US Amateur Radio - General (Element 3, 2015-2019) Practice Test

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US Amateur Radio - General (Element 3, 2015-2019) Practice Test

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1. - G1A03

On which of the following bands is image transmission prohibited?

Select	Answer
A	160 meters
B	12 meters
C	30 meters
D	20 meters

2. - G1B06

When is an amateur station permitted to transmit secret codes?

Select	Answer
A	Only when the information is of a routine, personal nature
B	During a declared communications emergency
C	Only with Special Temporary Authorization from the FCC
D	To control a space station

3. - G1C05

Which of the following is a limitation on 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

4. - G1D04

Which of the following is a requirement for administering a Technician Class license examination?

Select	Answer
A	At least three VEs of Technician Class or higher must observe the examination
B	At least two General Class or higher VEs must be present
C	At least two General Class or higher VEs must be present, but only one need be Extra Class
D	At least three General Class or higher VEs must observe the examination

5. - G1E07

With which foreign countries is third party traffic prohibited, except for messages directly involving emergencies or disaster relief communications?

Select	Answer
A	Every foreign country, unless there is a third party agreement in effect with that country
B	Countries in ITU Region 2
C	Countries in ITU Region 1
D	Any country which is not a member of the International Amateur Radio Union (IARU)

6. - G2A09

Why do most amateur stations use lower sideband on the 160-meter, 75-meter and 40-meter bands?

Select	Answer
A	Current amateur practice is to use lower sideband on these frequency bands
B	Lower sideband is the only sideband legal on these frequency bands
C	Because it is fully compatible with an AM detector
D	Lower sideband is more efficient than upper sideband at these frequencies

7. - G2B01

Which of the following is true concerning access to frequencies in non-emergency situations?

Select	Answer
A	QSOs in progress always have priority
B	Contest operations must always yield to non-contest use of frequencies
C	Except during FCC declared emergencies, no one has priority access to frequencies
D	Nets always have priority

8. - G2C04

What does the Q signal "QRL?" mean?

Select	Answer
A	"Are you listening only for a specific station?"
B	"Will you keep the frequency clear?"
C	"Are you operating full break-in" or "Can you operate full break-in?"
D	"Are you busy?", or "Is this frequency in use?"

9. - G2D03

What skills learned during hidden transmitter hunts are of help to the Amateur Auxiliary?

Select	Answer
A	Direction finding used to locate stations violating FCC Rules
B	Hunters have an opportunity to transmit on non-amateur frequencies
C	Identification of different call signs
D	Identification of out of band operation

10. - G2E07

What segment of the 80-meter band is most commonly used for digital transmissions?

Select	Answer
A	3500 - 3525 kHz
B	3775 - 3825 kHz
C	3700 - 3750 kHz
D	3570 - 3600 kHz

11. - G3A03

Approximately how long does it take the increased ultraviolet and X-ray radiation from solar flares to affect radio propagation on the Earth?

Select	Answer
A	28 days
B	8 minutes
C	20 to 40 hours
D	1 to 2 hours

12. - G3B06

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

Select	Answer
A	They pass through the ionosphere
B	They are bent and trapped in the ionosphere to circle the Earth
C	They are completely absorbed by the ionosphere
D	They are bent back to the Earth

13. - G3C04

What does the term "critical angle" mean as used in radio wave propagation?

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

14. - G4A14

What is likely to happen if a transceiver's ALC system is not set properly when transmitting AFSK signals with the radio using single sideband mode?

Select	Answer
A	Improper action of ALC distorts the signal and can cause spurious emissions
B	When using digital modes, too much ALC activity can cause the transmitter to overheat
C	All of these choices are correct
D	ALC will invert the modulation of the AFSK mode

15. - G4B06

What is an advantage of a digital voltmeter as compared to an analog voltmeter?

Select	Answer
A	Better precision for most uses
B	Better for measuring computer circuits
C	Better for RF measurements
D	Faster response

16. - G4C03

What sound is heard from an audio device or telephone if there is interference from a nearby single sideband phone transmitter?

