A)
Where should a high-Q loading coil be placed to minimize losses in a shortened
vertical antenna?
A. Near the center of the vertical radiator
B. As low as possible on the vertical radiator
C. As close to the transmitter as possible
D. At a voltage node
~~
E9D06 (C)
Why should an HF mobile antenna loading coil have a high ratio of reactance to
resistance?
A. To swamp out harmonics
B. To maximize losses
C. To minimize losses
D. To minimize the Q
~~
E9D07 (A)
What is a disadvantage of using a multiband trapped antenna?
A. It might radiate harmonics
B. It radiates the harmonics and fundamental equally well
C. It is too sharply directional at lower frequencies
D. It must be neutralized
~~
E9D08 (B)
What happens to the bandwidth of an antenna as it is shortened through the use of
loading coils?
A. It is increased
B. It is decreased
C. No change occurs
D. It becomes flat
~~
E9D09 (D)
What is an advantage of using top loading in a shortened HF vertical antenna?
A. Lower Q
B. Greater structural strength
C. Higher losses
D. Improved radiation efficiency
~~
E9D10 (A)
What is the approximate feed point impedance at the center of a two-wire folded
dipole antenna?
A. 300 ohms
B. 72 ohms
C. 50 ohms
D. 450 ohms
~~
E9D11 (D)
What is the function of a loading coil as used with an HF mobile antenna?
A. To increase the SWR bandwidth
B. To lower the losses
C. To lower the Q
D. To cancel capacitive reactance
~~
E9D12 (D)
What is one advantage of using a trapped antenna?
A. It has high directivity in the higher-frequency bands
B. It has high gain
C. It minimizes harmonic radiation
D. It may be used for multiband operation
~~
E9D13 (B)
What happens to feed point impedance at the base of a fixed-length
as the frequency of operation is lowered?
A. The radiation resistance decreases and the capacitive reactance
B. The radiation resistance decreases and the capacitive reactance
C. The radiation resistance increases and the capacitive reactance
D. The radiation resistance increases and the capacitive reactance
~~
HF mobile antenna
decreases
increases
decreases
increases
E9D14 (B)
Which of the following types of conductor would be best for minimizing losses in a
station's RF ground system?
A. A resistive wire, such as a spark plug wire
B. A wide flat copper strap
C. A cable with 6 or 7 18-gauge conductors in parallel
D. A single 12 or 10-gauge stainless steel wire
~~
E9D15 (C)
Which of the following would provide the
A. A 50-ohm resistor connected to ground
B. An electrically-short connection to a
C. An electrically-short connection to 3
the Earth
D. An electrically-short connection to 3
RF choke
~~
best RF ground for your station?
metal water pipe
or 4 interconnected ground rods driven into
or 4 interconnected ground rods via a series
E9E Matching: matching antennas to feed lines; power dividers
E9E01 (B)
What system matches a high-impedance transmission line to a lower impedance antenna
by connecting the line to the driven element in two places spaced a fraction of a
wavelength each side of element center?
A. The gamma matching system
B. The delta matching system
C. The omega matching system
D. The stub matching system
~~
E9E02 (A)
What is the name of an antenna matching system that matches an unbalanced feed line
to an antenna by feeding the driven element both at the center of the element and at
a fraction of a wavelength to one side of center?
A. The gamma match
B. The delta match
C. The epsilon match
D. The stub match
~~
E9E03 (D)
What is the name of the matching system that uses a section of transmission line
connected in parallel with the feed line at or near the feed point?
A. The gamma match
B. The delta match
C. The omega match
D. The stub match
~~
E9E04 (B)
What is the purpose of the series capacitor in a gamma-type antenna matching network?
A. To provide DC isolation between the feed line and the antenna
B. To cancel the inductive reactance of the matching network
C. To provide a rejection notch to prevent the radiation of harmonics
D. To transform the antenna impedance to a higher value
~~
E9E05 (A)
How must the driven element in a 3-element Yagi be tuned to use a hairpin matching
system?
A. The driven element reactance must be capacitive
B. The driven element reactance must be inductive
C. The driven element resonance must be lower than the operating frequency
D. The driven element radiation resistance must be higher than the characteristic
impedance of the transmission line
~~
E9E06 (C)
What is the equivalent lumped-constant network for a hairpin matching system on a
3-element Yagi?
