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. - G0A04

What does “time averaging” mean when evaluating RF radiation exposure?

Select	Answer
A	The total RF exposure averaged over a certain period
B	The average time it takes RF radiation to have any long-term effect on the body
C	The total time of the exposure
D	The average amount of power developed by the transmitter over a specific 24-hour period

2. - G0B13

Where should lightning arrestors be located?

Select	Answer
A	Where the feed lines enter the building
B	On the antenna, opposite the feed point
C	In series with each ground lead
D	At the closest power pole ground electrode

3. - G1A08

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

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

4. - G1B04

Which of the following transmissions is permitted for all amateur stations?

Select	Answer
A	Unidentified transmissions of less than 10 seconds duration for test purposes only
B	Automatic retransmission of other amateur signals by any amateur station
C	Encrypted messages, if not intended to facilitate a criminal act
D	Occasional retransmission of weather and propagation forecast information from US government stations

5. - G1C09

What is the maximum power limit on the 60-meter band?

Select	Answer
A	10 watts RMS
B	ERP of 100 watts PEP with respect to a dipole
C	ERP of 100 watts PEP with respect to an isotropic antenna
D	1500 watts PEP

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

7. - G1E10

Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz?

Select	Answer
A	These frequencies are set aside for emergency operations
B	A system of automatic digital stations operates on those frequencies
C	These frequencies are set aside for bulletins from the FCC
D	A system of propagation beacon stations operates on those frequencies

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. - G2B07

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

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

10. - G2C07

When sending CW, what does a “C” mean when added to the RST report?

Select	Answer
A	Chirpy or unstable signal
B	Report was read from an S meter rather than estimated
C	Key clicks
D	100 percent copy

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

12. - G2E05

What is the standard sideband for JT65, JT9, FT4, or FT8 digital signal when using AFSK?

Select	Answer
A	SSB
B	USB
C	DSB
D	LSB

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 the Sun’s magnetic field
C	The short-term stability of Earth’s geomagnetic field
D	The solar radio flux at Boulder, Colorado

14. - G3B10

What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the E region?

Select	Answer
A	12,000 miles
B	2,500 miles
C	1,200 miles
D	180 miles

15. - G3C04

What does the term “critical angle” mean, as applied to radio wave propagation?

Select	Answer
A	The lowest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions
B	The short path azimuth of a distant station
C	The highest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions
D	The long path azimuth of a distant station

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

17. - G4B01

What item of test equipment contains horizontal and vertical channel amplifiers?

Select	Answer
A	A signal generator
B	An ammeter
C	An ohmmeter
D	An oscilloscope

18. - G4C09

How can the effects of ground loops be minimized?

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

19. - G4D01

What is the purpose of a speech processor in a transceiver?

Select	Answer
A	Prevent distortion of voice signals
B	Increase the apparent loudness of transmitted voice signals
C	Decrease high-frequency voice output to prevent out-of-band operation
D	Increase transmitter bass response for more natural-sounding SSB signals

20. - G4E11

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

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

21. - G5A03

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

Select	Answer
A	Conductance
B	Admittance
C	Reactance
D	Reluctance

22. - G5B14

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

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

23. - G5C05

Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?

Select	Answer
A	To improve the coupling between the primary and secondary
B	To accommodate the higher current of the primary
C	To prevent parasitic oscillations due to resistive losses in the primary
D	To ensure that the volume of the primary winding is equal to the volume of the secondary winding

24. - G6A12

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

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

25. - G6B04

What is a typical upper frequency limit for low SWR operation of 50-ohm BNC connectors?

Select	Answer
A	500 MHz
B	50 MHz
C	4 GHz
D	40 GHz

26. - G7A05

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

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

27. - G7B02

Which of these classes of amplifiers has the highest efficiency?

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

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. - G8A02

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

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

30. - G8B13

Which of the following is an odd-order intermodulation product of frequencies F1 and F2?

Select	Answer
A	3F1-F2
B	All these choices are correct
C	5F1-3F2
D	2F1-F2

31. - G8C01

On what band do amateurs share channels with the unlicensed Wi-Fi service?

Select	Answer
A	432 MHz
B	2.4 GHz
C	10.7 GHz
D	902 MHz

32. - G9A02

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

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

33. - G9B12

What is the approximate length for a 1/4 wave monopole antenna cut for 28.5 MHz?

Select	Answer
A	11 feet
B	8 feet
C	21 feet
D	16 feet

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 higher
C	Gain in dBd is 1.25 dBd lower
D	Gain in dBi is 2.15 dB lower

35. - G9D10

In which direction or directions does an electrically small loop (less than 1/10 wavelength in circumference) have nulls in its radiation pattern?

Select	Answer
A	Broadside to the loop
B	Electrically small loops are omnidirectional
C	In the plane of the loop
D	Broadside and in the plane of the loop