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US Amateur Radio - Amateur Extra (Element 4, 2020-2024) Practice Test

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1. - E0A02

When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

SelectAnswer
AEnsure signals from your station are less than the controlled Maximum Permitted Emission (MPE) limits
BEnsure signals from your station are less than the controlled Maximum Permitted Exposure (MPE) limits
CEnsure signals from your station are less than the uncontrolled Maximum Permitted Exposure (MPE) limits
DEnsure signals from your station are less than the uncontrolled Maximum Permitted Emission (MPE) limits

2. - E1A01

Which of the following carrier frequencies is illegal for LSB AFSK emissions on the 17 meter band RTTY and data segment of 18.068 to 18.110 MHz?

SelectAnswer
A18.107 MHz
B18.068 MHz
C18.110 MHz
D18.100 MHz

3. - E1B04

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 Historic Places?

SelectAnswer
AAn Environmental Assessment must be submitted to the FCC
BA proposal must be submitted to the National Park Service
CA letter of intent must be filed with the Environmental Protection Agency
DA form FSD-15 must be submitted to the Department of the Interior

4. - E1C03

How do the control operator responsibilities of a station under automatic control differ from one under local control?

SelectAnswer
AUnder local control there is no control operator
BUnder automatic control there is no control operator
CUnder local control a control operator is not required to be present at a control point
DUnder automatic control the control operator is not required to be present at the control point

5. - E1D12

Which of the following amateur stations may transmit one-way communications?

SelectAnswer
AA message forwarding station or automatically controlled digital station
BAll these choices are correct
CA local repeater or linked repeater station
DA space station, beacon station, or telecommand station

6. - E1E07

What should a VE do if a candidate fails to comply with the examiner's instructions during an amateur operator license examination?

SelectAnswer
AImmediately terminate everyone's examination and close the session
BImmediately terminate the candidate's examination
CAllow the candidate to complete the examination, but invalidate the results
DWarn the candidate that continued failure to comply will result in termination of the examination

7. - E1F02

What privileges are authorized in the U.S. to persons holding an amateur service license granted by the government of Canada?

SelectAnswer
AFull privileges, up to and including those of the Amateur Extra Class license, on the 80, 40, 20, 15, and 10 meter bands
BThe operating terms and conditions of the Canadian amateur service license, not to exceed U.S. Amateur Extra Class license privileges
CAll privileges of the Amateur Extra Class license
DNone, they must obtain a U.S. license

8. - E2A11

What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

SelectAnswer
AA circularly polarized antenna
BAn isotropic antenna
CA log-periodic dipole array
DA linearly polarized antenna

9. - E2B12

What signals SSTV receiving software to begin a new picture line?

SelectAnswer
ASpecific tone frequencies
BA two-tone signal
CSpecific tone amplitudes
DElapsed time

10. - E2C03

From which of the following bands is amateur radio contesting generally excluded?

SelectAnswer
A30 meters
B6 meters
C33 centimeters
D2 meters

11. - E2D06

Which of the following describes a method of establishing EME contacts?

SelectAnswer
AStoring and forwarding digital messages
BTime synchronous transmissions alternately from each station
CHigh-speed CW identification to avoid fading
DJudging optimum transmission times by monitoring beacons reflected from the moon

12. - E2E13

Which of these digital modes has the fastest data throughput under clear communication conditions?

SelectAnswer
APSK31
BAMTOR
C170 Hz shift, 45 baud RTTY
D300 baud packet

13. - E3A07

Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

SelectAnswer
AUrban areas
BBodies of water
CMountain ranges
DForests

14. - E3B04

What is meant by the terms "extraordinary" and "ordinary" waves?

SelectAnswer
ARefracted rays and reflected waves
BLong-path and short-path waves
CIndependent waves created in the ionosphere that are elliptically polarized
DExtraordinary waves describe rare long-skip propagation compared to ordinary waves, which travel shorter distances

15. - E3C03

Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?

