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US Amateur Radio - General (Element 3, 2019-2023) Practice Test

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1. - G0A04

What does "time averaging" mean in reference to RF radiation exposure?

SelectAnswer
AThe average time it takes RF radiation to have any long-term effect on the body
BThe average amount of power developed by the transmitter over a specific 24-hour period
CThe total RF exposure averaged over a certain time
DThe total time of the exposure

2. - G0B12

What is the purpose of a power supply interlock?

SelectAnswer
ATo shut down the unit if it becomes too hot
BTo prevent unauthorized changes to the circuit that would void the manufacturer's warranty
CTo ensure that dangerous voltages are removed if the cabinet is opened
DTo shut off the power supply if too much voltage is produced

3. - G1A01

On which HF/MF bands is a General class license holder granted all amateur frequency privileges?

SelectAnswer
A160 meters, 60 meters, 30 meters, 17 meters, 12 meters, and 10 meters
B60 meters, 20 meters, 17 meters, and 12 meters
C160 meters, 80 meters, 40 meters, and 10 meters
D160 meters, 30 meters, 17 meters, 15 meters, 12 meters, and 10 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?

SelectAnswer
AThe FCC
BThe ITU
CThe IEEE
DThe control operator

5. - G1C05

What is the limit for transmitter power on the 28 MHz band for a General Class control operator?

SelectAnswer
A1500 watts PEP output
B1000 watts PEP output
C2000 watts PEP output
D100 watts PEP output

6. - G1D01

Who may receive partial credit for the elements represented by an expired Amateur Radio license?

SelectAnswer
AOnly persons who once held an FCC issued Novice, Technician, or Technician Plus license
BAnyone who held an FCC-issued Amateur Radio license that has been expired for not less than 5 years and not more than 15 years
CAny person who can demonstrate that they once held an FCC-issued General, Advanced, or Amateur Extra class license that was not revoked by the FCC
DAny person who previously held an amateur license issued by another country, but only if that country has a current reciprocal licensing agreement with the FCC

7. - G1E10

Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24. 930 and 28.200 MHz?

SelectAnswer
AThese frequencies are set aside for emergency operations
BA system of propagation beacon stations operates on those frequencies
CA system of automatic digital stations operates on those frequencies 
DThese frequencies are set aside for bulletins from the FCC

8. - G2A09

Why do most amateur stations use lower sideband on the 160-meter, 75-meter, and 40-meter bands?

SelectAnswer
ALower sideband is more efficient than upper sideband at these frequencies
BIt is good amateur practice
CLower sideband is the only sideband legal on these frequency bands
DBecause it is fully compatible with an AM detector

9. - G2B07

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

SelectAnswer
ACheck to see if the channel is assigned to another station
BIdentify your station by transmitting your call sign at least 3 times
CAll these choices are correct
DFollow the voluntary band plan for the operating mode you intend to use

10. - G2C10

What does the Q signal "QRN" mean?

SelectAnswer
ASend more slowly
BI am troubled by static
CZero beat my signal
DStop sending

11. - G2D11

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

SelectAnswer
APoor propagation at any time of day
BHeavy distortion on signals due to photon absorption
CHigh levels of atmospheric noise or "static"
DWorld-wide propagation during the daylight hours

12. - G2E03

What symptoms may result from other signals interfering with a PACTOR or WINMOR transmission?

SelectAnswer
AAll these choices are correct
BFrequent retries or timeouts
CFailure to establish a connection between stations
DLong pauses in message transmission

13. - G3A11

How long does it take charged particles from coronal mass ejections to affect radio propagation on Earth?

SelectAnswer
A4 to 8 minutes
B28 days
C20 to 40 hours
D14 days

14. - G3B02

What factors affect the MUF?

SelectAnswer
ASolar radiation and ionospheric disturbances
BTime of day and season
CPath distance and location
DAll these choices are correct

15. - G3C08

Why are HF scatter signals in the skip zone usually weak?

SelectAnswer
AOnly a small part of the signal energy is scattered into the skip zone
BPropagation is through ducts in the F region, which absorb most of the energy
CSignals are scattered from the magnetosphere, which is not a good reflector
DPropagation is through ground waves, which absorb most of the signal energy

16. - G4A15

Which of the following can be a symptom of transmitted RF being picked up by an audio cable carrying AFSK data signals between a computer and a transceiver?

SelectAnswer
AAll these choices are correct
BThe VOX circuit does not un-key the transmitter
CThe transmitter signal is distorted
DFrequent connection timeouts

17. - G4B07

What signals are used to conduct a two-tone test?