A. Pi network
B. Pi-L network
C. L network
D. Parallel-resonant tank
~~
E9E07 (B)
What term best describes the interactions at the load end of a mismatched
transmission line?
A. Characteristic impedance
B. Reflection coefficient
C. Velocity factor
D. Dielectric constant
~~
E9E08 (D)
Which of the following measurements is characteristic of a mismatched transmission
line?
A. An SWR less than 1:1
B. A reflection coefficient greater than 1
C. A dielectric constant greater than 1
D. An SWR greater than 1:1
~~
E9E09 (C)
Which of these matching systems is an effective method of connecting a 50-ohm coaxial
cable feed line to a grounded tower so it can be used as a vertical antenna?
A. Double-bazooka match
B. Hairpin match
C. Gamma match
D. All of these choices are correct
~~
E9E10 (C)
Which of these choices is an effective way to match an antenna with a 100-ohm feed
point impedance to a 50-ohm coaxial cable feed line?
A. Connect a 1/4-wavelength open stub of 300-ohm twin-lead in parallel with the
coaxial feed line where it connects to the antenna
B. Insert a 1/2 wavelength piece of 300-ohm twin-lead in series between the antenna
terminals and the 50-ohm feed cable
C. Insert a 1/4-wavelength piece of 75-ohm coaxial cable transmission line in series
between the antenna terminals and the 50-ohm feed cable
D. Connect 1/2 wavelength shorted stub of 75-ohm cable in parallel with the 50-ohm
cable where it attaches to the antenna
~~
E9E11 (B)
What is an effective way of matching a feed line to a VHF or UHF antenna when the
impedances of both the antenna and feed line are unknown?
A. Use a 50-ohm 1:1 balun between the antenna and feed line
B. Use the universal stub matching technique
C. Connect a series-resonant LC network across the antenna feed terminals
D. Connect a parallel-resonant LC network across the antenna feed terminals
~~
E9E12 (A)
What is the primary purpose of a phasing line when used with an antenna having
multiple driven elements?
A. It ensures that each driven element operates in concert with the others to create
the desired antenna pattern
B. It prevents reflected power from traveling back down the feed line and causing
harmonic radiation from the transmitter
C. It allows single-band antennas to operate on other bands
D. It makes sure the antenna has a low-angle radiation pattern
~~
E9E13 (C)
What is the purpose of a Wilkinson divider?
A. It divides the operating frequency of a transmitter signal so it can be used on a
lower frequency band
B. It is used to feed high-impedance antennas from a low-impedance source
C. It divides power equally among multiple loads while preventing changes in one load
from disturbing power flow to the others
D. It is used to feed low-impedance loads from a high-impedance source
~~
E9F Transmission lines: characteristics of open and shorted feed lines; 1/8
wavelength; 1/4 wavelength; 1/2 wavelength; feed lines: coax versus open-wire;
velocity factor; electrical length; coaxial cable dielectrics; velocity factor
E9F01 (D)
What is the velocity factor of a transmission line?
A. The ratio of the characteristic impedance of the line to the terminating impedance
B. The index of shielding for coaxial cable
C. The velocity of the wave in the transmission line multiplied by the velocity of
light in a vacuum
D. The velocity of the wave in the transmission line divided by the velocity of light
in a vacuum
~~
E9F02 (C)
Which of the following determines the velocity factor of a transmission line?
A. The termination impedance
B. The line length
C. Dielectric materials used in the line
D. The center conductor resistivity
~~
E9F03 (D)
Why is the physical length of a coaxial cable transmission line shorter than its
electrical length?
A. Skin effect is less pronounced in the coaxial cable
B. The characteristic impedance is higher in a parallel feed line
C. The surge impedance is higher in a parallel feed line
D. Electrical signals move more slowly in a coaxial cable than in air
~~
E9F04 (B)
What is the typical velocity factor for a coaxial cable with solid polyethylene
dielectric?
A. 2.70
B. 0.66
C. 0.30
D. 0.10
~~
E9F05 (C)
What is the approximate physical length of a solid polyethylene dielectric coaxial
transmission line that is electrically one-quarter wavelength long at 14.1 MHz?
A. 20 meters
B. 2.3 meters
C. 3.5 meters
D. 0.2 meters
~~
E9F06 (C)
What is the approximate physical length of an air-insulated, parallel conductor
transmission line that is electrically one-half wavelength long at 14.10 MHz?
A. 15 meters
B. 20 meters
C. 10 meters
D. 71 meters
~~
E9F07 (A)
How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?
