US Amateur Radio - General (Element 3, 2023-2027) Practice Test

Anonymous User

US Amateur Radio - General (Element 3, 2023-2027) Practice Test

Logging in (or registering) will help the system to select questions that you need to focus on.

1. - G0A07

What is the effect of modulation duty cycle on RF exposure?

Select	Answer
A	A lower duty cycle permits greater power levels to be transmitted
B	A higher duty cycle permits greater power levels to be transmitted
C	Low duty cycle transmitters are exempt from RF exposure evaluation requirements
D	High duty cycle transmitters are exempt from RF exposure requirements

2. - G0B03

Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?

Select	Answer
A	30 amperes
B	20 amperes
C	15 amperes
D	25 amperes

3. - G1A08

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

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

4. - G1B10

What is the power limit for beacon stations?

Select	Answer
A	200 watts PEP output
B	100 watts PEP output
C	10 watts PEP output
D	20 watts PEP output

5. - G1C02

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

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

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

7. - G1E05

What are the restrictions on messages sent to a third party in a country with which there is a Third-Party Agreement?

Select	Answer
A	They must relate to emergencies or disaster relief
B	They must relate to amateur radio, or remarks of a personal character, or messages relating to emergencies or disaster relief
C	They must be for other licensed amateurs
D	The message must be limited to no longer than 1 minute in duration and the name of the third party must be recorded in the station log

8. - G2A05

Which mode of voice communication is most commonly used on the HF amateur bands?

Select	Answer
A	Frequency modulation
B	Double sideband
C	Single phase modulation
D	Single sideband

9. - G2B05

When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	150 Hz to 500 Hz
B	5 Hz to 50 Hz
C	Approximately 6 kHz
D	2 kHz to 3 kHz

10. - G2C03

What does it mean when a CW operator sends “KN” at the end of a transmission?

Select	Answer
A	Operating full break-in
B	Listening only for a specific station or stations
C	No US stations should call
D	Closing station now

11. - G2D09

Which of the following is required when participating in a contest on HF frequencies?

Select	Answer
A	Send a QSL card to the stations worked, or QSL via Logbook of The World
B	Submit a log to the contest sponsor
C	All these choices are correct
D	Identify your station according to normal FCC regulations

12. - G2E06

What is the most common frequency shift for RTTY emissions in the amateur HF bands?

Select	Answer
A	85 Hz
B	425 Hz
C	170 Hz
D	850 Hz

13. - G3A04

Which of the following are the least reliable bands for long-distance communications during periods of low solar activity?

Select	Answer
A	60 meters and 40 meters
B	30 meters and 20 meters
C	80 meters and 160 meters
D	15 meters, 12 meters, and 10 meters

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

15. - G3C05

Why is long-distance communication on the 40-, 60-, 80-, and 160-meter bands more difficult during the day?

Select	Answer
A	The F region is unstable during daylight hours
B	The D region absorbs signals at these frequencies during daylight hours
C	The F region absorbs signals at these frequencies during daylight hours
D	The E region is unstable during daylight hours

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

17. - G4B11

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

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

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	Clearly audible speech
C	On-and-off humming or clicking
D	Distorted speech

19. - G4D11

How close to the upper edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide USB?

Select	Answer
A	At least 3 kHz below the edge of the band
B	At least 1 kHz above the edge of the segment
C	At least 3 kHz above the edge of the band
D	At least 1 kHz below the edge of the segment

20. - G4E03

Which of the following direct, fused power connections would be the best for a 100-watt HF mobile installation?

Select	Answer
A	To the battery using heavy-gauge wire
B	To the battery using insulated heavy duty balanced transmission line
C	To the alternator or generator using insulated heavy duty balanced transmission line
D	To the alternator or generator using heavy-gauge wire

21. - G5A02

What is reactance?

Select	Answer
A	Reinforcement of the flow of alternating current caused by capacitance or inductance
B	Reinforcement of the flow of direct current caused by resistance
C	Opposition to the flow of alternating current caused by capacitance or inductance
D	Opposition to the flow of direct current caused by resistance

22. - G5B09

What is the RMS voltage of a sine wave with a value of 17 volts peak?

Select	Answer
A	24 volts
B	8.5 volts
C	34 volts
D	12 volts

23. - G5C03

What is the total resistance of a 10-, a 20-, and a 50-ohm resistor connected in parallel?

Select	Answer
A	80 ohms
B	5.9 ohms
C	0.17 ohms
D	17 ohms

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	10.5 volts
C	8.5 volts
D	12 volts

25. - G6B03

Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?

Select	Answer
A	Better suited for power supply regulation
B	Low power consumption
C	Better suited for RF amplification
D	High power handling capability

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	180 degrees
D	90 degrees

27. - G7B07

Which of the following are basic components of a sine wave oscillator?

Select	Answer
A	A frequency multiplier and a mixer
B	An amplifier and a divider
C	A filter and an amplifier operating in a feedback loop
D	A circulator and a filter operating in a feed-forward loop

28. - G7C09

What is the phase difference between the I and Q RF signals that software-defined radio (SDR) equipment uses for modulation and demodulation?

Select	Answer
A	180 degrees
B	90 degrees
C	Zero
D	45 degrees

29. - G8A05

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

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

30. - G8B03

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

Select	Answer
A	Phase inversion
B	Frequency inversion
C	Synthesizing
D	Heterodyning

31. - G8C12

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

Select	Answer
A	Viterbi
B	Binary
C	Varicode
D	Volumetric

32. - G9A07

What must be done to prevent standing waves on a feed line connected to an antenna?

Select	Answer
A	The feed line must be an odd number of electrical quarter wavelengths long
B	The antenna feed point impedance must be matched to the characteristic impedance of the feed line
C	The feed line must be an even number of physical half wavelengths long
D	The antenna feed point must be at DC ground potential

33. - G9B05

How does antenna height affect the azimuthal radiation pattern of a horizontal dipole HF antenna at elevation angles higher than about 45 degrees?

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 less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional
C	If the antenna is too high, the pattern becomes unpredictable
D	Antenna height has no effect on the pattern

34. - G9C10

Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?

Select	Answer
A	The spacing of each element along the boom
B	The number of elements on the boom
C	All these choices are correct
D	The physical length of the boom

35. - G9D01

Which of the following antenna types will be most effective as a near vertical incidence skywave (NVIS) antenna for short-skip communications on 40 meters during the day?

Select	Answer
A	A horizontal dipole placed at approximately 1/2 wavelength above the ground
B	A vertical antenna placed between 1/4 and 1/2 wavelength above the ground
C	A vertical dipole placed at approximately 1/2 wavelength above the ground
D	A horizontal dipole placed between 1/10 and 1/4 wavelength above the ground