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. - G0A01

What is one way that RF energy can affect human body tissue?

Select	Answer
A	It heats body tissue
B	It causes radiation poisoning
C	It cools body tissue
D	It causes the blood count to reach a dangerously low level

2. - G0B06

Which of the following is covered by the National Electrical Code?

Select	Answer
A	RF exposure limits of the human body
B	Acceptable modulation limits
C	Acceptable bandwidth limits
D	Electrical safety of the station

3. - G1A02

On which of the following bands is phone operation prohibited?

Select	Answer
A	160 meters
B	12 meters
C	17 meters
D	30 meters

4. - G1B02

With which of the following conditions must beacon stations comply?

Select	Answer
A	All these choices are correct
B	The frequency must be coordinated with the National Beacon Organization
C	No more than one beacon station may transmit in the same band from the same station location
D	The frequency must be posted on the internet or published in a national periodical

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	100 watts PEP output
D	2000 watts PEP output

6. - G1D04

Who must observe the administration of a Technician class license examination?

Select	Answer
A	At least three Volunteer Examiners of Technician class
B	At least two Volunteer Examiners of Technician class or higher
C	At least three Volunteer Examiners of General class or higher
D	At least two Volunteer Examiners of General class or higher

7. - G1E12

When may third-party messages be transmitted via remote control?

Select	Answer
A	Only when the message is intended for third parties in areas where licensing is controlled by the FCC
B	Under any circumstances in which third party messages are permitted by FCC rules
C	Under no circumstances except for emergencies
D	Only when the message is intended for licensed radio amateurs

8. - G2A09

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

Select	Answer
A	Because it is fully compatible with an AM detector
B	It is commonly accepted amateur practice
C	Lower sideband is the only sideband legal on these frequency bands
D	Lower sideband is more efficient than upper sideband at these frequencies

9. - G2B03

What is good amateur practice if propagation changes during a contact creating interference from other stations using the frequency?

Select	Answer
A	Switch to the opposite sideband
B	Attempt to resolve the interference problem with the other stations in a mutually acceptable manner
C	Decrease power and continue to transmit
D	Advise the interfering stations that you are on the frequency and that you have priority

10. - G2C04

What does the Q signal “QRL?” mean?

Select	Answer
A	“Are you busy?” or “Is this frequency in use?”
B	“Will you keep the frequency clear?”
C	“Are you listening only for a specific station?”
D	“Are you operating full break-in?” or “Can you operate full break-in?”

11. - G2D11

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

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

12. - G2E07

Which of the following is required when using FT8?

Select	Answer
A	Receiver attenuator set to -12 dB
B	A vertically polarized antenna
C	A special hardware modem
D	Computer time accurate to within approximately 1 second

13. - G3A06

What is a geomagnetic storm?

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

14. - G3B07

What does LUF stand for?

Select	Answer
A	The Lowest Usable Frequency for communications between two specific points
B	Lowest Usable Frequency during the past 60 minutes
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. - G3C06

What is a characteristic of HF scatter?

Select	Answer
A	There are very large, sudden swings in signal strength
B	Scatter propagation occurs only at night
C	Signals have a fluttering sound
D	Phone signals have high intelligibility

16. - G4A03

How does a noise blanker work?

Select	Answer
A	By temporarily increasing received bandwidth
B	By redirecting noise pulses into a filter capacitor
C	By clipping noise peaks
D	By reducing receiver gain during a noise pulse

17. - G4B13

Which of the following can be measured with an antenna analyzer?

Select	Answer
A	Gain of a directional antenna
B	Power output from a transmitter
C	Impedance of coaxial cable
D	Front-to-back ratio of an antenna

18. - G4C09

How can the effects of ground loops be minimized?

Select	Answer
A	Connect all ground conductors in series
B	Avoid using lock washers and star washers when making ground connections
C	Connect the AC neutral conductor to the ground wire
D	Bond equipment enclosures together

19. - G4D09

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

Select	Answer
A	14.344 MHz to 14.347 MHz
B	14.347 MHz to 14.350 MHz
C	14.3455 MHz to 14.3485 MHz
D	14.347 MHz to 14.647 MHz

20. - G4E02

What is the purpose of a corona ball on an HF mobile antenna?

Select	Answer
A	To narrow the operating bandwidth of the antenna
B	To reduce the chance of damage if the antenna should strike an object
C	To increase the “Q” of the antenna
D	To reduce RF voltage discharge from the tip of the antenna while transmitting

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 arithmetic mean of the inductance and capacitance
D	Impedance is equal to the geometric mean of the inductance and capacitance

22. - G5B13

What is the output PEP of an unmodulated carrier if the average power is 1060 watts?

Select	Answer
A	530 watts
B	2120 watts
C	1500 watts
D	1060 watts

23. - G5C10

What is the inductance of three 10-millihenry inductors connected in parallel?

Select	Answer
A	30 millihenries
B	3.3 millihenries
C	0.30 henries
D	3.3 henries

24. - G6A10

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

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

25. - G6B11

What is an SMA connector?

Select	Answer
A	A connector designed for serial multiple access signals
B	A type of push-on connector intended for high-voltage applications
C	A type-S to type-M adaptor
D	A small threaded connector suitable for signals up to several GHz

26. - G7A08

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

Select	Answer
A	High-frequency operation allows the use of smaller components
B	Inherently more stable
C	Faster switching time makes higher output voltage possible
D	Fewer circuit components are required

27. - G7B08

How is the efficiency of an RF power amplifier determined?

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

28. - G7C10

What is an advantage of using I-Q modulation with software-defined radios (SDRs)?

Select	Answer
A	Automatic conversion of the signal from digital to analog
B	All types of modulation can be created with appropriate processing
C	The need for high resolution analog-to-digital converters is eliminated
D	Minimum detectible signal level is reduced

29. - G8A09

What type of modulation is used by FT8?

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

30. - G8B02

What is the term for interference from a signal at twice the IF frequency from the desired signal?

Select	Answer
A	Intermediate interference
B	Image response
C	Quadrature response
D	Mixer interference

31. - G8C02

Which digital mode is used as a low-power beacon for assessing HF propagation?

Select	Answer
A	WSPR
B	MFSK16
C	PSK31
D	SSB-SC

32. - G9A05

How does the attenuation of coaxial cable change with increasing frequency?

Select	Answer
A	Attenuation follows Marconi’s Law of Attenuation
B	Attenuation increases
C	Attenuation is independent of frequency
D	Attenuation decreases

33. - G9B08

How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?

Select	Answer
A	It steadily decreases
B	It is unaffected by the location of the feed point
C	It peaks at about 1/8 wavelength from the end
D	It steadily increases

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	The number of elements on the boom
B	All these choices are correct
C	The spacing of each element along the boom
D	The physical length of the boom

35. - G9D09

What is the primary use of a Beverage antenna?

Select	Answer
A	Directional receiving for MF and low HF bands
B	Portable direction finding at lower HF frequencies
C	Portable direction finding at higher HF frequencies
D	Directional transmitting for low HF bands