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. - G0A07

What is the effect of modulation duty cycle on RF exposure?

Select	Answer
A	A lower duty cycle permits greater power levels to be transmitted
B	Low duty cycle transmitters are exempt from RF exposure evaluation requirements
C	High duty cycle transmitters are exempt from RF exposure requirements
D	A higher duty cycle permits greater power levels to be transmitted

2. - G0B10

Which of the following is a danger from lead-tin solder?

Select	Answer
A	Tin in the solder can “cold flow,” causing shorts in the circuit
B	High voltages can cause lead-tin solder to disintegrate suddenly
C	RF energy can convert the lead into a poisonous gas
D	Lead can contaminate food if hands are not washed carefully after handling the solder

3. - G1A04

Which of the following amateur bands is restricted to communication only on specific channels, rather than frequency ranges?

Select	Answer
A	11 meters
B	12 meters
C	30 meters
D	60 meters

4. - G1B09

On what HF frequencies are automatically controlled beacons permitted?

Select	Answer
A	On any frequency if transmissions are in Morse code
B	On any frequency if power is less than 1 watt
C	21.08 MHz to 21.09 MHz
D	28.20 MHz to 28.30 MHz

5. - G1C04

Which of the following is required by the FCC rules when operating in the 60-meter band?

Select	Answer
A	You must keep a record of the date, time, frequency, power level, and stations worked
B	You must keep a record of the manufacturer of your equipment and the antenna used
C	If you are using an antenna other than a dipole, you must keep a record of the gain of your antenna
D	You must keep a record of all third-party traffic

6. - G1D10

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

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

7. - G1E10

Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz?

Select	Answer
A	A system of automatic digital stations operates on those frequencies
B	These frequencies are set aside for emergency operations
C	These frequencies are set aside for bulletins from the FCC
D	A system of propagation beacon stations operates on those frequencies

8. - G2A06

Which of the following is an advantage of using single sideband, as compared to other analog voice modes on the HF amateur bands?

Select	Answer
A	Less subject to interference from atmospheric static crashes
B	Very high-fidelity voice modulation
C	Less bandwidth used and greater power efficiency
D	Ease of tuning on receive and immunity to impulse noise

9. - G2B10

Which of the following is good amateur practice for net management?

Select	Answer
A	Have a backup frequency in case of interference or poor conditions
B	Always use multiple sets of phonetics during check-in
C	All these choices are correct
D	Transmit the full net roster at the beginning of every session

10. - G2C03

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

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

11. - G2D08

Why do many amateurs keep a station log?

Select	Answer
A	The log provides evidence of operation needed to renew a license without retest
B	To help with a reply if the FCC requests information about your station
C	The FCC requires a log of all international contacts
D	The FCC requires a log of all international third-party traffic

12. - G2E07

Which of the following is required when using FT8?

Select	Answer
A	A vertically polarized antenna
B	Receiver attenuator set to -12 dB
C	A special hardware modem
D	Computer time accurate to within approximately 1 second

13. - G3A02

What effect does a sudden ionospheric disturbance have on the daytime ionospheric propagation?

Select	Answer
A	It disrupts communications via satellite more than direct communications
B	It enhances propagation on all HF frequencies
C	It disrupts signals on lower frequencies more than those on higher frequencies
D	None, because only areas on the night side of the Earth are affected

14. - G3B03

Which frequency will have the least attenuation for long-distance skip propagation?

Select	Answer
A	Just above the critical frequency
B	Just below the MUF
C	Just below the critical frequency
D	Just above the LUF

15. - G3C08

Why are HF scatter signals in the skip zone usually weak?

Select	Answer
A	Signals are scattered from the magnetosphere, which is not a good reflector
B	Only a small part of the signal energy is scattered into the skip zone
C	Propagation is via ducts in the F region, which absorb most of the energy
D	Propagation is via ground waves, which absorb most of the signal energy

16. - G4A06

What is the purpose of an antenna tuner?

