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. - G0B05

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

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

3. - G1A10

What portion of the 10-meter band is available for repeater use?

Select	Answer
A	The portion above 29.5 MHz
B	The entire band
C	The portion between 28.1 MHz and 28.2 MHz
D	The portion between 28.3 MHz and 28.5 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 FCC
D	The ITU

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	100 watts PEP output
C	2000 watts PEP output
D	1000 watts PEP output

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	Only those of the remote station’s country
C	Only those of the FCC
D	Those of the remote station’s country and the FCC’s third-party regulations

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	On any band segment where digital operation is permitted
D	Only in the non-phone Extra Class segments of the bands

8. - G2A03

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

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

9. - G2B11

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

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

10. - G2C02

What should you do if a CW station sends “QRS?”

Select	Answer
A	Increase your power
B	Send slower
C	Repeat everything twice
D	Change frequency

11. - G2D08

Why do many amateurs keep a station log?

Select	Answer
A	The FCC requires a log of all international third-party traffic
B	To help with a reply if the FCC requests information about your station
C	The FCC requires a log of all international contacts
D	The log provides evidence of operation needed to renew a license without retest

12. - G2E06

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

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

13. - G3A12

What does the K-index measure?

Select	Answer
A	The relative position of sunspots on the surface of the Sun
B	The short-term stability of Earth’s geomagnetic field
C	The short-term stability of the Sun’s magnetic field
D	The solar radio flux at Boulder, Colorado

14. - G3B08

What does MUF stand for?

Select	Answer
A	The Minimum Usable Frequency during a 24-hour period
B	The Minimum Usable Frequency for communications between two points
C	The Maximum Usable Frequency for communications between two points
D	The Maximum Usable Frequency during a 24-hour period

15. - G3C09

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

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

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. - G4B13

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

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

18. - G4C07

Why should soldered joints not be used in lightning protection ground connections?

Select	Answer
A	All these choices are correct
B	A soldered joint will likely be destroyed by the heat of a lightning strike
C	Solder flux will prevent a low conductivity connection
D	Solder has too high a dielectric constant to provide adequate lightning protection

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 100 times more powerful
B	It is 20 times less powerful
C	It is 20 times more powerful
D	It is 10 times less powerful

20. - G4E11

What precaution should be taken when connecting a solar panel to a lithium iron phosphate battery?

Select	Answer
A	Ensure the battery is placed terminals-up
B	A series resistor must be in place
C	The solar panel must have a charge controller
D	Ground the solar panel outer metal framework

21. - G5A10

Which of the following devices can be used for impedance matching at radio frequencies?

Select	Answer
A	A Pi-network
B	All these choices are correct
C	A transformer
D	A length of transmission line

22. - G5B14

What is the output PEP of 500 volts peak-to-peak across a 50-ohm load?

Select	Answer
A	2500 watts
B	5000 watts
C	625 watts
D	8.75 watts

23. - G5C07

What transformer turns ratio matches an antenna’s 600-ohm feed point impedance to a 50-ohm coaxial cable?

Select	Answer
A	144 to 1
B	24 to 1
C	12 to 1
D	3.5 to 1

24. - G6A03

What is the approximate forward threshold voltage of a germanium diode?

Select	Answer
A	0.3 volts
B	0.1 volt
C	0.7 volts
D	1.0 volts

25. - G6B07

Which of the following describes a type N connector?

Select	Answer
A	A low noise figure VHF connector
B	A nickel plated version of the PL-259
C	A small bayonet connector used for data circuits
D	A moisture-resistant RF connector useful to 10 GHz

26. - G7A06

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

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

27. - G7B06

What is a shift register?

Select	Answer
A	A clocked array of circuits that passes data in steps along the array
B	A digital mixer
C	An array of operational amplifiers used for tri-state arithmetic operations
D	An analog mixer

28. - G7C05

Which of the following is characteristic of a direct digital synthesizer (DDS)?

Select	Answer
A	Relatively high-power output
B	Variable output frequency with the stability of a crystal oscillator
C	Extremely narrow tuning range
D	Pure sine wave output

29. - G8A14

What is link margin?

Select	Answer
A	The opposite of fade margin
B	The difference between received power level and minimum required signal level at the input to the receiver
C	Transmit power minus receiver sensitivity
D	Receiver sensitivity plus 3 dB

30. - G8B06

What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?

Select	Answer
A	16 kHz
B	3 kHz
C	8 kHz
D	5 kHz

31. - G8C07

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

Select	Answer
A	AMTOR
B	FT8
C	MFSK32
D	MSK144

32. - G9A02

What is the relationship between high standing wave ratio (SWR) and transmission line loss?

Select	Answer
A	High SWR reduces the relative effect of transmission line loss
B	There is no relationship between transmission line loss and SWR
C	High SWR makes it difficult to measure transmission line loss
D	High SWR increases loss in a lossy transmission line

33. - G9B03

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

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

34. - G9C01

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

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

35. - G9D05

What is an advantage of vertically stacking horizontally polarized Yagi antennas?

Select	Answer
A	It narrows the main lobe in azimuth
B	It allows quick selection of vertical or horizontal polarization
C	It allows simultaneous vertical and horizontal polarization
D	It narrows the main lobe in elevation