A. Lower loss
B. Higher SWR
C. Smaller reflection coefficient
D. Lower velocity factor
~~
E9F08 (A)
What is the term for the ratio of the actual speed at which a signal travels through
a transmission line to the speed of light in a vacuum?
A. Velocity factor
B. Characteristic impedance
C. Surge impedance
D. Standing wave ratio
~~
E9F09 (B)
What is the approximate physical length of a solid polyethylene dielectric coaxial
transmission line that is electrically one-quarter wavelength long at 7.2 MHz?
A. 10 meters
B. 6.9 meters
C. 24 meters
D. 50 meters
~~
E9F10 (C)
What impedance does a 1/8-wavelength transmission line present to a generator when
the line is shorted at the far end?
A. A capacitive reactance
B. The same as the characteristic impedance of the line
C. An inductive reactance
D. The same as the input impedance to the final generator stage
~~
E9F11 (C)
What impedance does a 1/8-wavelength transmission line present to a generator when
the line is open at the far end?
A. The same as the characteristic impedance of the line
B. An inductive reactance
C. A capacitive reactance
D. The same as the input impedance of the final generator stage
~~
E9F12 (D)
What impedance does a 1/4-wavelength transmission line present to a generator when
the line is open at the far end?
A. The same as the characteristic impedance of the line
B. The same as the input impedance to the generator
C. Very high impedance
D. Very low impedance
~~
E9F13 (A)
What impedance does a 1/4-wavelength transmission line present to a generator when
the line is shorted at the far end?
A. Very high impedance
B. Very low impedance
C. The same as the characteristic impedance of the transmission line
D. The same as the generator output impedance
~~
E9F14 (B)
What impedance does a 1/2-wavelength transmission line present to a generator when
the line is shorted at the far end?
A. Very high impedance
B. Very low impedance
C. The same as the characteristic impedance of the line
D. The same as the output impedance of the generator
~~
E9F15 (A)
What impedance does a 1/2-wavelength transmission line present to a generator when
the line is open at the far end?
A. Very high impedance
B. Very low impedance
C. The same as the characteristic impedance of the line
D. The same as the output impedance of the generator
~~
E9F16 (D)
Which of the following is a significant difference between foam-dielectric coaxial
cable and solid-dielectric cable, assuming all other parameters are the same?
A. Reduced safe operating voltage limits
B. Reduced losses per unit of length
C. Higher velocity factor
D. All of these choices are correct
~~
E9G The Smith chart
E9G01 (A)
Which of the following can be calculated using a Smith chart?
A. Impedance along transmission lines
B. Radiation resistance
C. Antenna radiation pattern
D. Radio propagation
~~
E9G02 (B)
What type of coordinate system is used in a Smith chart?
A. Voltage circles and current arcs
B. Resistance circles and reactance arcs
C. Voltage lines and current chords
D. Resistance lines and reactance chords
~~
E9G03 (C)
Which of the following is often determined using a Smith chart?
A. Beam headings and radiation patterns
B. Satellite azimuth and elevation bearings
C. Impedance and SWR values in transmission lines
D. Trigonometric functions
~~
E9G04 (C)
What are the two families of circles and arcs that make up a Smith chart?
A. Resistance and voltage
B. Reactance and voltage
C. Resistance and reactance
D. Voltage and impedance
~~
E9G05 (A)
What type of chart is shown in Figure E9-3?
A. Smith chart
B. Free-space radiation directivity chart
C. Elevation angle radiation pattern chart
D. Azimuth angle radiation pattern chart
~~
E9G06 (B)
On the Smith chart shown in Figure E9-3, what is the name for the large outer circle
on which the reactance arcs terminate?
A. Prime axis
B. Reactance axis
C. Impedance axis
D. Polar axis
~~
E9G07 (D)
On the Smith chart shown in Figure E9-3, what is the only straight line shown?
A. The reactance axis
B. The current axis
C. The voltage axis
D. The resistance axis
~~
E9G08 (C)
What is the process of normalization with regard to a Smith chart?
A. Reassigning resistance values with regard to the reactance axis
B. Reassigning reactance values with regard to the resistance axis
C. Reassigning impedance values with regard to the prime center
D. Reassigning prime center with regard to the reactance axis
~~
E9G09 (A)
What third family of circles is often added to a Smith chart during the process of
solving problems?
