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. - G0A09

What type of instrument can be used to accurately measure an RF field strength?

Select	Answer
A	A calibrated field strength meter with a calibrated antenna
B	An oscilloscope with a high-stability crystal marker generator
C	An SWR meter with a peak-reading function
D	A receiver with digital signal processing (DSP) noise reduction

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. - G1A07

On which amateur frequencies in the 10-meter band may stations with a General class control operator transmit CW emissions?

Select	Answer
A	The entire band
B	28.000 MHz to 28.025 MHz only
C	28.000 MHz to 28.300 MHz only
D	28.025 MHz to 28.300 MHz only

4. - G1B05

Which of the following one-way transmissions are permitted?

Select	Answer
A	Transmissions to assist with learning the International Morse code
B	Regular transmissions offering equipment for sale, if intended for amateur radio use
C	All these choices are correct
D	Unidentified test transmissions of less than 10 seconds in duration

5. - G1C06

What is the limit for transmitter power on the 1.8 MHz band?

Select	Answer
A	1200 watts PEP output
B	200 watts PEP output
C	1000 watts PEP output
D	1500 watts PEP output

6. - G1D02

What license examinations may you administer as an accredited Volunteer Examiner holding a General class operator license?

Select	Answer
A	None, only Amateur Extra class licensees may be accredited
B	General and Technician
C	Amateur Extra, General, and Technician
D	Technician only

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

8. - G2A02

Which mode is most commonly used for voice communications on the 160-, 75-, and 40-meter bands?

Select	Answer
A	Upper sideband
B	Suppressed sideband
C	Double sideband
D	Lower sideband

9. - G2B09

Who may be the control operator of an amateur station transmitting in RACES to assist relief operations during a disaster?

Select	Answer
A	A person holding an FCC-issued amateur operator license or an appropriate government official
B	Only a RACES net control operator
C	Only a person holding an FCC-issued amateur operator license
D	Any control operator when normal communication systems are operational

10. - G2C02

What should you do if a CW station sends “QRS?”

Select	Answer
A	Change frequency
B	Repeat everything twice
C	Send slower
D	Increase your power

11. - G2D11

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

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

12. - G2E02

What is VARA?

Select	Answer
A	A digital protocol used with Winlink
B	A low signal-to-noise digital mode used for EME (moonbounce)
C	A DX spotting system using a network of software defined radios
D	A radio direction finding system used on VHF and UHF

13. - G3A10

What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

Select	Answer
A	Rotation of the Sun’s surface layers around its axis
B	Long term oscillations in the upper atmosphere
C	The position of the Moon in its orbit
D	Cyclic variation in Earth’s radiation belts

14. - G3B07

What does LUF stand for?

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

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	Propagation is via ground waves, which absorb most of the signal energy
C	Propagation is via ducts in the F region, which absorb most of the energy
D	Only a small part of the signal energy is scattered into the skip zone

16. - G4A02

What is the benefit of using the opposite or “reverse” sideband when receiving CW?

Select	Answer
A	It may be possible to reduce or eliminate interference from other signals
B	Accidental out-of-band operation can be prevented
C	More stations can be accommodated within a given signal passband
D	Interference from impulse noise will be eliminated

17. - G4B05

Why do voltmeters have high input impedance?

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

18. - G4C01

Which of the following might be useful in reducing RF interference to audio frequency circuits?

Select	Answer
A	Reverse-biased diode
B	Forward-biased diode
C	Bypass capacitor
D	Bypass inductor

19. - G4D06

How much change in signal strength is typically represented by one S unit?

Select	Answer
A	12 dB
B	18 dB
C	15 dB
D	6 dB

20. - G4E08

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

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

21. - G5A12

What occurs in an LC circuit at resonance?

Select	Answer
A	The circuit radiates all its energy in the form of radio waves
B	Inductive reactance and capacitive reactance cancel
C	Current and voltage are equal
D	Resistance is cancelled

22. - G5B01

What dB change represents a factor of two increase or decrease in power?

Select	Answer
A	Approximately 2 dB
B	Approximately 9 dB
C	Approximately 6 dB
D	Approximately 3 dB

23. - G5C14

Which of the following components should be added to an inductor to increase the inductance?

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

24. - G6A10

Which element of a vacuum tube regulates the flow of electrons between cathode and plate?

Select	Answer
A	Control grid
B	Screen grid
C	Trigger electrode
D	Suppressor grid

25. - G6B01

What determines the performance of a ferrite core at different frequencies?

Select	Answer
A	The composition, or “mix,” of materials used
B	The ratio of outer diameter to inner diameter
C	Its conductivity
D	Its thickness

26. - G7A13

Which symbol in Figure G7-1 represents a tapped inductor?

Select	Answer
A	Symbol 7
B	Symbol 6
C	Symbol 11
D	Symbol 1

27. - G7B08

How is the efficiency of an RF power amplifier determined?

Select	Answer
A	Multiply the RF input power by the reciprocal of the RF output power
B	Add the RF input power to the DC output power
C	Divide the RF output power by the DC input power
D	Divide the DC input power by the DC output power

28. - G7C14

The bandwidth of a band-pass filter is measured between what two frequencies?

Select	Answer
A	Pole and zero
B	Image and harmonic
C	Cutoff and rolloff
D	Upper and lower half-power

29. - G8A06

Which of the following is characteristic of QPSK31?

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

30. - G8B03

What is another term for the mixing of two RF signals?

Select	Answer
A	Heterodyning
B	Synthesizing
C	Phase inversion
D	Frequency inversion

31. - G8C11

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

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

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

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	As high as possible above the ground
C	On the surface or buried a few inches below the ground
D	Parallel to the antenna element

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 power radiated in the major lobe compared to that in the opposite direction
D	The ratio of forward gain to dipole gain

35. - G9D11

Which of the following is a disadvantage of multiband antennas?

Select	Answer
A	They must be fed with open wire line
B	They present low impedance on all design frequencies
C	They have poor harmonic rejection
D	They must be used with an antenna tuner

Figure G7-1