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. - G0A09

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

Select	Answer
A	A calibrated field strength meter with a calibrated antenna
B	A receiver with digital signal processing (DSP) noise reduction
C	An SWR meter with a peak-reading function
D	An oscilloscope with a high-stability crystal marker generator

2. - G0B07

Which of these choices should be observed when climbing a tower using a safety harness?

Select	Answer
A	Ensure that all heavy tools are securely fastened to the harness
B	Always hold on to the tower with one hand
C	All these choices are correct
D	Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life

3. - G1A04

Which of the following amateur bands is restricted to communication only on specific channels, rather than frequency ranges?

Select	Answer
A	12 meters
B	11 meters
C	60 meters
D	30 meters

4. - G1B03

Which of the following is a purpose of a beacon station as identified in the FCC rules?

Select	Answer
A	Transmission of bulletins of general interest to amateur radio licensees
B	Observation of propagation and reception
C	Automatic identification of repeaters
D	All these choices are correct

5. - G1C08

What is the maximum symbol rate permitted for RTTY or data emission transmitted at frequencies below 28 MHz?

Select	Answer
A	1200 baud
B	300 baud
C	19.6 kilobaud
D	56 kilobaud

6. - G1D12

When operating a station in South America by remote control over the internet from the US, what regulations apply?

Select	Answer
A	Those of the remote station’s country and the FCC’s third-party regulations
B	Only those of the FCC
C	Only those of the remote station’s country
D	Those of both the remote station’s country and the FCC

7. - G1E12

When may third-party messages be transmitted via remote control?

Select	Answer
A	Under no circumstances except for emergencies
B	Only when the message is intended for third parties in areas where licensing is controlled by the FCC
C	Under any circumstances in which third party messages are permitted by FCC rules
D	Only when the message is intended for licensed radio amateurs

8. - G2A04

Which mode is most commonly used for voice communications on the 17- and 12-meter bands?

Select	Answer
A	Double sideband
B	Lower sideband
C	Suppressed sideband
D	Upper 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	5 Hz to 50 Hz
B	2 kHz to 3 kHz
C	Approximately 6 kHz
D	150 Hz to 500 Hz

10. - G2C11

What does the Q signal “QRV” mean?

Select	Answer
A	There is interference on the frequency
B	I am ready to receive
C	You are sending too fast
D	I am quitting for the day

11. - G2D07

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

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

12. - G2E04

Which of the following is good practice when choosing a transmitting frequency to answer a station calling CQ using FT8?

Select	Answer
A	Always call on the station’s frequency
B	Find a clear frequency during the alternate time slot to the calling station
C	Find a clear frequency during the same time slot as the calling station
D	Call on any frequency in the waterfall except the station’s frequency

13. - G3A04

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

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

14. - G3B02

What factors affect the MUF?

Select	Answer
A	Solar radiation and ionospheric disturbances
B	All these choices are correct
C	Path distance and location
D	Time of day and season

15. - G3C08

Why are HF scatter signals in the skip zone usually weak?

Select	Answer
A	Signals are scattered from the magnetosphere, which is not a good reflector
B	Propagation is via ground waves, which absorb most of the signal energy
C	Propagation is via ducts in the F region, which absorb most of the energy
D	Only a small part of the signal energy is scattered into the skip zone

16. - G4A01

What is the purpose of the notch filter found on many HF transceivers?

Select	Answer
A	To restrict the transmitter voice bandwidth
B	To remove interfering splatter generated by signals on adjacent frequencies
C	To eliminate receiver interference from impulse noise sources
D	To reduce interference from carriers in the receiver passband

17. - G4B06

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

Select	Answer
A	Better for measuring computer circuits
B	Higher precision
C	Faster response
D	Less prone to overload

18. - G4C03

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

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

19. - G4D07

How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9?

Select	Answer
A	Approximately 8 times
B	Approximately 2 times
C	Approximately 1.5 times
D	Approximately 4 times

20. - G4E10

Why should a series diode be connected between a solar panel and a storage battery that is being charged by the panel?

Select	Answer
A	To limit the current flowing from the panel to a safe value
B	To prevent damage to the battery due to excessive voltage at high illumination levels
C	To prevent overload by regulating the charging voltage
D	To prevent discharge of the battery through the panel during times of low or no illumination

21. - G5A04

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

Select	Answer
A	Conductance
B	Reactance
C	Admittance
D	Reluctance

22. - G5B12

What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?

Select	Answer
A	173 volts
B	692 volts
C	346 volts
D	245 volts

23. - G5C07

What transformer turns ratio matches an antenna’s 600-ohm feed point impedance to a 50-ohm coaxial cable?

Select	Answer
A	144 to 1
B	24 to 1
C	12 to 1
D	3.5 to 1

24. - G6A02

What is an advantage of batteries with low internal resistance?

Select	Answer
A	High discharge current
B	Long life
C	High voltage
D	Rapid recharge

25. - G6B12

Which of these connector types is commonly used for low frequency or dc signal connections to a transceiver?

Select	Answer
A	BNC
B	RCA Phono
C	Type N
D	PL-259

26. - G7A03

Which type of rectifier circuit uses two diodes and a center-tapped transformer?

Select	Answer
A	Full-wave
B	Half-wave
C	Full-wave bridge
D	Synchronous

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	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

28. - G7C14

The bandwidth of a band-pass filter is measured between what two frequencies?

Select	Answer
A	Pole and zero
B	Upper and lower half-power
C	Cutoff and rolloff
D	Image and harmonic

29. - G8A05

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

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

30. - G8B08

Why is it important to know the duty cycle of the mode you are using when transmitting?

Select	Answer
A	To aid in tuning your transmitter
B	To allow time for the other station to break in during a transmission
C	Some modes have high duty cycles that could exceed the transmitter’s average power rating
D	To prevent overmodulation

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	More nodes reduce overall microwave out of band interference
C	Having more nodes increases signal strengths
D	If one node fails, a packet may still reach its target station via an alternate node

32. - G9A03

What is the nominal characteristic impedance of “window line” transmission line?

Select	Answer
A	100 ohms
B	450 ohms
C	75 ohms
D	50 ohms

33. - G9B01

What is a characteristic of a random-wire HF antenna connected directly to the transmitter?

Select	Answer
A	It must be longer than 1 wavelength
B	Station equipment may carry significant RF current
C	It produces only vertically polarized radiation
D	It is more effective on the lower HF bands than on the higher bands

34. - G9C09

In free space, how does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?

Select	Answer
A	Approximately 1.5 dB higher
B	Approximately 6 dB higher
C	Approximately 9 dB higher
D	Approximately 3 dB higher

35. - G9D11

Which of the following is a disadvantage of multiband antennas?

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