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	Low duty cycle transmitters are exempt from RF exposure evaluation requirements
D	High duty cycle transmitters are exempt from RF exposure requirements

2. - G0B12

What is the purpose of a power supply interlock?

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

3. - G1A04

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

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

4. - G1B11

Who or what determines “good engineering and good amateur practice,” as applied to the operation of an amateur station in all respects not covered by the Part 97 rules?

Select	Answer
A	The control operator
B	The ITU
C	The IEEE
D	The FCC

5. - G1C11

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

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

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

7. - G1E02

When may a 10-meter repeater retransmit the 2-meter signal from a station that has a Technician class control operator?

Select	Answer
A	Under no circumstances
B	Only if the 10-meter repeater control operator holds at least a General class license
C	Only during an FCC-declared general state of communications emergency
D	Only if the station on 10-meters is operating under a Special Temporary Authorization allowing such retransmission

8. - G2A11

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

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

9. - G2B06

How can you avoid harmful interference on an apparently clear frequency before calling CQ on CW or phone?

Select	Answer
A	Listen for 2 minutes before calling CQ
B	Send “QSY” on CW or if using phone, announce “the frequency is in use,” then give your call sign and listen for a response
C	Send the letter “V” in Morse code several times and listen for a response, or say “test” several times and listen for a response
D	Send “QRL?” on CW, followed by your call sign; or, if using phone, ask if the frequency is in use, followed by your call sign

10. - G2C08

What prosign is sent to indicate the end of a formal message when using CW?

Select	Answer
A	BK
B	SK
C	KN
D	AR

11. - G2D05

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

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

12. - G2E08

In what segment of the 20-meter band are most digital mode operations commonly found?

Select	Answer
A	In the middle of the CW segment, near 14.100 MHz
B	At the bottom of the slow-scan TV segment, near 14.230 MHz
C	Between 14.070 MHz and 14.100 MHz
D	At the top of the SSB phone segment, near 14.325 MHz

13. - G3A14

How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?

Select	Answer
A	HF communication is improved
B	VHF/UHF ducting is disturbed
C	HF communication is disturbed
D	VHF/UHF ducting is improved

14. - G3B01

What is a characteristic of skywave signals arriving at your location by both short-path and long-path propagation?

Select	Answer
A	The signal might be cancelled causing severe attenuation
B	Periodic fading approximately every 10 seconds
C	Signal strength increased by 3 dB
D	A slightly delayed echo might be heard

15. - G3C06

What is a characteristic of HF scatter?

Select	Answer
A	Phone signals have high intelligibility
B	Scatter propagation occurs only at night
C	There are very large, sudden swings in signal strength
D	Signals have a fluttering sound

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. - G4B13

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

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

18. - G4C06

What is a possible effect of a resonant ground connection?

Select	Answer
A	Corrosion of the ground rod
B	High RF voltages on the enclosures of station equipment
C	Overheating of ground straps
D	A ground loop

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

20. - G4E01

What is the purpose of a capacitance hat on a mobile antenna?

Select	Answer
A	To increase the power handling capacity of a whip antenna
B	To lower the radiation angle
C	To electrically lengthen a physically short antenna
D	To reduce radiation resistance

21. - G5A07

What is the term for the inverse of impedance?

Select	Answer
A	Admittance
B	Reluctance
C	Susceptance
D	Conductance

22. - G5B12

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

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

23. - G5C04

What is the approximate total resistance of a 100- and a 200-ohm resistor in parallel?

Select	Answer
A	75 ohms
B	150 ohms
C	300 ohms
D	67 ohms

24. - G6A08

Which of the following is characteristic of low voltage ceramic capacitors?

Select	Answer
A	Comparatively low cost
B	High capacitance for given volume
C	High stability
D	Tight tolerance

25. - G6B10

How does a ferrite bead or core reduce common-mode RF current on the shield of a coaxial cable?

Select	Answer
A	Ferrites expel magnetic fields
B	It converts common-mode current to differential mode current
C	By creating an impedance in the current’s path
D	By creating an out-of-phase current to cancel the common-mode current

26. - G7A03

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

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

27. - G7B05

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

Select	Answer
A	8
B	16
C	3
D	6

28. - G7C11

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

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

29. - G8A13

What is a link budget?

Select	Answer
A	The sum of antenna gains minus system losses
B	The sum of transmit power and antenna gains minus system losses as seen at the receiver
C	The difference between transmit power and receiver sensitivity
D	The financial costs associated with operating a radio link

30. - G8B11

What combination of a mixer’s Local Oscillator (LO) and RF input frequencies is found in the output?

Select	Answer
A	The ratio
B	The average
C	The sum and difference
D	The arithmetic product

31. - G8C11

How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?

Select	Answer
A	Mark and space
B	High and low
C	On and off
D	Dot and dash

32. - G9A09

What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?

Select	Answer
A	2:1
B	1:2
C	1:4
D	4:1

33. - G9B06

Where should the radial wires of a ground-mounted vertical antenna system be placed?

Select	Answer
A	At the center of the antenna
B	On the surface or buried a few inches below the ground
C	Parallel to the antenna element
D	As high as possible above the ground

34. - G9C10

Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?

Select	Answer
A	All these choices are correct
B	The number of elements on the boom
C	The spacing of each element along the boom
D	The physical length of the boom

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