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

2. - G0B12

What is the purpose of a power supply interlock?

Select	Answer
A	To shut down the unit if it becomes too hot
B	To ensure that dangerous voltages are removed if the cabinet is opened
C	To shut off the power supply if too much voltage is produced
D	To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty

3. - G1A02

On which of the following bands is phone operation prohibited?

Select	Answer
A	30 meters
B	17 meters
C	12 meters
D	160 meters

4. - G1B05

Which of the following one-way transmissions are permitted?

Select	Answer
A	Unidentified test transmissions of less than 10 seconds in duration
B	Transmissions to assist with learning the International Morse code
C	Regular transmissions offering equipment for sale, if intended for amateur radio use
D	All these choices are correct

5. - G1C02

What is the maximum transmitter power an amateur station may use on the 12-meter band?

Select	Answer
A	50 watts PEP output
B	200 watts PEP output
C	1500 watts PEP output
D	An effective radiated power equivalent to 100 watts from a half-wave dipole

6. - G1D04

Who must observe the administration of a Technician class license examination?

Select	Answer
A	At least three Volunteer Examiners of General class or higher
B	At least two Volunteer Examiners of Technician class or higher
C	At least three Volunteer Examiners of Technician class
D	At least two Volunteer Examiners of General class or higher

7. - G1E08

What is the maximum PEP output allowed for spread spectrum transmissions?

Select	Answer
A	100 milliwatts
B	1500 watts
C	100 watts
D	10 watts

8. - G2A10

Which of the following statements is true of VOX operation versus PTT operation?

Select	Answer
A	The received signal is more natural sounding
B	It allows “hands free” operation
C	It occupies less bandwidth
D	It provides more power output

9. - G2B04

When selecting a CW transmitting frequency, what minimum separation from other stations should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	150 Hz to 500 Hz
B	1 kHz to 3 kHz
C	3 kHz to 6 kHz
D	5 Hz to 50 Hz

10. - G2C08

What prosign is sent to indicate the end of a formal message when using CW?

Select	Answer
A	KN
B	BK
C	AR
D	SK

11. - G2D11

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

Select	Answer
A	To follow standard radiogram structure
B	To be sure the contact will count for award programs
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 DX spotting reports to aid contesters and DXers
B	To provide FM repeater coverage in remote areas
C	To provide real time propagation data by monitoring amateur radio transmissions worldwide
D	To provide high-speed data services during an emergency or community event

13. - G3A13

What does the A-index measure?

Select	Answer
A	The solar radio flux at Boulder, Colorado
B	The long-term stability of Earth’s geomagnetic field
C	The amount of polarization of the Sun’s electric field
D	The relative position of sunspots on the surface of the Sun

14. - G3B03

Which frequency will have the least attenuation for long-distance skip propagation?

Select	Answer
A	Just above the LUF
B	Just below the MUF
C	Just above the critical frequency
D	Just below the critical frequency

15. - G3C10

What is near vertical incidence skywave (NVIS) propagation?

Select	Answer
A	Propagation near the MUF
B	Double hop propagation near the LUF
C	Long path HF propagation at sunrise and sunset
D	Short distance MF or HF propagation at high elevation angles

16. - G4A08

What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?

Select	Answer
A	Desired power output without exceeding maximum allowable plate current
B	Minimum SWR on the antenna
C	Minimum plate current without exceeding maximum allowable grid current
D	Highest plate voltage while minimizing grid current

17. - G4B11

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

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

18. - G4C05

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

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

19. - G4D05

How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?

Select	Answer
A	It is 20 times more powerful
B	It is 20 times less powerful
C	It is 10 times less powerful
D	It is 100 times more powerful

20. - G4E04

Why should DC power for a 100-watt HF transceiver not be supplied by a vehicle’s auxiliary power socket?

Select	Answer
A	The socket is not wired with an RF-shielded power cable
B	The DC polarity of the socket is reversed from the polarity of modern HF transceivers
C	Drawing more than 50 watts from this socket could cause the engine to overheat
D	The socket’s wiring may be inadequate for the current drawn by the transceiver

21. - G5A10

Which of the following devices can be used for impedance matching at radio frequencies?

Select	Answer
A	A length of transmission line
B	All these choices are correct
C	A Pi-network
D	A transformer

22. - G5B10

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

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

23. - G5C02

What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?

Select	Answer
A	The input voltage is multiplied by 4
B	The input voltage is divided by 4
C	Additional resistance must be added in series with the primary to prevent overload
D	Additional resistance must be added in parallel with the secondary to prevent overload

24. - G6A05

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

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

25. - G6B06

What kind of device is an integrated circuit operational amplifier?

Select	Answer
A	Analog
B	Digital
C	Programmable Logic
D	MMIC

26. - G7A04

What is characteristic of a half-wave rectifier in a power supply?

Select	Answer
A	Only one diode is required
B	More current can be drawn from the half-wave rectifier
C	The ripple frequency is twice that of a full-wave rectifier
D	The output voltage is two times the peak input voltage

27. - 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	Add the RF input power to the DC output power
C	Divide the RF output power by the DC input power
D	Divide the DC input power by the DC output power

28. - G7C13

What term specifies a filter’s maximum ability to reject signals outside its passband?

Select	Answer
A	Insertion loss
B	Rolloff
C	Notch depth
D	Ultimate rejection

29. - G8A05

What type of modulation varies the instantaneous power level of the RF signal?

Select	Answer
A	Frequency modulation
B	Phase modulation
C	Power modulation
D	Amplitude modulation

30. - G8B12

What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?

Select	Answer
A	Detection
B	Rolloff
C	Heterodyning
D	Intermodulation

31. - G8C12

Which type of code is used for sending characters in a PSK31 signal?

Select	Answer
A	Varicode
B	Binary
C	Viterbi
D	Volumetric

32. - G9A01

Which of the following factors determine the characteristic impedance of a parallel conductor feed line?

Select	Answer
A	The distance between the centers of the conductors and the length of the line
B	The distance between the centers of the conductors and the radius of the conductors
C	The frequency of the signal and the length of the line
D	The radius of the conductors and the frequency of the signal

33. - G9B06

Where should the radial wires of a ground-mounted vertical antenna system be placed?

Select	Answer
A	As high as possible above the ground
B	Parallel to the antenna element
C	At the center of the antenna
D	On the surface or buried a few inches below the ground

34. - G9C08

What is meant by the “main lobe” of a directive antenna?

Select	Answer
A	The direction of maximum radiated field strength from the antenna
B	The magnitude of the maximum vertical angle of radiation
C	The point of maximum current in a radiating antenna element
D	The maximum voltage standing wave point on a radiating element

35. - G9D11

Which of the following is a disadvantage of multiband antennas?

Select	Answer
A	They must be fed with open wire line
B	They present low impedance on all design frequencies
C	They have poor harmonic rejection
D	They must be used with an antenna tuner