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

2. - G0B10

Which of the following is a danger from lead-tin solder?

Select	Answer
A	Tin in the solder can “cold flow,” causing shorts in the circuit
B	Lead can contaminate food if hands are not washed carefully after handling the solder
C	RF energy can convert the lead into a poisonous gas
D	High voltages can cause lead-tin solder to disintegrate suddenly

3. - G1A08

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

Select	Answer
A	All HF bands
B	All HF bands except 160 meters and 10 meters
C	60 meters, 30 meters, 17 meters, and 12 meters
D	80 meters, 40 meters, 20 meters, and 15 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 IEEE
B	The ITU
C	The FCC
D	The control operator

5. - G1C09

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

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

6. - G1D05

When operating a US station by remote control from outside the country, what license is required of the control operator?

Select	Answer
A	A US operator/primary station license
B	Only a license from the foreign country, as long as the call sign includes identification of portable operation in the US
C	A license from the foreign country and a special remote station permit from the FCC
D	Only an appropriate US operator/primary license and a special remote station permit from the FCC

7. - G1E03

What is required to conduct communications with a digital station operating under automatic control outside the automatic control band segments?

Select	Answer
A	The interrogating transmission must be made by another automatically controlled station
B	No third-party traffic may be transmitted
C	The control operator of the interrogating station must hold an Amateur Extra class license
D	The station initiating the contact must be under local or remote control

8. - G2A11

Generally, who should respond to a station in the contiguous 48 states calling “CQ DX”?

Select	Answer
A	Any caller is welcome to respond
B	Any stations outside the lower 48 states
C	Only stations in Germany
D	Only contest stations

9. - G2B01

Which of the following is true concerning access to frequencies?

Select	Answer
A	Nets have priority
B	QSOs in progress have priority
C	Contest operations should yield to non-contest use of frequencies
D	Except during emergencies, no amateur station has priority access to any frequency

10. - G2C05

What is the best speed to use when answering a CQ in Morse code?

Select	Answer
A	At the standard calling speed of 5 wpm
B	At the standard calling speed of 10 wpm
C	The fastest speed at which you are comfortable copying, but no slower than the CQ
D	The fastest speed at which you are comfortable copying, but no faster than the CQ

11. - G2D07

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

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

12. - G2E08

In what segment of the 20-meter band are most digital mode operations commonly found?

Select	Answer
A	Between 14.070 MHz and 14.100 MHz
B	At the top of the SSB phone segment, near 14.325 MHz
C	At the bottom of the slow-scan TV segment, near 14.230 MHz
D	In the middle of the CW segment, near 14.100 MHz

13. - G3A10

What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

Select	Answer
A	Cyclic variation in Earth’s radiation belts
B	Long term oscillations in the upper atmosphere
C	Rotation of the Sun’s surface layers around its axis
D	The position of the Moon in its orbit

14. - G3B06

What usually happens to radio waves with frequencies below the LUF?

Select	Answer
A	They pass through the ionosphere
B	They are attenuated before reaching the destination
C	They are refracted back to Earth
D	They are refracted and trapped in the ionosphere to circle Earth

15. - G3C02

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

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

16. - G4A09

What is the purpose of delaying RF output after activating a transmitter’s keying line to an external amplifier?

Select	Answer
A	To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output
B	To allow time for the amplifier power supply to reach operating level
C	To prevent key clicks on CW
D	To prevent transient overmodulation

17. - G4B11

Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?

Select	Answer
A	All these choices are correct
B	Receiver
C	Antenna and feed line
D	Transmitter

18. - G4C03

What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter?

Select	Answer
A	A steady hum whenever the transmitter is on the air
B	On-and-off humming or clicking
C	Clearly audible speech
D	Distorted speech

19. - G4D04

What does an S meter measure?

Select	Answer
A	Impedance
B	Carrier suppression
C	Received signal strength
D	Transmitter power output

20. - G4E02

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

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

21. - G5A12

What occurs in an LC circuit at resonance?

Select	Answer
A	The circuit radiates all its energy in the form of radio waves
B	Resistance is cancelled
C	Inductive reactance and capacitive reactance cancel
D	Current and voltage are equal

22. - G5B04

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

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

23. - G5C14

Which of the following components should be added to an inductor to increase the inductance?

Select	Answer
A	An inductor in parallel
B	A capacitor in parallel
C	A capacitor in series
D	An inductor in series

24. - G6A01

What is the minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery?

Select	Answer
A	6 volts
B	8.5 volts
C	12 volts
D	10.5 volts

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. - G7A06

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

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

27. - G7B05

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

Select	Answer
A	16
B	8
C	3
D	6

28. - G7C10

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

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

29. - G8A11

What is the modulation envelope of an AM signal?

Select	Answer
A	The bandwidth of the modulated signal
B	Spurious signals that envelop nearby frequencies
C	The carrier frequency that contains the signal
D	The waveform created by connecting the peak values of the modulated signal

30. - G8B04

What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?

Select	Answer
A	Reactance modulator
B	Mixer
C	Multiplier
D	Balanced converter

31. - G8C09

Which is true of mesh network microwave nodes?

Select	Answer
A	Links between two nodes in a network may have different frequencies and bandwidths
B	Having more nodes increases signal strengths
C	If one node fails, a packet may still reach its target station via an alternate node
D	More nodes reduce overall microwave out of band interference

32. - G9A09

What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?

Select	Answer
A	4:1
B	1:2
C	2:1
D	1:4

33. - G9B10

What is the approximate length for a 1/2 wave dipole antenna cut for 14.250 MHz?

Select	Answer
A	24 feet
B	16 feet
C	33 feet
D	8 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 dBi is 2.15 dB lower
C	Gain in dBd is 1.25 dBd lower
D	Gain in dBd is 1.25 dBd higher

35. - G9D04

What is the primary function of antenna traps?

Select	Answer
A	To enable multiband operation
B	To prevent out-of-band operation
C	To provide balanced feed point impedance
D	To notch spurious frequencies