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

2. - G0B02

According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?

Select	Answer
A	AWG number 8
B	AWG number 20
C	AWG number 12
D	AWG number 16

3. - G1A09

Which of the following frequencies is within the General class portion of the 15-meter band?

Select	Answer
A	24900 kHz
B	21300 kHz
C	18155 kHz
D	14250 kHz

4. - G1B08

When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission?

Select	Answer
A	Only when the foreign country has a formal third-party agreement filed with the FCC
B	When the contact is with amateurs in any country except those whose administrations have notified the ITU that they object to such communications
C	Only when the contact is with amateurs licensed by a country which is a member of the United Nations, or by a territory possessed by such a country
D	Only when the contact is with amateurs licensed by a country which is a member of the International Amateur Radio Union, or by a territory possessed by such a country

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	300 baud
C	56 kilobaud
D	1200 baud

6. - G1D06

Until an upgrade to General class is shown in the FCC database, when must a Technician licensee identify with “AG” after their call sign?

Select	Answer
A	Whenever they operate on any amateur frequency
B	A special identifier is not required if their General class license application has been filed with the FCC
C	Whenever they operate using General class frequency privileges
D	Whenever they operate using Technician frequency privileges

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

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

9. - G2B01

Which of the following is true concerning access to frequencies?

Select	Answer
A	Except during emergencies, no amateur station has priority access to any frequency
B	Contest operations should yield to non-contest use of frequencies
C	Nets have priority
D	QSOs in progress have priority

10. - G2C05

What is the best speed to use when answering a CQ in Morse code?

Select	Answer
A	At the standard calling speed of 10 wpm
B	The fastest speed at which you are comfortable copying, but no slower than the CQ
C	The fastest speed at which you are comfortable copying, but no faster than the CQ
D	At the standard calling speed of 5 wpm

11. - G2D05

Which of the following indicates that you are looking for an HF contact with any station?

Select	Answer
A	Say “QTC” followed by “this is” and your call sign -- if no answer, change frequency and repeat
B	Sign your call sign once, followed by the words “listening for a call” -- if no answer, change frequency and repeat
C	Repeat “CQ” a few times, followed by “this is,” then your call sign a few times, then pause to listen, repeat as necessary
D	Transmit an unmodulated carried for approximately 10 seconds, followed by “this is” and your call sign, and pause to listen -- repeat as necessary

12. - G2E05

What is the standard sideband for JT65, JT9, FT4, or FT8 digital signal when using AFSK?

Select	Answer
A	SSB
B	LSB
C	DSB
D	USB

13. - G3A11

How long does it take a coronal mass ejection to affect radio propagation on Earth?

Select	Answer
A	15 hours to several days
B	4 to 8 minutes
C	14 days
D	28 days

14. - G3B07

What does LUF stand for?

Select	Answer
A	Lowest Usable Frequency during the past 60 minutes
B	The Lowest Usable Frequency for communications between two specific points
C	The Lowest Usable Frequency during a 24-hour period
D	Lowest Usable Frequency for communications to any point outside a 100-mile radius

15. - G3C03

Why is skip propagation via the F2 region longer than that via the other ionospheric regions?

Select	Answer
A	Because it is the highest
B	Because of temperature inversions
C	Because it is the densest
D	Because of the Doppler effect

16. - G4A07

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

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

17. - G4B01

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

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

18. - G4C04

What sound is heard from an audio device experiencing RF interference from a CW transmitter?

Select	Answer
A	Severely distorted audio
B	On-and-off humming or clicking
C	A chirpy CW signal
D	A CW signal at a nearly pure audio frequency

19. - G4D02

How does a speech processor affect a single sideband phone signal?

Select	Answer
A	It reduces harmonic distortion
B	It reduces intermodulation distortion
C	It increases average power
D	It increases peak power

20. - G4E09

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

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

21. - G5A11

What letter is used to represent reactance?

Select	Answer
A	X
B	B
C	Y
D	Z

22. - G5B07

What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?

Select	Answer
A	The RMS value
B	The peak value
C	The reciprocal of the RMS value
D	The peak-to-peak value

23. - G5C10

What is the inductance of three 10-millihenry inductors connected in parallel?

Select	Answer
A	0.30 henries
B	3.3 millihenries
C	3.3 henries
D	30 millihenries

24. - G6A07

What are the operating points for a bipolar transistor used as a switch?

Select	Answer
A	Saturation and cutoff
B	Peak and valley current points
C	Enhancement and depletion modes
D	The active region (between cutoff and saturation)

25. - G6B03

Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?

Select	Answer
A	Low power consumption
B	High power handling capability
C	Better suited for RF amplification
D	Better suited for power supply regulation

26. - G7A03

Which type of rectifier circuit uses two diodes and a center-tapped transformer?

Select	Answer
A	Full-wave bridge
B	Full-wave
C	Half-wave
D	Synchronous

27. - G7B05

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

Select	Answer
A	3
B	16
C	6
D	8

28. - G7C13

What term specifies a filter’s maximum ability to reject signals outside its passband?

Select	Answer
A	Rolloff
B	Insertion loss
C	Notch depth
D	Ultimate rejection

29. - G8A06

Which of the following is characteristic of QPSK31?

Select	Answer
A	Its bandwidth is approximately the same as BPSK31
B	Its encoding provides error correction
C	It is sideband sensitive
D	All these choices are correct

30. - G8B10

What is the relationship between transmitted symbol rate and bandwidth?

Select	Answer
A	Symbol rate and bandwidth are not related
B	Bandwidth is half the symbol rate
C	Lower symbol rates require wider bandwidth
D	Higher symbol rates require wider bandwidth

31. - G8C13

What is indicated on a waterfall display by one or more vertical lines on either side of a data mode or RTTY signal?

Select	Answer
A	Overmodulation
B	Long path propagation
C	Insufficient modulation
D	Backscatter propagation

32. - G9A11

What is the effect of transmission line loss on SWR measured at the input to the line?

Select	Answer
A	Transmission line loss does not affect the SWR measurement
B	Higher loss increases SWR measured at the input to the line
C	Higher loss reduces SWR measured at the input to the line
D	Higher loss increases the accuracy of SWR measured at the input to the line

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

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 3 dB higher
B	Approximately 9 dB higher
C	Approximately 6 dB higher
D	Approximately 1.5 dB higher

35. - G9D12

What is the common name of a dipole with a single central support?

Select	Answer
A	Inverted L
B	Inverted V
C	Lazy H
D	Sloper