SelectAnswer
ATwo swept frequency tones
BTwo audio signals of the same frequency shifted 90 degrees
CTwo audio frequency range square wave signals of equal amplitude
DTwo non-harmonically related audio signals

18. - G4C07

Why should soldered joints not be used with the wires that connect the base of a tower to a system of ground rods?

SelectAnswer
AA soldered joint will likely be destroyed by the heat of a lightning strike
BSolder has too high a dielectric constant to provide adequate lightning protection
CSolder flux will prevent a low conductivity connection
DThe resistance of solder is too high

19. - G4D09

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

SelectAnswer
A14.344 to 14.347 MHz
B14.347 to 14.647 MHz
C14.347 to 14.350 MHz
D14.3455 to 14.3485 MHz

20. - G4E03

Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?

SelectAnswer
ATo the alternator or generator using heavy-gauge wire
BTo the battery using heavy-gauge wire
CTo the alternator or generator using resistor wire
DTo the battery using resistor wire

21. - G5A01

What is impedance?

SelectAnswer
AThe electric charge stored by a capacitor
BThe opposition to the flow of current in an AC circuit
CThe inverse of resistance
DThe force of repulsion between two similar electric fields

22. - G5B09

What is the RMS voltage of a sine wave with a value of 17 volts peak?

SelectAnswer
A34 volts
B12 volts
C8.5 volts
D24 volts

23. - G5C18

What is the value in microfarads of a 4700 nanofarad (nF) capacitor?

SelectAnswer
A4.7
B0.47
C47,000
D47

24. - G6A02

What is an advantage of the low internal resistance of nickel-cadmium batteries?

SelectAnswer
AHigh voltage
BHigh discharge current
CLong life
DRapid recharge

25. - G6B08

How is an LED biased when emitting light?

SelectAnswer
ABeyond cutoff
BAt the Zener voltage
CForward biased
DReverse biased

26. - G7A08

Which of the following is an advantage of a switchmode power supply as compared to a linear power supply?

SelectAnswer
AFaster switching time makes higher output voltage possible
BAll these choices are correct
CFewer circuit components are required
DHigh-frequency operation allows the use of smaller components

27. - G7B07

Which of the following are basic components of a sine wave oscillator?

SelectAnswer
AA filter and an amplifier operating in a feedback loop
BA frequency multiplier and a mixer
CAn amplifier and a divider
DA circulator and a filter operating in a feed-forward loop

28. - G7C03

What circuit is used to process signals from the RF amplifier and local oscillator then send the result to the IF filter in a superheterodyne receiver?

SelectAnswer
ADetector
BIF amplifier
CMixer
DBalanced modulator

29. - G8A06

Which of the following is characteristic of QPSK31?

SelectAnswer
AIts bandwidth is approximately the same as BPSK31
BIt is sideband sensitive
CIts encoding provides error correction
DAll these choices are correct

30. - G8B03

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

SelectAnswer
ASynthesizing
BPhase inverting
CHeterodyning
DCancellation

31. - G8C09

What does the number 31 represent in "PSK31"?

SelectAnswer
AThe year in which PSK31 was invented
BThe number of characters that can be represented by PSK31
CThe approximate transmitted symbol rate
DThe version of the PSK protocol

32. - G9A07

What must be done to prevent standing waves on an antenna feed line?

SelectAnswer
AThe feed line must be cut to a length equal to an odd number of electrical quarter wavelengths
BThe feed line must be cut to a length equal to an even number of physical half wavelengths
CThe antenna feed point must be at DC ground potential
DThe antenna feed point impedance must be matched to the characteristic impedance of the feed line

33. - G9B06

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

SelectAnswer
AAs high as possible above the ground
BOn the surface of the Earth or buried a few inches below the ground
CParallel to the antenna element
DAt the center of the antenna

34. - G9C15

What is meant by the terms dBi and dBd when referring to antenna gain?

SelectAnswer
AdBi refers to an isometric antenna, dBd refers to a discone antenna
BdBi refers to an ionospheric reflecting antenna, dBd refers to a dissipative antenna
CdBi refers to an isotropic antenna, dBd refers to a dipole antenna
DdBi refers to an inverted-vee antenna, dBd refers to a downward reflecting antenna

35. - G9D10

In which direction or directions does an electrically small loop (less than 1/3 wavelength in circumference) have nulls in its radiation pattern?

SelectAnswer
ABroadside to the loop
BElectrically small loops are omnidirectional
CIn the plane of the loop
DBroadside and in the plane of the loop