US Amateur Radio - General (Element 3, 2023-2027) Practice Test

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US Amateur Radio - General (Element 3, 2023-2027) Practice Test

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1. - G0A09

What type of instrument can be used to accurately measure an RF field strength?

Select	Answer
A	A receiver with digital signal processing (DSP) noise reduction
B	A calibrated field strength meter with a calibrated antenna
C	An SWR meter with a peak-reading function
D	An oscilloscope with a high-stability crystal marker generator

2. - G0B03

Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?

Select	Answer
A	20 amperes
B	30 amperes
C	15 amperes
D	25 amperes

3. - G1A03

On which of the following bands is image transmission prohibited?

Select	Answer
A	12 meters
B	160 meters
C	20 meters
D	30 meters

4. - G1B06

Under what conditions are state and local governments permitted to regulate amateur radio antenna structures?

Select	Answer
A	At any time and to any extent necessary to accomplish a legitimate purpose of the state or local entity, provided that proper filings are made with the FCC
B	Only when such structures exceed 50 feet in height and are clearly visible 1,000 feet from the structure
C	Under no circumstances, FCC rules take priority
D	Amateur Service communications must be reasonably accommodated, and regulations must constitute the minimum practical to accommodate a legitimate purpose of the state or local entity

5. - G1C11

What measurement is specified by FCC rules that regulate maximum power?

Select	Answer
A	PEP output from the transmitter
B	PEP input to the antenna
C	RMS output from the transmitter
D	RMS input to the antenna

6. - G1D10

What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?

Select	Answer
A	18 years
B	21 years
C	There is no age limit
D	16 years

7. - G1E06

The frequency allocations of which ITU region apply to radio amateurs operating in North and South America?

Select	Answer
A	Region 4
B	Region 3
C	Region 1
D	Region 2

8. - G2A07

Which of the following statements is true of single sideband (SSB)?

Select	Answer
A	Only one sideband and the carrier are transmitted; the other sideband is suppressed
B	SSB is the only voice mode authorized on the 160-, 75-, and 40-meter amateur bands
C	SSB is the only voice mode authorized on the 20-, 15-, and 10-meter amateur bands
D	Only one sideband is transmitted; the other sideband and carrier are suppressed

9. - G2B04

When selecting a CW transmitting frequency, what minimum separation from other stations should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	1 kHz to 3 kHz
B	5 Hz to 50 Hz
C	3 kHz to 6 kHz
D	150 Hz to 500 Hz

10. - G2C03

What does it mean when a CW operator sends “KN” at the end of a transmission?

Select	Answer
A	Closing station now
B	No US stations should call
C	Operating full break-in
D	Listening only for a specific station or stations

11. - G2D07

Which of the following are examples of the NATO Phonetic Alphabet?

Select	Answer
A	America, Boston, Canada, Denmark
B	Alpha, Bravo, Charlie, Delta
C	Adam, Boy, Charles, David
D	Able, Baker, Charlie, Dog

12. - G2E03

What symptoms may result from other signals interfering with a PACTOR or VARA transmission?

Select	Answer
A	Long pauses in message transmission
B	All these choices are correct
C	Failure to establish a connection between stations
D	Frequent retries or timeouts

13. - G3A10

What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

Select	Answer
A	The position of the Moon in its orbit
B	Rotation of the Sun’s surface layers around its axis
C	Long term oscillations in the upper atmosphere
D	Cyclic variation in Earth’s radiation belts

14. - G3B02

What factors affect the MUF?

Select	Answer
A	Solar radiation and ionospheric disturbances
B	All these choices are correct
C	Time of day and season
D	Path distance and location

15. - G3C04

What does the term “critical angle” mean, as applied to radio wave propagation?

Select	Answer
A	The short path azimuth of a distant station
B	The highest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions
C	The long path azimuth of a distant station
D	The lowest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions

16. - G4A07

What happens as a receiver’s noise reduction control level is increased?

Select	Answer
A	CW signals may become severely attenuated
B	Received frequency may become unstable
C	Received signals may become distorted
D	Received frequency may shift several kHz

17. - G4B01

What item of test equipment contains horizontal and vertical channel amplifiers?

Select	Answer
A	An ohmmeter
B	An ammeter
C	An oscilloscope
D	A signal generator

18. - G4C03

What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter?

