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	20 meters
B	12 meters
C	160 meters
D	30 meters

2. - G1B06

When is an amateur station permitted to transmit secret codes?

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

3. - G1C01

What is the maximum transmitting power an amateur station may use on 10.140 MHz?

Select	Answer
A	1500 watts PEP output
B	1000 watts PEP output
C	2000 watts PEP output
D	200 watts PEP output

4. - G1D10

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

Select	Answer
A	12 years
B	There is no age limit
C	21 years
D	18 years

5. - G1E02

When may a 10-meter repeater retransmit the 2-meter signal from a station having a Technician Class control operator?

Select	Answer
A	Only if the 10-meter repeater control operator holds at least a General Class license
B	Only during an FCC declared general state of communications emergency
C	Under no circumstances
D	Only if the station on 10-meters is operating under a Special Temporary Authorization allowing such retransmission

6. - G2A02

Which of the following modes is most commonly used for voice communications on the 160-meter, 75-meter, and 40-meter bands?

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

7. - G2B05

What is the customary minimum frequency separation between SSB signals under normal conditions?

Select	Answer
A	Approximately 10 kHz
B	Between 150 and 500 Hz
C	Approximately 6 kHz
D	Approximately 3 kHz

8. - G2C04

What does the Q signal "QRL?" mean?

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

9. - G2D11

Which HF antenna would be the best to use for minimizing interference?

Select	Answer
A	An omnidirectional antenna
B	An isotropic antenna
C	A quarter-wave vertical antenna
D	A directional antenna

10. - G2E10

Which of the following is a way to establish contact with a digital messaging system gateway station?

Select	Answer
A	Respond when the station broadcasts its SSID
B	Send an email to the system control operator
C	Transmit a connect message on the station's published frequency
D	Send QRL in Morse code

11. - G3A11

Approximately how long is the typical sunspot cycle?

Select	Answer
A	8 minutes
B	11 years
C	40 hours
D	28 days

12. - G3B07

What does LUF stand for?

Select	Answer
A	The Longest Universal Function for communications between two points
B	The Lowest Usable Frequency during a 24 hour period
C	The Lowest Usable Frequency for communications between two points
D	The Longest Universal Function during a 24 hour period

13. - G3C09

What type of radio wave propagation allows a signal to be detected at a distance too far for ground wave propagation but too near for normal sky-wave propagation?

Select	Answer
A	Scatter
B	Sporadic-E skip
C	Faraday rotation
D	Short-path skip

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	ALC will invert the modulation of the AFSK mode
C	When using digital modes, too much ALC activity can cause the transmitter to overheat
D	All of these choices are correct

15. - G4B10

Which of the following can be determined with a directional wattmeter?

Select	Answer
A	RF interference
B	Radio wave propagation
C	Antenna front-to-back ratio
D	Standing wave ratio

16. - G4C08

Which of the following would reduce RF interference caused by common-mode current on an audio cable?

Select	Answer
A	Adding shunt inductors to the conductors
B	Placing a ferrite choke around the cable
C	Adding series capacitors to the conductors
D	Adding an additional insulating jacket to the cable

17. - G4D10

How close to the lower edge of the 40-meter General Class phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?

Select	Answer
A	At least 1 kHz above the edge of the segment
B	At least 3 kHz above the edge of the segment
C	At least 3 kHz below the edge of the segment
D	Your displayed carrier frequency may be set at the edge of the segment

18. - G4E01

What is the purpose of a capacitance hat on a mobile antenna?

Select	Answer
A	To increase the power handling capacity of a whip antenna
B	To allow remote tuning
C	To electrically lengthen a physically short antenna
D	To allow automatic band changing

19. - G5A08

Why is impedance matching important?

Select	Answer
A	So the source can deliver maximum power to the load
B	To ensure that the resistance and reactance in the circuit are equal
C	To ensure that there is less resistance than reactance in the circuit
D	So the load will draw minimum power from the source

20. - G5B01

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

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

21. - G5C03

Which of the following components should be added to an existing resistor to increase the resistance?

Select	Answer
A	A resistor in series
B	A capacitor in series
C	A capacitor in parallel
D	A resistor in parallel

22. - G6A18

What is an advantage of using a ferrite core toroidal inductor?

Select	Answer
A	The magnetic properties of the core may be optimized for a specific range of frequencies
B	Large values of inductance may be obtained
C	Most of the magnetic field is contained in the core
D	All of these choices are correct

23. - G6B13

Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?

Select	Answer
A	DB-25
B	RJ-11
C	Octal
D	PL-259

24. - G7A04

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

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

25. - G7B05

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

Select	Answer
A	3
B	6
C	16
D	8

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. - G8A10

What is meant by the term flat-topping when referring to a single sideband phone transmission?

Select	Answer
A	Signal distortion caused by insufficient collector current
B	Signal distortion caused by excessive drive
C	The transmitter's automatic level control (ALC) is properly adjusted
D	The transmitter's carrier is properly suppressed

28. - G8B03

What is another term for the mixing of two RF signals?

Select	Answer
A	Heterodyning
B	Phase inverting
C	Cancellation
D	Synthesizing

29. - G8C03

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

Select	Answer
A	Directory
B	Header
C	Preamble
D	Footer

30. - G9A15

What is the effect of transmission line loss on SWR measured at the input to the line?

Select	Answer
A	The higher the transmission line loss, the more the SWR will read artificially low
B	Transmission line loss does not affect the SWR measurement
C	The higher the transmission line loss, the more the SWR will read artificially high
D	The higher the transmission line loss, the more accurate the SWR measurement will be

31. - G9B01

What is one disadvantage of a directly fed random-wire HF antenna?

Select	Answer
A	You may experience RF burns when touching metal objects in your station
B	It must be longer than 1 wavelength
C	It produces only vertically polarized radiation
D	It is more effective on the lower HF bands than on the higher bands

32. - G9C12

Which of the following is an advantage of using a gamma match for impedance matching of a Yagi antenna to 50 ohm coax feed line?

Select	Answer
A	It does not require any inductors or capacitors
B	It does not require that the elements be insulated from the boom
C	All of these choices are correct
D	It is useful for matching multiband antennas

33. - G9D07

Which of the following describes a log periodic antenna?

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

34. - G0A07

What effect does transmitter duty cycle have when evaluating RF exposure?

Select	Answer
A	Low duty cycle transmitters are exempt from RF exposure evaluation requirements
B	A lower transmitter duty cycle permits greater short-term exposure levels
C	A higher transmitter duty cycle permits greater short-term exposure levels
D	High duty cycle transmitters are exempt from RF exposure requirements

35. - G0B11

Which of the following is good practice for lightning protection grounds?

Select	Answer
A	Lightning grounds must be connected to all ungrounded wiring
B	They must be bonded to all buried water and gas lines
C	Bends in ground wires must be made as close as possible to a right angle
D	They must be bonded together with all other grounds