SelectAnswer
ATransequatorial
BNVIS
CPolar
DSporadic E

16. - E4A07

Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

SelectAnswer
AAntenna analyzers automatically tune your antenna for resonance
BAntenna analyzers display a time-varying representation of the modulation envelope
CAll these choices are correct
DAntenna analyzers do not need an external RF source

17. - E4B01

Which of the following factors most affects the accuracy of a frequency counter?

SelectAnswer
ADecade divider accuracy
BTemperature coefficient of the logic
CInput attenuator accuracy
DTime base accuracy

18. - E4C06

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?

SelectAnswer
A-174 dBm
B-164 dBm
C-155 dBm
D-148 dBm

19. - E4D05

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?

SelectAnswer
A146.34 MHz and 146.61 MHz
B146.10 MHz and 147.30 MHz
C173.35 MHz and 139.40 MHz
D146.88 MHz and 146.34 MHz

20. - E4E02

Which of the following types of noise can often be reduced with a digital signal processing noise filter?

SelectAnswer
APower line noise
BAll these choices are correct
CBroadband white noise
DIgnition noise

21. - E5A08

What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

SelectAnswer
AThe voltage and current are 180 degrees out of phase
BThe voltage and current are in phase
CThe current leads the voltage by 90 degrees
DThe voltage leads the current by 90 degrees

22. - E5B05

What happens to the magnitude of a pure reactance when it is converted to a susceptance?

SelectAnswer
AIt is shifted by 90 degrees
BThe sign is reversed
CIt is unchanged
DIt becomes the reciprocal

23. - E5C10

Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 400-ohm resistor and a 38-picofarad capacitor at 14 MHz?

SelectAnswer
APoint 2
BPoint 4
CPoint 6
DPoint 5

24. - E5D14

What is reactive power?

SelectAnswer
APower lost because of capacitor leakage
BPower consumed in wire resistance in an inductor
CPower consumed in circuit Q
DWattless, nonproductive power

25. - E6A09

What is a depletion-mode FET?

SelectAnswer
AAny FET for which holes are the majority carriers
BAn FET that has no current flow between source and drain when no gate voltage is applied
CAn FET that exhibits a current flow between source and drain when no gate voltage is applied
DAny FET without a channel

26. - E6B01

What is the most useful characteristic of a Zener diode?

SelectAnswer
AA constant voltage drop under conditions of varying current
BA negative resistance region
CAn internal capacitance that varies with the applied voltage
DA constant current drop under conditions of varying voltage

27. - E6C04

Which of the following is an advantage of BiCMOS logic?

SelectAnswer
AIts simplicity results in much less expensive devices than standard CMOS
BAll these choices are correct
CIt is immune to electrostatic damage
DIt has the high input impedance of CMOS and the low output impedance of bipolar transistors

28. - E6D05

What is one reason for using ferrite cores rather than powdered iron in an inductor?

SelectAnswer
AFerrite toroids generally require fewer turns to produce a given inductance value
BFerrite toroids generally have better temperature stability
CFerrite toroids generally have lower initial permeability
DFerrite toroids are easier to use with surface mount technology

29. - E6E08

How is power supplied to the most common type of MMIC?

SelectAnswer
AThrough a resistor and/or RF choke connected to the amplifier output lead
BThrough a capacitor and RF choke connected to the amplifier input lead
CDirectly to the bias voltage (VCC IN) lead
DMMICs require no operating bias

30. - E6F07

What is a solid-state relay?

SelectAnswer
AA semiconductor passive delay line
BA mechanical relay that latches in the on or off state each time it is pulsed
CA relay using transistors to drive the relay coil
DA device that uses semiconductors to implement the functions of an electromechanical relay

31. - E7A08

What logical operation does an OR gate perform?

SelectAnswer
AIt only produces logic 0 at its output when all inputs are logic 1
BIt produces logic 1 at its output if any or all inputs are logic 1
CIt produces logic 1 at its output if all inputs are logic 0
DIt produces logic 0 at its output if all inputs are logic 1

32. - E7B08

How can an RF power amplifier be neutralized?

SelectAnswer
ABy feeding an in-phase component of the output back to the input
BBy feeding a 180-degree out-of-phase portion of the output back to the input
CBy increasing the driving power
DBy reducing the driving power

33. - E7C06

What are the distinguishing features of an elliptical filter?