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

17. - G4D04

What does an S meter measure?

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

18. - G4E09

What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?

Select	Answer
A	0.5 VDC
B	1.38 VDC
C	0.02 VDC
D	0.2 VDC

19. - G5A04

Which of the following causes opposition to the flow of alternating current in a capacitor?

Select	Answer
A	Admittance
B	Reactance
C	Conductance
D	Reluctance

20. - G5B01

What dB change represents a two-times increase or decrease in power?

Select	Answer
A	Approximately 3 dB
B	Approximately 12 dB
C	Approximately 6 dB
D	Approximately 2 dB

21. - G5C07

What is the turns ratio of a transformer used to match an audio amplifier having 600 ohm output impedance to a speaker having 4 ohm impedance?

Select	Answer
A	150 to 1
B	12.2 to 1
C	24.4 to 1
D	300 to 1

22. - G6A04

When is it acceptable to recharge a carbon-zinc primary cell?

Select	Answer
A	Never
B	When the cell is kept warm during the recharging period
C	As long as the voltage has not been allowed to drop below 1.0 volt
D	When a constant current charger is used

23. - G6B15

What is the main reason to use keyed connectors instead of non-keyed types?

Select	Answer
A	Prevention of use by unauthorized persons
B	Higher current carrying capacity
C	Reduced chance of incorrect mating
D	All of these choices are correct

24. - G7A04

What is the peak-inverse-voltage across the rectifier in a half-wave power supply?

Select	Answer
A	Equal to the normal output voltage of the power supply
B	One-half the normal output voltage of the power supply
C	One-half the normal peak output voltage of the power supply
D	Two times the normal peak output voltage of the power supply

25. - G7B08

How is the efficiency of an RF power amplifier determined?

Select	Answer
A	Multiply the RF input power by the reciprocal of the RF output power
B	Divide the RF output power by the DC input power
C	Add the RF input power to the DC output power
D	Divide the DC input power by the DC output power

26. - G7C11

What is meant by the term "software defined radio" (SDR)?

Select	Answer
A	A radio in which most major signal processing functions are performed by software
B	A radio that uses crystal filters designed using software
C	A computer model that can simulate performance of a radio to aid in the design process
D	A radio that provides computer interface for automatic logging of band and frequency

27. - G8A03

What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?

Select	Answer
A	Frequency modulation
B	Frequency convolution
C	Frequency conversion
D	Frequency transformation

28. - G8B02

If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver?

Select	Answer
A	Mixer interference
B	Intermediate interference
C	Image response
D	Quadrature noise

29. - G8C02

How many data bits are sent in a single PSK31 character?

Select	Answer
A	The number varies
B	8
C	5
D	7

30. - G9A08

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

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

31. - G9B05

How does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal dipole HF antenna?

Select	Answer
A	If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated
B	If the antenna is too high, the pattern becomes unpredictable
C	Antenna height has no effect on the pattern
D	If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional

32. - G9C07

What does "front-to-back ratio" mean in reference to a Yagi antenna?

Select	Answer
A	The relative position of the driven element with respect to the reflectors and directors
B	The ratio of forward gain to dipole gain
C	The number of directors versus the number of reflectors
D	The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction

33. - G9D07

Which of the following describes a log periodic antenna?

Select	Answer
A	SWR varies periodically as a function of boom length
B	Length and spacing of the elements increase logarithmically from one end of the boom to the other
C	Gain varies logarithmically as a function of frequency
D	Impedance varies periodically as a function of frequency

34. - G0A09

What type of instrument can be used to accurately measure an RF field?

Select	Answer
A	An oscilloscope with a high-stability crystal marker generator
B	A receiver with an S meter
C	A calibrated field strength meter with a calibrated antenna
D	An SWR meter with a peak-reading function

35. - G0B02

What is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continuous current?

Select	Answer
A	AWG number 8
B	AWG number 16
C	AWG number 12
D	AWG number 20