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

2. - G0B13

Where should lightning arrestors be located?

Select	Answer
A	In series with each ground lead
B	Where the feed lines enter the building
C	On the antenna, opposite the feed point
D	At the closest power pole ground electrode

3. - G1A05

On which of the following frequencies are General class licensees prohibited from operating as control operator?

Select	Answer
A	28.000 MHz to 28.025 MHz
B	7.125 MHz to 7.175 MHz
C	All these choices are correct
D	21.275 MHz to 21.300 MHz

4. - G1B04

Which of the following transmissions is permitted for all amateur stations?

Select	Answer
A	Unidentified transmissions of less than 10 seconds duration for test purposes only
B	Encrypted messages, if not intended to facilitate a criminal act
C	Occasional retransmission of weather and propagation forecast information from US government stations
D	Automatic retransmission of other amateur signals by any amateur station

5. - G1C10

What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 10-meter band?

Select	Answer
A	19.6 kilobaud
B	56 kilobaud
C	300 baud
D	1200 baud

6. - G1D10

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

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

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

8. - G2A12

What control is typically adjusted for proper ALC setting on a single sideband transceiver?

Select	Answer
A	Antenna inductance or capacitance
B	Transmit audio or microphone gain
C	RF clipping level
D	Attenuator level

9. - G2B07

Which of the following complies with commonly accepted amateur practice when choosing a frequency on which to initiate a call?

Select	Answer
A	Follow the voluntary band plan
B	Identify your station by transmitting your call sign at least 3 times
C	Listen on the frequency for at least two minutes to be sure it is clear
D	All these choices are correct

10. - G2C04

What does the Q signal “QRL?” mean?

Select	Answer
A	“Will you keep the frequency clear?”
B	“Are you operating full break-in?” or “Can you operate full break-in?”
C	“Are you listening only for a specific station?”
D	“Are you busy?” or “Is this frequency in use?”

11. - G2D11

Why are signal reports typically exchanged at the beginning of an HF contact?

Select	Answer
A	To follow standard radiogram structure
B	To allow each station to operate according to conditions
C	To be sure the contact will count for award programs
D	To allow each station to calibrate their frequency display

12. - G2E07

Which of the following is required when using FT8?

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

13. - G3A03

Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?

Select	Answer
A	20 to 40 hours
B	1 to 2 hours
C	28 days
D	8 minutes

14. - G3B12

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

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

15. - G3C02

What is meant by the term “critical frequency” at a given incidence angle?

Select	Answer
A	The lowest frequency which is refracted back to Earth
B	The highest frequency which is refracted back to Earth
C	The frequency at which the signal-to-noise ratio is 6 dB
D	The frequency at which the signal-to-noise ratio approaches unity

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 frequency may shift several kHz
D	Received signals may become distorted

17. - G4B10

Which of the following can be determined with a directional wattmeter?

Select	Answer
A	Standing wave ratio
B	Antenna front-to-back ratio
C	Radio wave propagation
D	RF interference

18. - G4C09

How can the effects of ground loops be minimized?

Select	Answer
A	Connect all ground conductors in series
B	Connect the AC neutral conductor to the ground wire
C	Bond equipment enclosures together
D	Avoid using lock washers and star washers when making ground connections

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 20 times less powerful
C	It is 10 times less powerful
D	It is 100 times more powerful

20. - G4E09

What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?

Select	Answer
A	0.5 VDC
B	0.02 VDC
C	1.38 VDC
D	0.2 VDC

21. - G5A03

Which of the following is opposition to the flow of alternating current in an inductor?

Select	Answer
A	Conductance
B	Reluctance
C	Reactance
D	Admittance

22. - G5B08

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

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

23. - G5C01

What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

Select	Answer
A	Mutual inductance
B	Capacitive coupling
C	Displacement current coupling
D	Mutual capacitance

24. - G6A03

What is the approximate forward threshold voltage of a germanium diode?

Select	Answer
A	1.0 volts
B	0.3 volts
C	0.1 volt
D	0.7 volts

25. - G6B12

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

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

26. - G7A10

Which symbol in figure G7-1 represents a Zener diode?

Select	Answer
A	Symbol 11
B	Symbol 5
C	Symbol 4
D	Symbol 1

27. - G7B05

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

Select	Answer
A	3
B	6
C	8
D	16

28. - G7C02

What output is produced by a balanced modulator?

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

29. - G8A11

What is the modulation envelope of an AM signal?

Select	Answer
A	The bandwidth of the modulated signal
B	The carrier frequency that contains the signal
C	Spurious signals that envelop nearby frequencies
D	The waveform created by connecting the peak values of the modulated signal

30. - G8B01

Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?

Select	Answer
A	RF input
B	Image frequency
C	Local oscillator
D	Beat frequency oscillator

31. - G8C01

On what band do amateurs share channels with the unlicensed Wi-Fi service?

Select	Answer
A	902 MHz
B	2.4 GHz
C	432 MHz
D	10.7 GHz

32. - G9A08

If the SWR on an antenna feed line is 5:1, and a matching network at the transmitter end of the feed line is adjusted to present a 1:1 SWR to the transmitter, what is the resulting SWR on the feed line?

Select	Answer
A	1:1
B	Between 1:1 and 5:1 depending on the characteristic impedance of the line
C	5:1
D	Between 1:1 and 5:1 depending on the reflected power at the transmitter

33. - G9B08

How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?

Select	Answer
A	It is unaffected by the location of the feed point
B	It steadily decreases
C	It peaks at about 1/8 wavelength from the end
D	It steadily increases

34. - G9C09

In free space, how does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?

Select	Answer
A	Approximately 6 dB higher
B	Approximately 9 dB higher
C	Approximately 1.5 dB higher
D	Approximately 3 dB higher

35. - G9D10

In which direction or directions does an electrically small loop (less than 1/10 wavelength in circumference) have nulls in its radiation pattern?

Select	Answer
A	Broadside and in the plane of the loop
B	Electrically small loops are omnidirectional
C	In the plane of the loop
D	Broadside to the loop

Figure G7-1