SelectAnswer
AExtremely flat response over its pass band with gradually rounded stop band corners
BGradual passband rolloff with extreme stop band ripple
CExtremely sharp cutoff with one or more notches in the stop band
DGradual passband rolloff with minimal stop band ripple

34. - E7D14

What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?

SelectAnswer
AAll these choices are correct
BDischarge the capacitors when voltage is removed
CEqualize the voltage across each capacitor
DProvide a minimum load on the supply

35. - E7E04

What is one way a single-sideband phone signal can be generated?

SelectAnswer
ABy using a reactance modulator followed by a mixer
BBy driving a product detector with a DSB signal
CBy using a balanced modulator followed by a filter
DBy using a loop modulator followed by a mixer

36. - E7F05

How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?

SelectAnswer
AAt four times the rate of the highest frequency component of the signal
BAt least twice the rate of the highest frequency component of the signal
CAt the same rate as the highest frequency component of the signal
DAt least half the rate of the highest frequency component of the signal

37. - E7G04

What is meant by the "op-amp input offset voltage"?

SelectAnswer
AThe potential between the amplifier input terminals of the op-amp in an open loop condition
BThe difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
CThe differential input voltage needed to bring the open loop output voltage to zero
DThe output voltage of the op-amp minus its input voltage

38. - E7H09

What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?

SelectAnswer
AA direct digital synthesizer
BA hybrid synthesizer
CA phase-locked loop synthesizer
DA diode-switching matrix synthesizer

39. - E8A02

Which of the following is a type of analog-to-digital conversion?

SelectAnswer
ASuccessive approximation
BLevel shifting
CPhase reversal
DHarmonic regeneration

40. - E8B09

What is deviation ratio?

SelectAnswer
AThe ratio of the maximum carrier frequency deviation to the highest audio modulating frequency
BThe ratio of the audio modulating frequency to the center carrier frequency
CThe ratio of the carrier center frequency to the audio modulating frequency
DThe ratio of the highest audio modulating frequency to the average audio modulating frequency

41. - E8C06

What is the bandwidth of a 170-hertz shift, 300-baud ASCII transmission?

SelectAnswer
A0.3 kHz
B0.1 Hz
C1.0 kHz
D0.5 kHz

42. - E8D06

What is the advantage of including parity bits in ASCII characters?

SelectAnswer
ASome types of errors can be detected
BThe signal can overpower interfering signals
CForeign language characters can be sent
DFaster transmission rate

43. - E9A09

What is antenna efficiency?

SelectAnswer
ARadiation resistance divided by total resistance
BRadiation resistance divided by transmission resistance
CEffective radiated power divided by transmitter output
DTotal resistance divided by radiation resistance

44. - E9B05

What type of antenna pattern is shown in Figure E9-2?

SelectAnswer
APolarization
BRadiation resistance
CAzimuth
DElevation

45. - E9C04

What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?

SelectAnswer
AThe lobes become more perpendicular to the wire
BThe lobes align more in the direction of the wire
CThe vertical angle increases
DThe front-to-back ratio decreases

46. - E9D09

What is the function of a loading coil used as part of an HF mobile antenna?

SelectAnswer
ATo cancel capacitive reactance
BTo lower the losses
CTo lower the Q
DTo increase the SWR bandwidth

47. - E9E03

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?

SelectAnswer
AThe gamma match
BThe delta match
CThe omega match
DThe stub match

48. - E9F05

What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 14.1 MHz?

SelectAnswer
A5.3 meters
B4.3 meters
C3.5 meters
D10.6 meters

49. - E9G01

Which of the following can be calculated using a Smith chart?

SelectAnswer
AImpedance along transmission lines
BRadio propagation
CRadiation resistance
DAntenna radiation pattern

50. - E9H05

What is the main drawback of a small wire-loop antenna for direction finding?

SelectAnswer
AIt has no clearly defined null
BAll these choices are correct
CIt is practical for use only on VHF and higher bands
DIt has a bidirectional pattern

Figure E5-1

Figure E9-2