Select	Answer
A	All these choices are correct
B	Increase power transfer from the transmitter to the feed line
C	Reduce the power dissipation in the feedline to the antenna
D	Reduce the SWR in the feed line to the antenna

17. - G4B05

Why do voltmeters have high input impedance?

Select	Answer
A	It allows for higher voltages to be safely measured
B	It improves the frequency response
C	It decreases the loading on circuits being measured
D	It improves the resolution of the readings

18. - G4C08

Which of the following would reduce RF interference caused by common-mode current on an audio cable?

Select	Answer
A	Ground the center conductor of the audio cable causing the interference
B	Add an additional insulating jacket to the cable
C	Connect the center conductor to the shield of all cables to short circuit the RFI signal
D	Place a ferrite choke on the cable

19. - G4D08

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

Select	Answer
A	7.178 MHz to 7.184 MHz
B	7.1765 MHz to 7.1795 MHz
C	7.175 MHz to 7.178 MHz
D	7.178 MHz to 7.181 MHz

20. - G4E05

Which of the following most limits an HF mobile installation?

Select	Answer
A	Efficiency of the electrically short antenna
B	“Picket fencing”
C	The wire gauge of the DC power line to the transceiver
D	FCC rules limiting mobile output power on the 75-meter band

21. - G5A05

How does an inductor react to AC?

Select	Answer
A	As the frequency of the applied AC increases, the reactance increases
B	As the amplitude of the applied AC increases, the reactance increases
C	As the amplitude of the applied AC increases, the reactance decreases
D	As the frequency of the applied AC increases, the reactance decreases

22. - G5B12

What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?

Select	Answer
A	245 volts
B	173 volts
C	346 volts
D	692 volts

23. - G5C13

Which of the following components should be added to a capacitor to increase the capacitance?

Select	Answer
A	An inductor in parallel
B	An inductor in series
C	A capacitor in parallel
D	A capacitor in series

24. - G6A09

Which of the following describes MOSFET construction?

Select	Answer
A	The gate is formed by a back-biased junction
B	The gate is separated from the channel by a thin insulating layer
C	The source is separated from the drain by a thin insulating layer
D	The source is formed by depositing metal on silicon

25. - G6B08

How is an LED biased when emitting light?

Select	Answer
A	Reverse biased
B	At the Zener voltage
C	Forward biased
D	In the tunnel-effect region

26. - G7A04

What is characteristic of a half-wave rectifier in a power supply?

Select	Answer
A	Only one diode is required
B	The output voltage is two times the peak input voltage
C	The ripple frequency is twice that of a full-wave rectifier
D	More current can be drawn from the half-wave rectifier

27. - G7B05

How many states does a 3-bit binary counter have?

Select	Answer
A	8
B	6
C	3
D	16

28. - G7C01

What circuit is used to select one of the sidebands from a balanced modulator?

Select	Answer
A	IF amplifier
B	Filter
C	RF amplifier
D	Carrier oscillator

29. - G8A10

What is meant by the term “flat-topping,” when referring to an amplitude-modulated phone signal?

Select	Answer
A	The transmitter’s carrier is properly suppressed
B	Signal distortion caused by insufficient collector current
C	Signal distortion caused by excessive drive or speech levels
D	The transmitter’s automatic level control (ALC) is properly adjusted

30. - G8B02

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

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

31. - G8C12

Which type of code is used for sending characters in a PSK31 signal?

Select	Answer
A	Binary
B	Varicode
C	Volumetric
D	Viterbi

32. - G9A05

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

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

33. - G9B03

Which of the following best describes the radiation pattern of a quarter-wave ground-plane vertical antenna?

Select	Answer
A	Isotropic
B	Bi-directional in azimuth
C	Hemispherical
D	Omnidirectional in azimuth

34. - G9C03

How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?

Select	Answer
A	Relative length depends on the frequency of operation
B	They are all the same length
C	The reflector is longer, and the director is shorter
D	The reflector is shorter, and the director is longer

35. - G9D02

What is the feed point impedance of an end-fed half-wave antenna?

Select	Answer
A	Very low
B	Very high
C	Approximately 300 ohms
D	Approximately 50 ohms