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. - G0A11

What precaution should be taken if you install an indoor transmitting antenna?

Select	Answer
A	Position the antenna along the edge of a wall to reduce parasitic radiation
B	Make sure that MPE limits are not exceeded in occupied areas
C	Locate the antenna close to your operating position to minimize feed-line radiation
D	Make sure the antenna is properly shielded

2. - G0B07

Which of these choices should be observed when climbing a tower using a safety harness?

Select	Answer
A	Always hold on to the tower with one hand
B	All these choices are correct
C	Ensure that all heavy tools are securely fastened to the harness
D	Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life

3. - G1A08

Which HF bands have segments exclusively allocated to Amateur Extra licensees?

Select	Answer
A	All HF bands except 160 meters and 10 meters
B	80 meters, 40 meters, 20 meters, and 15 meters
C	60 meters, 30 meters, 17 meters, and 12 meters
D	All HF bands

4. - G1B03

Which of the following is a purpose of a beacon station as identified in the FCC rules?

Select	Answer
A	Transmission of bulletins of general interest to amateur radio licensees
B	All these choices are correct
C	Automatic identification of repeaters
D	Observation of propagation and reception

5. - G1C10

What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 10-meter band?

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

6. - G1D10

What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?

Select	Answer
A	16 years
B	There is no age limit
C	18 years
D	21 years

7. - G1E12

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

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

8. - G2A07

Which of the following statements is true of single sideband (SSB)?

Select	Answer
A	Only one sideband is transmitted; the other sideband and carrier are suppressed
B	SSB is the only voice mode authorized on the 20-, 15-, and 10-meter amateur bands
C	SSB is the only voice mode authorized on the 160-, 75-, and 40-meter amateur bands
D	Only one sideband and the carrier are transmitted; the other sideband is suppressed

9. - G2B08

What is the voluntary band plan restriction for US stations transmitting within the 48 contiguous states in the 50.1 MHz to 50.125 MHz band segment?

Select	Answer
A	Only contacts with stations not within the 48 contiguous states
B	Only contacts with other stations within the 48 contiguous states
C	Only digital contacts
D	Only SSTV contacts

10. - G2C10

What does the Q signal “QRN” mean?

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

11. - G2D11

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

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

12. - G2E11

What is the primary purpose of an Amateur Radio Emergency Data Network (AREDN) mesh network?

Select	Answer
A	To provide real time propagation data by monitoring amateur radio transmissions worldwide
B	To provide DX spotting reports to aid contesters and DXers
C	To provide high-speed data services during an emergency or community event
D	To provide FM repeater coverage in remote areas

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. - G3B05

How does the ionosphere affect radio waves with frequencies below the MUF and above the LUF?

Select	Answer
A	They are refracted and trapped in the ionosphere to circle Earth
B	They are amplified by interaction with the ionosphere
C	They are refracted back to Earth
D	They pass through the ionosphere

15. - G3C02

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

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

16. - G4A03

How does a noise blanker work?

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

17. - G4B12

What effect can strong signals from nearby transmitters have on an antenna analyzer?

Select	Answer
A	All these choices are correct
B	Desensitization which can cause intermodulation products which interfere with impedance readings
C	Generation of harmonics which interfere with frequency readings
D	Received power that interferes with SWR readings

18. - G4C05

What is a possible cause of high voltages that produce RF burns?

Select	Answer
A	Flat braid rather than round wire has been used for the ground wire
B	The ground wire has high impedance on that frequency
C	Insulated wire has been used for the ground wire
D	The ground rod is resonant

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	7.175 MHz to 7.178 MHz
B	7.1765 MHz to 7.1795 MHz
C	7.178 MHz to 7.184 MHz
D	7.178 MHz to 7.181 MHz

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

21. - G5A03

Which of the following is opposition to the flow of alternating current in an inductor?

Select	Answer
A	Reactance
B	Conductance
C	Reluctance
D	Admittance

22. - G5B10

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

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

23. - G5C09

What is the capacitance of three 100-microfarad capacitors connected in series?

Select	Answer
A	300 microfarads
B	0.33 microfarads
C	3.0 microfarads
D	33.3 microfarads

24. - G6A05

What is the approximate forward threshold voltage of a silicon junction diode?

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

25. - G6B11

What is an SMA connector?

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

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	90 degrees
D	270 degrees

27. - G7B05

How many states does a 3-bit binary counter have?

Select	Answer
A	6
B	16
C	3
D	8

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	Fewer digital components are required
C	A wide range of filter bandwidths and shapes can be created
D	The DSP filter is much more effective at VHF frequencies

29. - G8A04

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

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

30. - G8B07

What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

Select	Answer
A	416.7 Hz
B	101.75 Hz
C	60 kHz
D	5 kHz

31. - G8C03

What part of a packet radio frame contains the routing and handling information?

Select	Answer
A	Header
B	Trailer
C	Directory
D	Preamble

32. - G9A08

If the SWR on an antenna feed line is 5:1, and a matching network at the transmitter end of the feed line is adjusted to present a 1:1 SWR to the transmitter, what is the resulting SWR on the feed line?

Select	Answer
A	Between 1:1 and 5:1 depending on the characteristic impedance of the line
B	1:1
C	Between 1:1 and 5:1 depending on the reflected power at the transmitter
D	5:1

33. - G9B02

Which of the following is a common way to adjust the feed point impedance of an elevated quarter-wave ground-plane vertical antenna to be approximately 50 ohms?

Select	Answer
A	Coil the radials
B	Lengthen the radials beyond one wavelength
C	Slope the radials downward
D	Slope the radials upward

34. - G9C04

How does antenna gain in dBi compare to gain stated in dBd for the same antenna?

Select	Answer
A	Gain in dBi is 2.15 dB higher
B	Gain in dBd is 1.25 dBd lower
C	Gain in dBd is 1.25 dBd higher
D	Gain in dBi is 2.15 dB lower

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 simultaneous vertical and horizontal polarization
C	It allows quick selection of vertical or horizontal polarization
D	It narrows the main lobe in elevation