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

2. - G0B12

What is the purpose of a power supply interlock?

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

3. - G1A04

Which of the following amateur bands is restricted to communication only on specific channels, rather than frequency ranges?

Select	Answer
A	30 meters
B	11 meters
C	12 meters
D	60 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?

Select	Answer
A	The FCC
B	The ITU
C	The IEEE
D	The control operator

5. - G1C08

What is the maximum symbol rate permitted for RTTY or data emission transmitted at frequencies below 28 MHz?

Select	Answer
A	19.6 kilobaud
B	56 kilobaud
C	300 baud
D	1200 baud

6. - G1D12

When operating a station in South America by remote control over the internet from the US, what regulations apply?

Select	Answer
A	Those of both the remote station’s country and the FCC
B	Those of the remote station’s country and the FCC’s third-party regulations
C	Only those of the remote station’s country
D	Only those of the FCC

7. - G1E02

When may a 10-meter repeater retransmit the 2-meter signal from a station that has a Technician class control operator?

Select	Answer
A	Only during an FCC-declared general state of communications emergency
B	Under no circumstances
C	Only if the station on 10-meters is operating under a Special Temporary Authorization allowing such retransmission
D	Only if the 10-meter repeater control operator holds at least a General class license

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

9. - G2B07

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

Select	Answer
A	Listen on the frequency for at least two minutes to be sure it is clear
B	All these choices are correct
C	Identify your station by transmitting your call sign at least 3 times
D	Follow the voluntary band plan

10. - G2C03

What does it mean when a CW operator sends “KN” at the end of a transmission?

Select	Answer
A	Listening only for a specific station or stations
B	Operating full break-in
C	No US stations should call
D	Closing station now

11. - G2D07

Which of the following are examples of the NATO Phonetic Alphabet?

Select	Answer
A	America, Boston, Canada, Denmark
B	Able, Baker, Charlie, Dog
C	Alpha, Bravo, Charlie, Delta
D	Adam, Boy, Charles, David

12. - G2E09

How do you join a contact between two stations using the PACTOR protocol?

Select	Answer
A	Send broadcast packets containing your call sign while in MONITOR mode
B	Send a NAK code
C	Transmit a steady carrier until the PACTOR protocol times out and disconnects
D	Joining an existing contact is not possible, PACTOR connections are limited to two stations

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	VHF/UHF ducting is disturbed
C	HF communication is disturbed
D	HF communication is improved

14. - G3B07

What does LUF stand for?

Select	Answer
A	Lowest Usable Frequency during the past 60 minutes
B	The Lowest Usable Frequency during a 24-hour period
C	The Lowest Usable Frequency for communications between two specific points
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 lowest frequency which is refracted back to Earth
C	The frequency at which the signal-to-noise ratio approaches unity
D	The frequency at which the signal-to-noise ratio is 6 dB

16. - G4A04

What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier’s TUNE control?

Select	Answer
A	A slow, rhythmic oscillation
B	A pronounced peak
C	A pronounced dip
D	No change will be observed

17. - G4B05

Why do voltmeters have high input impedance?

Select	Answer
A	It decreases the loading on circuits being measured
B	It allows for higher voltages to be safely measured
C	It improves the frequency response
D	It improves the resolution of the readings

18. - G4C06

What is a possible effect of a resonant ground connection?

Select	Answer
A	Corrosion of the ground rod
B	High RF voltages on the enclosures of station equipment
C	Overheating of ground straps
D	A ground loop

19. - G4D08

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

Select	Answer
A	7.178 MHz to 7.181 MHz
B	7.175 MHz to 7.178 MHz
C	7.178 MHz to 7.184 MHz
D	7.1765 MHz to 7.1795 MHz

20. - G4E03

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

Select	Answer
A	To the battery using insulated heavy duty balanced transmission line
B	To the alternator or generator using heavy-gauge wire
C	To the battery using heavy-gauge wire
D	To the alternator or generator using insulated heavy duty balanced transmission line

21. - G5A11

What letter is used to represent reactance?

Select	Answer
A	Z
B	X
C	B
D	Y

22. - G5B04

How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?

Select	Answer
A	2.4 watts
B	6 watts
C	24 watts
D	60 watts

23. - G5C10

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

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

24. - G6A12

What is the primary purpose of a screen grid in a vacuum tube?

Select	Answer
A	To increase the control grid resistance
B	To reduce grid-to-plate capacitance
C	To decrease plate resistance
D	To increase efficiency

25. - G6B10

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

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

26. - G7A11

Which symbol in figure G7-1 represents an NPN junction transistor?

Select	Answer
A	Symbol 1
B	Symbol 7
C	Symbol 2
D	Symbol 11

27. - G7B03

Which of the following describes the function of a two-input AND gate?

Select	Answer
A	Output is low when either or both inputs are high
B	Output is low only when both inputs are high
C	Output is high only when both inputs are high
D	Output is high when either or both inputs are low

28. - G7C06

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

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

29. - G8A04

What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?

Select	Answer
A	Pulse modulation
B	Amplitude modulation
C	Phase modulation
D	Multiplex modulation

30. - G8B05

Which intermodulation products are closest to the original signal frequencies?

Select	Answer
A	Second harmonics
B	Even-order
C	Intercept point
D	Odd-order

31. - G8C16

Which of the following provide digital voice modes?

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

32. - G9A03

What is the nominal characteristic impedance of “window line” transmission line?

Select	Answer
A	75 ohms
B	50 ohms
C	450 ohms
D	100 ohms

33. - G9B03

Which of the following best describes the radiation pattern of a quarter-wave ground-plane vertical antenna?

Select	Answer
A	Isotropic
B	Omnidirectional in azimuth
C	Hemispherical
D	Bi-directional in azimuth

34. - G9C01

Which of the following would increase the bandwidth of a Yagi antenna?

Select	Answer
A	Loading coils in series with the element
B	Closer element spacing
C	Larger-diameter elements
D	Tapered-diameter elements

35. - G9D03

In which direction is the maximum radiation from a VHF/UHF “halo” antenna?

Select	Answer
A	Omnidirectional in the plane of the halo
B	Opposite the feed point
C	Broadside to the plane of the halo
D	On the same side as the feed point

Figure G7-1