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

2. - G0B05

Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?

Select	Answer
A	Overvoltage on the hot wires
B	Current flowing from one or more of the hot wires to the neutral wire
C	Current flowing from one or more of the hot wires directly to ground
D	All these choices are correct

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	All these choices are correct
C	21.275 MHz to 21.300 MHz
D	7.125 MHz to 7.175 MHz

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 IEEE
C	The ITU
D	The FCC

5. - G1C03

What is the maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band?

Select	Answer
A	1.8 kHz
B	2.8 kHz
C	5.6 kHz
D	3 kHz

6. - G1D01

Who may receive partial credit for the elements represented by an expired amateur radio license?

Select	Answer
A	Only persons who once held an FCC issued Novice, Technician, or Technician Plus license
B	Any 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
C	Any 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
D	Anyone who held an FCC-issued amateur radio license that expired not less than 5 and not more than 15 years ago

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

8. - G2A03

Which mode is most commonly used for SSB voice communications in the VHF and UHF bands?

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

9. - G2B10

Which of the following is good amateur practice for net management?

Select	Answer
A	All these choices are correct
B	Have a backup frequency in case of interference or poor conditions
C	Transmit the full net roster at the beginning of every session
D	Always use multiple sets of phonetics during check-in

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

11. - G2D10

What is QRP operation?

Select	Answer
A	Transmission using Quick Response Protocol
B	Low-power transmit operation
C	Remote piloted model control
D	Traffic relay procedure net operation

12. - G2E06

What is the most common frequency shift for RTTY emissions in the amateur HF bands?

Select	Answer
A	850 Hz
B	85 Hz
C	425 Hz
D	170 Hz

13. - G3A06

What is a geomagnetic storm?

Select	Answer
A	Ripples in the geomagnetic force
B	A temporary disturbance in Earth’s geomagnetic field
C	A sudden drop in the solar flux index
D	A thunderstorm that affects radio propagation

14. - G3B09

What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the F2 region?

Select	Answer
A	2,500 miles
B	1,200 miles
C	12,000 miles
D	180 miles

15. - G3C09

What type of propagation allows signals to be heard in the transmitting station’s skip zone?

Select	Answer
A	Short-path
B	Chordal hop
C	Faraday rotation
D	Scatter

16. - G4A06

What is the purpose of an antenna tuner?

Select	Answer
A	Reduce the power dissipation in the feedline to the antenna
B	Reduce the SWR in the feed line to the antenna
C	All these choices are correct
D	Increase power transfer from the transmitter to the feed line

17. - G4B10

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

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

18. - G4C01

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

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

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 100 times more powerful
D	It is 10 times less powerful

20. - G4E04

Why should DC power for a 100-watt HF transceiver not be supplied by a vehicle’s auxiliary power socket?

Select	Answer
A	Drawing more than 50 watts from this socket could cause the engine to overheat
B	The DC polarity of the socket is reversed from the polarity of modern HF transceivers
C	The socket is not wired with an RF-shielded power cable
D	The socket’s wiring may be inadequate for the current drawn by the transceiver

21. - G5A01

What happens when inductive and capacitive reactance are equal in a series LC circuit?

Select	Answer
A	Resonance causes impedance to be very high
B	Resonance causes impedance to be very low
C	Impedance is equal to the geometric mean of the inductance and capacitance
D	Impedance is equal to the arithmetic mean of the inductance and capacitance

22. - G5B03

How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?

Select	Answer
A	3200 watts
B	400 watts
C	0.5 watts
D	200 watts

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	Displacement current coupling
B	Mutual capacitance
C	Capacitive coupling
D	Mutual inductance

24. - G6A06

Why should wire-wound resistors not be used in RF circuits?

Select	Answer
A	The resistor could overheat
B	The resistor’s tolerance value would not be adequate
C	The resistor’s internal capacitance would detune the circuit
D	The resistor’s inductance could make circuit performance unpredictable

25. - G6B03

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

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

26. - G7A04

What is characteristic of a half-wave rectifier in a power supply?

Select	Answer
A	Only one diode is required
B	More current can be drawn from the half-wave rectifier
C	The output voltage is two times the peak input voltage
D	The ripple frequency is twice that of a full-wave rectifier

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	Divide the DC input power by the DC output power
C	Divide the RF output power by the DC input power
D	Add the RF input power to the DC output power

28. - G7C11

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

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

29. - G8A09

What type of modulation is used by FT8?

Select	Answer
A	Vestigial sideband
B	8-bit direct sequence spread spectrum
C	Amplitude compressed AM
D	8-tone frequency shift keying

30. - G8B03

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

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

31. - G8C07

Which of the following narrow-band digital modes can receive signals with very low signal-to-noise ratios?

Select	Answer
A	MSK144
B	AMTOR
C	MFSK32
D	FT8

32. - G9A01

Which of the following factors determine the characteristic impedance of a parallel conductor feed line?

Select	Answer
A	The radius of the conductors and the frequency of the signal
B	The frequency of the signal and the length of the line
C	The distance between the centers of the conductors and the radius of the conductors
D	The distance between the centers of the conductors and the length of the line

33. - G9B12

What is the approximate length for a 1/4 wave monopole antenna cut for 28.5 MHz?

Select	Answer
A	8 feet
B	16 feet
C	11 feet
D	21 feet

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 spacing of each element along the boom
C	The number of elements on 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	In the plane of the loop
B	Broadside to the loop
C	Electrically small loops are omnidirectional
D	Broadside and in the plane of the loop