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. - G0A04

What does “time averaging” mean when evaluating RF radiation exposure?

Select	Answer
A	The average time it takes RF radiation to have any long-term effect on the body
B	The total RF exposure averaged over a certain period
C	The total time of the exposure
D	The average amount of power developed by the transmitter over a specific 24-hour period

2. - G0B12

What is the purpose of a power supply interlock?

Select	Answer
A	To ensure that dangerous voltages are removed if the cabinet is opened
B	To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty
C	To shut off the power supply if too much voltage is produced
D	To shut down the unit if it becomes too hot

3. - G1A03

On which of the following bands is image transmission prohibited?

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

4. - G1B03

Which of the following is a purpose of a beacon station as identified in the FCC rules?

Select	Answer
A	All these choices are correct
B	Automatic identification of repeaters
C	Observation of propagation and reception
D	Transmission of bulletins of general interest to amateur radio licensees

5. - G1C03

What is the maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band?

Select	Answer
A	1.8 kHz
B	2.8 kHz
C	3 kHz
D	5.6 kHz

6. - G1D07

Volunteer Examiners are accredited by what organization?

Select	Answer
A	A Volunteer Examiner Coordinator
B	The Federal Communications Commission
C	The Universal Licensing System
D	The Wireless Telecommunications Bureau

7. - G1E09

Under what circumstances are messages that are sent via digital modes exempt from Part 97 third-party rules that apply to other modes of communication?

Select	Answer
A	Under no circumstances
B	When messages are not encrypted
C	When under automatic control
D	When messages are encrypted

8. - G2A11

Generally, who should respond to a station in the contiguous 48 states calling “CQ DX”?

Select	Answer
A	Any caller is welcome to respond
B	Only contest stations
C	Only stations in Germany
D	Any stations outside the lower 48 states

9. - G2B05

When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	2 kHz to 3 kHz
B	5 Hz to 50 Hz
C	150 Hz to 500 Hz
D	Approximately 6 kHz

10. - G2C06

What does the term “zero beat” mean in CW operation?

Select	Answer
A	Matching the transmit frequency to the frequency of a received signal
B	Matching the speed of the transmitting station
C	Sending without error
D	Operating split to avoid interference on frequency

11. - G2D06

How is a directional antenna pointed when making a “long-path” contact with another station?

Select	Answer
A	Along the gray line
B	Toward the rising sun
C	180 degrees from the station’s short-path heading
D	Toward the north

12. - G2E09

How do you join a contact between two stations using the PACTOR protocol?

Select	Answer
A	Transmit a steady carrier until the PACTOR protocol times out and disconnects
B	Send a NAK code
C	Send broadcast packets containing your call sign while in MONITOR mode
D	Joining an existing contact is not possible, PACTOR connections are limited to two stations

13. - G3A06

What is a geomagnetic storm?

Select	Answer
A	A temporary disturbance in Earth’s geomagnetic field
B	A thunderstorm that affects radio propagation
C	A sudden drop in the solar flux index
D	Ripples in the geomagnetic force

14. - G3B12

Which of the following is typical of the lower HF frequencies during the summer?

Select	Answer
A	Heavy distortion on signals due to photon absorption
B	Poor propagation at any time of day
C	World-wide propagation during daylight hours
D	High levels of atmospheric noise or static

15. - G3C10

What is near vertical incidence skywave (NVIS) propagation?

Select	Answer
A	Short distance MF or HF propagation at high elevation angles
B	Long path HF propagation at sunrise and sunset
C	Double hop propagation near the LUF
D	Propagation near the MUF

16. - G4A06

What is the purpose of an antenna tuner?

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

17. - G4B13

Which of the following can be measured with an antenna analyzer?

Select	Answer
A	Power output from a transmitter
B	Front-to-back ratio of an antenna
C	Gain of a directional antenna
D	Impedance of coaxial cable

18. - G4C08

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

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

19. - G4D09

What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?

Select	Answer
A	14.344 MHz to 14.347 MHz
B	14.3455 MHz to 14.3485 MHz
C	14.347 MHz to 14.647 MHz
D	14.347 MHz to 14.350 MHz

20. - G4E08

In what configuration are the individual cells in a solar panel connected together?

Select	Answer
A	Shunt
B	Full-wave bridge
C	Series-parallel
D	Bypass

21. - G5A07

What is the term for the inverse of impedance?

Select	Answer
A	Reluctance
B	Susceptance
C	Admittance
D	Conductance

22. - G5B08

What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?

Select	Answer
A	169.7 volts
B	240.0 volts
C	84.8 volts
D	339.4 volts

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	40 volts
B	25.5 volts
C	360 volts
D	120 volts

24. - G6A11

What happens when an inductor is operated above its self-resonant frequency?

Select	Answer
A	It becomes capacitive
B	Its reactance increases
C	Catastrophic failure is likely
D	Harmonics are generated

25. - G6B08

How is an LED biased when emitting light?

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

26. - G7A06

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

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

27. - G7B04

In a Class A amplifier, what percentage of the time does the amplifying device conduct?

Select	Answer
A	More than 50% but less than 100%
B	Less than 50%
C	100%
D	50%

28. - G7C11

Which of these functions is performed by software in a software-defined radio (SDR)?

Select	Answer
A	Detection
B	Filtering
C	Modulation
D	All these choices are correct

29. - G8A14

What is link margin?

Select	Answer
A	Receiver sensitivity plus 3 dB
B	The difference between received power level and minimum required signal level at the input to the receiver
C	The opposite of fade margin
D	Transmit power minus receiver sensitivity

30. - G8B06

What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?

Select	Answer
A	16 kHz
B	5 kHz
C	3 kHz
D	8 kHz

31. - G8C06

What action results from a failure to exchange information due to excessive transmission attempts when using an ARQ mode?

Select	Answer
A	The checksum overflows
B	The connection is dropped
C	Packets will be routed incorrectly
D	Encoding reverts to the default character set

32. - G9A10

What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?

Select	Answer
A	1:2
B	1:5
C	5:1
D	2:1

33. - G9B01

What is a characteristic of a random-wire HF antenna connected directly to the transmitter?

Select	Answer
A	It produces only vertically polarized radiation
B	Station equipment may carry significant RF current
C	It must be longer than 1 wavelength
D	It is more effective on the lower HF bands than on the higher bands

34. - G9C07

What does “front-to-back ratio” mean in reference to a Yagi antenna?

Select	Answer
A	The number of directors versus the number of reflectors
B	The relative position of the driven element with respect to the reflectors and directors
C	The ratio of forward gain to dipole gain
D	The power radiated in the major lobe compared to that in the opposite direction

35. - G9D09

What is the primary use of a Beverage antenna?

Select	Answer
A	Directional receiving for MF and low HF bands
B	Directional transmitting for low HF bands
C	Portable direction finding at lower HF frequencies
D	Portable direction finding at higher HF frequencies