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. - G0A02

Which of the following is used to determine RF exposure from a transmitted signal?

Select	Answer
A	Its frequency
B	Its power density
C	All these choices are correct
D	Its duty cycle

2. - G0B01

Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?

Select	Answer
A	Only the ground wire
B	Only the neutral wire
C	All wires
D	Only the hot wires

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

4. - G1B01

What is the maximum height above ground for an antenna structure not near a public use airport without requiring notification to the FAA and registration with the FCC?

Select	Answer
A	250 feet
B	100 feet
C	200 feet
D	50 feet

5. - G1C05

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

Select	Answer
A	1500 watts PEP output
B	1000 watts PEP output
C	2000 watts PEP output
D	100 watts PEP output

6. - G1D09

How long is a Certificate of Successful Completion of Examination (CSCE) valid for exam element credit?

Select	Answer
A	For as long as your current license is valid
B	365 days
C	30 days
D	180 days

7. - G1E01

Which of the following would disqualify a third party from participating in sending a message via an amateur station?

Select	Answer
A	The third party is not a US citizen
B	The third party is speaking in a language other than English
C	All these choices are correct
D	The third party’s amateur license has been revoked and not reinstated

8. - G2A04

Which mode is most commonly used for voice communications on the 17- and 12-meter bands?

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

9. - G2B05

When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	2 kHz to 3 kHz
B	Approximately 6 kHz
C	5 Hz to 50 Hz
D	150 Hz to 500 Hz

10. - G2C06

What does the term “zero beat” mean in CW operation?

Select	Answer
A	Matching the speed of the transmitting station
B	Matching the transmit frequency to the frequency of a received signal
C	Sending without error
D	Operating split to avoid interference on frequency

11. - G2D03

What procedure may be used by Volunteer Monitors to localize a station whose continuous carrier is holding a repeater on in their area?

Select	Answer
A	Compare vertical and horizontal signal strengths on the input frequency
B	Compare signal strengths between the input and output of the repeater
C	All these choices are correct
D	Compare beam headings on the repeater input from their home locations with that of other Volunteer Monitors

12. - G2E01

Which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter?

Select	Answer
A	DSB
B	CW
C	USB
D	LSB

13. - G3A03

Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?

Select	Answer
A	28 days
B	1 to 2 hours
C	8 minutes
D	20 to 40 hours

14. - G3B07

What does LUF stand for?

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

15. - G3C02

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

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

16. - G4A07

What happens as a receiver’s noise reduction control level is increased?

Select	Answer
A	Received frequency may become unstable
B	Received frequency may shift several kHz
C	CW signals may become severely attenuated
D	Received signals may become distorted

17. - G4B09

When is an analog multimeter preferred to a digital multimeter?

Select	Answer
A	When adjusting circuits for maximum or minimum values
B	When testing logic circuits
C	When high precision is desired
D	When measuring the frequency of an oscillator

18. - G4C02

Which of the following could be a cause of interference covering a wide range of frequencies?

Select	Answer
A	Using a balun to feed an unbalanced antenna
B	Not using a balun or line isolator to feed balanced antennas
C	Lack of rectification of the transmitter’s signal in power conductors
D	Arcing at a poor electrical connection

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 100 times more powerful
C	It is 20 times less 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	The socket’s wiring may be inadequate for the current drawn by the transceiver
B	The socket is not wired with an RF-shielded power cable
C	Drawing more than 50 watts from this socket could cause the engine to overheat
D	The DC polarity of the socket is reversed from the polarity of modern HF transceivers

21. - G5A12

What occurs in an LC circuit at resonance?

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

22. - G5B10

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

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

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

24. - G6A09

Which of the following describes MOSFET construction?

Select	Answer
A	The gate is separated from the channel by a thin insulating layer
B	The source is formed by depositing metal on silicon
C	The source is separated from the drain by a thin insulating layer
D	The gate is formed by a back-biased junction

25. - G6B10

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

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

26. - G7A07

What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

Select	Answer
A	A series of DC pulses at the same frequency as the AC input
B	A series of DC pulses at twice the frequency of the AC input
C	A sine wave at half the frequency of the AC input
D	A steady DC voltage

27. - G7B02

Which of these classes of amplifiers has the highest efficiency?

Select	Answer
A	Class B
B	Class C
C	Class AB
D	Class A

28. - G7C06

Which of the following is an advantage of a digital signal processing (DSP) filter compared to an analog filter?

Select	Answer
A	The DSP filter is much more effective at VHF frequencies
B	A wide range of filter bandwidths and shapes can be created
C	Mixing products are greatly reduced
D	Fewer digital components are required

29. - G8A02

What is the name of the process that changes the phase angle of an RF signal to convey information?

Select	Answer
A	Phase inversion
B	Phase modulation
C	Phase transformation
D	Phase convolution

30. - G8B04

What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?

Select	Answer
A	Balanced converter
B	Multiplier
C	Mixer
D	Reactance modulator

31. - G8C16

Which of the following provide digital voice modes?

Select	Answer
A	WSPR, MFSK16, and EasyPAL
B	FT8, FT4, and FST4
C	DMR, D-STAR, and SystemFusion
D	Winlink, PACTOR II, and PACTOR III

32. - G9A10

What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?

Select	Answer
A	1:5
B	2:1
C	5:1
D	1:2

33. - G9B09

Which of the following is an advantage of using a horizontally polarized as compared to a vertically polarized HF antenna?

Select	Answer
A	Shorter radials
B	Lower ground losses
C	Lower feed point impedance
D	Lower radiation resistance

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. - G9D08

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

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