A. Standing-wave ratio circles
B. Antenna-length circles
C. Coaxial-length circles
D. Radiation-pattern circles
~~
E9G10 (D)
What do the arcs on a Smith chart represent?
A. Frequency
B. SWR
C. Points with constant resistance
D. Points with constant reactance
~~
E9G11 (B)
How are the wavelength scales on a Smith chart calibrated?
A. In fractions of transmission line electrical frequency
B. In fractions of transmission line electrical wavelength
C. In fractions of antenna electrical wavelength
D. In fractions of antenna electrical frequency
~~
E9H Effective radiated power; system gains and losses; radio direction finding
antennas
E9H01 (D)
What is the effective radiated power relative to a dipole of a repeater station with
150 watts transmitter power output, 2-dB feed line loss, 2.2-dB duplexer loss and 7dBd antenna gain?
A. 1977 watts
B. 78.7 watts
C. 420 watts
D. 286 watts
~~
E9H02 (A)
What is the effective radiated power relative to a dipole of a repeater station with
200 watts transmitter power output, 4-dB feed line loss, 3.2-dB duplexer loss, 0.8-dB
circulator loss and 10-dBd antenna gain?
A. 317 watts
B. 2000 watts
C. 126 watts
D. 300 watts
~~
E9H03 (B)
What is the effective isotropic radiated power of a repeater station with 200 watts
transmitter power output, 2-dB feed line loss, 2.8-dB duplexer loss, 1.2-dB
circulator loss and 7-dBi antenna gain?
A. 159 watts
B. 252 watts
C. 632 watts
D. 63.2 watts
~~
E9H04 (C)
What term describes station output, including the transmitter, antenna and everything
in between, when considering transmitter power and system gains and losses?
A. Power factor
B. Half-power bandwidth
C. Effective radiated power
D. Apparent power
~~
E9H05 (A)
What is the main drawback of a wire-loop antenna for direction finding?
A. It has a bidirectional pattern
B. It is non-rotatable
C. It receives equally well in all directions
D. It is practical for use only on VHF bands
~~
E9H06 (C)
What is the triangulation method of direction finding?
A. The geometric angle of sky waves from the source are used to determine its
position
B. A fixed receiving station plots three headings from the signal source on a map
C. Antenna headings from several different receiving locations are used to locate the
signal source
D. A fixed receiving station uses three different antennas to plot the location of
the signal source
~~
E9H07 (D)
Why is it advisable to use an RF attenuator on a receiver being used for direction
finding?
A. It narrows the bandwidth of the received signal to improve signal to noise ratio
B. It compensates for the effects of an isotropic antenna, thereby improving
directivity
C. It reduces loss of received signals caused by antenna pattern nulls, thereby
increasing sensitivity
D. It prevents receiver overload which could make it difficult to determine peaks or
nulls
~~
E9H08 (A)
What is the function of a sense antenna?
A. It modifies the pattern of a DF antenna array to provide a null in one direction
B. It increases the sensitivity of a DF antenna array
C. It allows DF antennas to receive signals at different vertical angles
D. It provides diversity reception that cancels multipath signals
~~
E9H09 (C)
Which of the following describes the construction of a receiving loop antenna?
A. A large circularly-polarized antenna
B. A small coil of wire tightly wound around a toroidal ferrite core
C. One or more turns of wire wound in the shape of a large open coil
D. A vertical antenna coupled to a feed line through an inductive loop of wire
~~
E9H10 (D)
How can the output voltage of a multi-turn receiving loop antenna be increased?
A. By reducing the permeability of the loop shield
B. By increasing the number of wire turns in the loop and reducing the area of the
loop structure
C. By winding adjacent turns in opposing directions
D. By increasing either the number of wire turns in the loop or the area of the loop
structure or both
~~
E9H11 (B)
What characteristic of a cardioid-pattern antenna is useful for direction finding?
A. A very sharp peak
B. A very sharp single null
C. Broad band response
D. High-radiation angle
~~
E9H12 (B)
What is an advantage of using a shielded loop antenna for direction finding?
A. It automatically cancels ignition noise pickup in mobile installations
B. It is electro-statically balanced against ground, giving better nulls
C. It eliminates tracking errors caused by strong out-of-band signals
D. It allows stations to communicate without giving away their position
~~
SUBELEMENT E0 – SAFETY - [1 exam question -– 1 group]
E0A Safety: amateur radio safety practices; RF radiation hazards; hazardous materials
E0A01 (C)
What, if any, are the differences between the radiation produced by radioactive
materials and the electromagnetic energy radiated by an antenna?
