US Amateur Radio - General (Element 3, 2023-2027) Practice Test

Anonymous User

US Amateur Radio - General (Element 3, 2023-2027) Practice Test

Logging in (or registering) will help the system to select questions that you need to focus on.

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. - G0B12

What is the purpose of a power supply interlock?

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

3. - G1A06

Which of the following applies when the FCC rules designate the amateur service as a secondary user on a band?

Select	Answer
A	Amateur stations may only operate during specific hours of the day, while primary users are permitted 24-hour use of the band
B	Amateur stations may use the band only during emergencies
C	Amateur stations must not cause harmful interference to primary users and must accept interference from primary users
D	Amateur stations must record the call sign of the primary service station before operating on a frequency assigned to that station

4. - G1B06

Under what conditions are state and local governments permitted to regulate amateur radio antenna structures?

Select	Answer
A	At any time and to any extent necessary to accomplish a legitimate purpose of the state or local entity, provided that proper filings are made with the FCC
B	Amateur Service communications must be reasonably accommodated, and regulations must constitute the minimum practical to accommodate a legitimate purpose of the state or local entity
C	Under no circumstances, FCC rules take priority
D	Only when such structures exceed 50 feet in height and are clearly visible 1,000 feet from the structure

5. - G1C06

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

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

6. - G1D05

When operating a US station by remote control from outside the country, what license is required of the control operator?

Select	Answer
A	Only an appropriate US operator/primary license and a special remote station permit from the FCC
B	A license from the foreign country and a special remote station permit from the FCC
C	Only a license from the foreign country, as long as the call sign includes identification of portable operation in the US
D	A US operator/primary station license

7. - G1E11

On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?

Select	Answer
A	Anywhere in the 6-meter or shorter wavelength bands, and in limited segments of some of the HF bands
B	Anywhere in the non-phone segments of the 10-meter or shorter wavelength bands
C	Only in the non-phone Extra Class segments of the bands
D	On any band segment where digital operation is permitted

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

9. - G2B11

How often may RACES training drills and tests be routinely conducted without special authorization?

Select	Answer
A	No more than 2 hours per month
B	No more than 1 hour per week
C	No more than 2 hours per week
D	No more than 1 hour per month

10. - G2C10

What does the Q signal “QRN” mean?

Select	Answer
A	Stop sending
B	I am troubled by static
C	Zero beat my signal
D	Send more slowly

11. - G2D06

How is a directional antenna pointed when making a “long-path” contact with another station?

Select	Answer
A	180 degrees from the station’s short-path heading
B	Toward the rising sun
C	Toward the north
D	Along the gray line

12. - G2E12

Which of the following describes Winlink?

Select	Answer
A	An amateur radio wireless network to send and receive email on the internet
B	All of the above
C	A form of Packet Radio
D	A wireless network capable of both VHF and HF band operation

13. - G3A14

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

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

14. - G3B06

What usually happens to radio waves with frequencies below the LUF?

Select	Answer
A	They are refracted back to Earth
B	They pass through the ionosphere
C	They are refracted and trapped in the ionosphere to circle Earth
D	They are attenuated before reaching the destination

15. - G3C02

What is meant by the term “critical frequency” at a given incidence angle?

Select	Answer
A	The frequency at which the signal-to-noise ratio approaches unity
B	The frequency at which the signal-to-noise ratio is 6 dB
C	The lowest frequency which is refracted back to Earth
D	The highest frequency which is refracted back to Earth

16. - G4A06

What is the purpose of an antenna tuner?

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

17. - G4B02

Which of the following is an advantage of an oscilloscope versus a digital voltmeter?

Select	Answer
A	An oscilloscope uses less power
B	Greater precision
C	Complex waveforms can be measured
D	Complex impedances can be easily measured

18. - G4C04

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

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

19. - G4D02

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

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

20. - G4E10

Why should a series diode be connected between a solar panel and a storage battery that is being charged by the panel?

Select	Answer
A	To prevent overload by regulating the charging voltage
B	To prevent discharge of the battery through the panel during times of low or no illumination
C	To prevent damage to the battery due to excessive voltage at high illumination levels
D	To limit the current flowing from the panel to a safe value

21. - G5A11

What letter is used to represent reactance?

Select	Answer
A	Y
B	Z
C	B
D	X

22. - G5B10

What percentage of power loss is equivalent to a loss of 1 dB?

Select	Answer
A	12.2 percent
B	20.6 percent
C	25.9 percent
D	10.9 percent

23. - G5C04

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

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

24. - G6A08

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

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

25. - G6B05

What is an advantage of using a ferrite core toroidal inductor?

Select	Answer
A	The magnetic properties of the core may be optimized for a specific range of frequencies
B	Large values of inductance may be obtained
C	All these choices are correct
D	Most of the magnetic field is contained in the core

26. - G7A05

What portion of the AC cycle is converted to DC by a half-wave rectifier?

Select	Answer
A	270 degrees
B	180 degrees
C	90 degrees
D	360 degrees

27. - G7B01

What is the purpose of neutralizing an amplifier?

Select	Answer
A	To keep the carrier on frequency
B	To cut off the final amplifier during standby periods
C	To limit the modulation index
D	To eliminate self-oscillations

28. - G7C11

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

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

29. - G8A07

Which of the following phone emissions uses the narrowest bandwidth?

Select	Answer
A	Phase modulation
B	Single sideband
C	Frequency modulation
D	Vestigial sideband

30. - G8B09

Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

Select	Answer
A	It improves impedance matching of the antenna
B	It minimizes power consumption in the receiver
C	It results in the best signal-to-noise ratio
D	It is required by FCC rules

31. - G8C15

What does an FT8 signal report of +3 mean?

Select	Answer
A	The signal is 3 dB over S9
B	The signal is 3 times the noise level of an equivalent SSB signal
C	The signal is S3 (weak signals)
D	The signal-to-noise ratio is equivalent to +3dB in a 2.5 kHz bandwidth

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. - G9B04

What is the radiation pattern of a dipole antenna in free space in a plane containing the conductor?

Select	Answer
A	It has a pair of lobes on one side of the antenna and a single lobe on the other side
B	It is a circle (equal radiation in all directions)
C	It is a figure-eight off both ends of the antenna
D	It is a figure-eight at right angles to the antenna

34. - G9C12

Which of the following is a characteristic of using a gamma match with a Yagi antenna?

Select	Answer
A	It does not require any inductors or capacitors
B	It does not require the driven element to be insulated from the boom
C	All these choices are correct
D	It is useful for matching multiband antennas

35. - G9D08

How does a “screwdriver” mobile antenna adjust its feed point impedance?

Select	Answer
A	By varying its body capacitance
B	By extending and retracting the whip
C	By deploying a capacitance hat
D	By varying the base loading inductance