Select	Answer
A	A steady hum whenever the transmitter is on the air
B	Distorted speech
C	On-and-off humming or clicking
D	Clearly audible speech

19. - G4D05

How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?

Select	Answer
A	It is 20 times more powerful
B	It is 100 times more powerful
C	It is 10 times less powerful
D	It is 20 times less powerful

20. - G4E04

Why should DC power for a 100-watt HF transceiver not be supplied by a vehicle’s auxiliary power socket?

Select	Answer
A	The DC polarity of the socket is reversed from the polarity of modern HF transceivers
B	Drawing more than 50 watts from this socket could cause the engine to overheat
C	The socket’s wiring may be inadequate for the current drawn by the transceiver
D	The socket is not wired with an RF-shielded power cable

21. - G5A07

What is the term for the inverse of impedance?

Select	Answer
A	Susceptance
B	Conductance
C	Admittance
D	Reluctance

22. - G5B13

What is the output PEP of an unmodulated carrier if the average power is 1060 watts?

Select	Answer
A	1500 watts
B	530 watts
C	2120 watts
D	1060 watts

23. - G5C06

What is the voltage output of a transformer with a 500-turn primary and a 1500-turn secondary when 120 VAC is applied to the primary?

Select	Answer
A	360 volts
B	25.5 volts
C	120 volts
D	40 volts

24. - G6A04

Which of the following is characteristic of an electrolytic capacitor?

Select	Answer
A	Much less leakage than any other type
B	Tight tolerance
C	High capacitance for a given volume
D	Inexpensive RF capacitor

25. - G6B12

Which of these connector types is commonly used for low frequency or dc signal connections to a transceiver?

Select	Answer
A	BNC
B	Type N
C	PL-259
D	RCA Phono

26. - G7A05

What portion of the AC cycle is converted to DC by a half-wave rectifier?

Select	Answer
A	90 degrees
B	270 degrees
C	360 degrees
D	180 degrees

27. - G7B06

What is a shift register?

Select	Answer
A	A digital mixer
B	A clocked array of circuits that passes data in steps along the array
C	An array of operational amplifiers used for tri-state arithmetic operations
D	An analog mixer

28. - G7C02

What output is produced by a balanced modulator?

Select	Answer
A	Frequency modulated RF
B	Audio with equalized frequency response
C	Double-sideband modulated RF
D	Audio extracted from the modulation signal

29. - G8A07

Which of the following phone emissions uses the narrowest bandwidth?

Select	Answer
A	Single sideband
B	Vestigial sideband
C	Phase modulation
D	Frequency modulation

30. - G8B02

What is the term for interference from a signal at twice the IF frequency from the desired signal?

Select	Answer
A	Intermediate interference
B	Image response
C	Quadrature response
D	Mixer interference

31. - G8C04

Which of the following describes Baudot code?

Select	Answer
A	A code using SELCAL and LISTEN
B	A code using error detection and correction
C	A 5-bit code with additional start and stop bits
D	A 7-bit code with start, stop, and parity bits

32. - G9A05

How does the attenuation of coaxial cable change with increasing frequency?

Select	Answer
A	Attenuation decreases
B	Attenuation follows Marconi’s Law of Attenuation
C	Attenuation increases
D	Attenuation is independent of frequency

33. - G9B05

How does antenna height affect the azimuthal radiation pattern of a horizontal dipole HF antenna at elevation angles higher than about 45 degrees?

Select	Answer
A	If the antenna is too high, the pattern becomes unpredictable
B	If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional
C	Antenna height has no effect on the pattern
D	If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated

34. - G9C11

What is a beta or hairpin match?

Select	Answer
A	A series capacitor selected to cancel the inductive reactance of a folded dipole antenna
B	A section of 300-ohm twin-lead transmission line used to match a folded dipole antenna
C	A shorted transmission line stub placed at the feed point of a Yagi antenna to provide impedance matching
D	A 1/4 wavelength section of 75-ohm coax in series with the feed point of a Yagi to provide impedance matching

35. - G9D07

Which of the following describes a log-periodic antenna?

Select	Answer
A	Gain varies logarithmically as a function of frequency
B	Element length and spacing vary logarithmically along the boom
C	SWR varies periodically as a function of boom length
D	Impedance varies periodically as a function of frequency