A. There is no significant difference between the two types of radiation
B. Only radiation produced by radioactivity can injure human beings
C. Radioactive materials emit ionizing radiation, while RF signals have less energy
and can only cause heating
D. Radiation from an antenna will damage unexposed photographic film but ordinary
radioactive materials do not cause this problem
~~
E0A02 (B)
When evaluating RF exposure levels from your station at a neighbor’s home, what must
you do?
A. Make sure signals from your station are less than the controlled MPE limits
B. Make sure signals from your station are less than the uncontrolled MPE limits
C. You need only evaluate exposure levels on your own property
D. Advise your neighbors of the results of your tests
~~
E0A03 (C)
Which of the following would be a practical way to estimate whether the RF fields
produced by an amateur radio station are within permissible MPE limits?
A. Use a calibrated antenna analyzer
B. Use a hand calculator plus Smith-chart equations to calculate the fields
C. Use an antenna modeling program to calculate field strength at accessible
locations
D. All of the choices are correct
~~
E0A04 (C)
When evaluating a site with multiple transmitters operating at the same time, the
operators and licensees of which transmitters are responsible for mitigating overexposure situations?
A. Only the most powerful transmitter
B. Only commercial transmitters
C. Each transmitter that produces 5% or more of its MPE exposure limit at accessible
locations
D. Each transmitter operating with a duty-cycle greater than 50%
~~
E0A05 (B)
What is one of the potential hazards of using microwaves in the amateur radio bands?
A. Microwaves are ionizing radiation
B. The high gain antennas commonly used can result in high exposure levels
C. Microwaves often travel long distances by ionospheric reflection
D. The extremely high frequency energy can damage the joints of antenna structures
~~
E0A06 (D)
Why are there separate electric (E) and magnetic (H) field MPE limits?
A. The body reacts to electromagnetic radiation from both the E and H fields
B. Ground reflections and scattering make the field impedance vary with location
C. E field and H field radiation intensity peaks can occur at different locations
D. All of these choices are correct
~~
E0A07 (B)
How may dangerous levels of carbon monoxide from an emergency generator be detected?
A. By the odor
B. Only with a carbon monoxide detector
C. Any ordinary smoke detector can be used
D. By the yellowish appearance of the gas
~~
E0A08 (C)
What does SAR measure?
A. Synthetic Aperture Ratio of the human body
B. Signal Amplification Rating
C. The rate at which RF energy is absorbed by the body
D. The rate of RF energy reflected from stationary terrain
~~
E0A09 (C)
Which insulating material commonly used as a thermal conductor for some types of
electronic devices is extremely toxic if broken or crushed and the particles are
accidentally inhaled?
A. Mica
B. Zinc oxide
C. Beryllium Oxide
D. Uranium Hexaflouride
~~
E0A10 (A)
What material found in some electronic components such as high-voltage capacitors and
transformers is considered toxic?
A. Polychlorinated biphenyls
B. Polyethylene
C. Polytetrafluroethylene
D. Polymorphic silicon
~~
E0A11 (C)
Which of the following injuries can result from using high-power UHF or microwave
transmitters?
A. Hearing loss caused by high voltage corona discharge
B. Blood clotting from the intense magnetic field
C. Localized heating of the body from RF exposure in excess of the MPE limits
D. Ingestion of ozone gas from the cooling system
~~
~~end of question pool text~~
NOTE: The graphics required for certain questions in sections E5, E6, E7, and E9 are
included on the following pages:
Figure E5-2
Figure E6-1
Point 3
Point 2
Point 8
Point 5
1
2
3
4
5
6
Point 6
Point 4
Point 1
Point 7
Figure E6-3
Figure E6-2
2
4
5
2
5
6
3
7
Figure E7-1
Figure E6-5
1
1
3
6
4
8
Figure E7-2
Figure E7- 3
Q1
+25
+12
C1
C1
4000
C3
0.01
R1
R2
C2
C2
4000
R
D1
Figure E9-1
Figure E7-4
120
RF
150
-3
-6
60
Free-Space
Pattern
30
-12
R1
-24
180
0
-30
-150
-120
Figure E9-2
90
120
Figure E9-3
Over Real Ground
60
150
180
30
-40 -30 -20
-60
-10
0
~~~ end of question pool ~~~
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