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. - G0A01

What is one way that RF energy can affect human body tissue?

Select	Answer
A	It heats body tissue
B	It causes the blood count to reach a dangerously low level
C	It causes radiation poisoning
D	It cools body tissue

2. - G0B13

Where should lightning arrestors be located?

Select	Answer
A	At the closest power pole ground electrode
B	Where the feed lines enter the building
C	On the antenna, opposite the feed point
D	In series with each ground lead

3. - G1A06

Which of the following applies when the FCC rules designate the amateur service as a secondary user on a band?

Select	Answer
A	Amateur stations must record the call sign of the primary service station before operating on a frequency assigned to that station
B	Amateur stations may use the band only during emergencies
C	Amateur stations may only operate during specific hours of the day, while primary users are permitted 24-hour use of the band
D	Amateur stations must not cause harmful interference to primary users and must accept interference from primary users

4. - G1B03

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

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

5. - G1C07

What must be done before using a new digital protocol on the air?

Select	Answer
A	Submit a rule-making proposal to the FCC describing the codes and methods of the technique
B	Publicly document the technical characteristics of the protocol
C	Obtain an experimental license from the FCC
D	Type-certify equipment to FCC standards

6. - G1D12

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

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

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	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
B	They must be for other licensed amateurs
C	They must relate to amateur radio, or remarks of a personal character, or messages relating to emergencies or disaster relief
D	They must relate to emergencies or disaster relief

8. - G2A02

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

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

9. - G2B02

What is the first thing you should do if you are communicating with another amateur station and hear a station in distress break in?

Select	Answer
A	Immediately decrease power to avoid interfering with the station in distress
B	Inform your local emergency coordinator
C	Acknowledge the station in distress and determine what assistance may be needed
D	Immediately cease all transmissions

10. - G2C08

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

Select	Answer
A	KN
B	BK
C	SK
D	AR

11. - G2D07

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

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

12. - G2E12

Which of the following describes Winlink?

Select	Answer
A	An amateur radio wireless network to send and receive email on the internet
B	A wireless network capable of both VHF and HF band operation
C	All of the above
D	A form of Packet Radio

13. - G3A05

What is the solar flux index?

Select	Answer
A	A measure of the highest frequency that is useful for ionospheric propagation between two points on Earth
B	A count of sunspots that is adjusted for solar emissions
C	Another name for the American sunspot number
D	A measure of solar radiation with a wavelength of 10.7 centimeters

14. - G3B08

What does MUF stand for?

Select	Answer
A	The Minimum Usable Frequency for communications between two points
B	The Minimum Usable Frequency during a 24-hour period
C	The Maximum Usable Frequency during a 24-hour period
D	The Maximum Usable Frequency for communications between two points

15. - G3C10

What is near vertical incidence skywave (NVIS) propagation?

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

16. - G4A10

What is the function of an electronic keyer?

Select	Answer
A	Automatic transmit/receive switching
B	Computer interface for PSK and RTTY operation
C	Automatic generation of dots and dashes for CW operation
D	To allow time for switching the antenna from the receiver to the transmitter

17. - G4B07

What signals are used to conduct a two-tone test?

Select	Answer
A	Two audio signals of the same frequency shifted 90 degrees
B	Two audio frequency range square wave signals of equal amplitude
C	Two swept frequency tones
D	Two non-harmonically related audio signals

18. - G4C08

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

Select	Answer
A	Ground the center conductor of the audio cable causing the interference
B	Place a ferrite choke on the cable
C	Add an additional insulating jacket to the cable
D	Connect the center conductor to the shield of all cables to short circuit the RFI signal

19. - G4D10

How close to the lower edge of a band’s 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 1 kHz below the edge of the segment
C	At least 3 kHz above the edge of the segment
D	At least 3 kHz below the edge of the segment

20. - G4E06

What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?

Select	Answer
A	Operating bandwidth may be very limited
B	Short antennas are more likely to cause distortion of transmitted signals
C	Harmonic radiation may increase
D	Q of the antenna will be very low

21. - G5A06

How does a capacitor react to AC?

Select	Answer
A	As the amplitude of the applied AC increases, the reactance decreases
B	As the amplitude of the applied AC increases, the reactance increases
C	As the frequency of the applied AC increases, the reactance increases
D	As the frequency of the applied AC increases, the reactance decreases

22. - G5B14

What is the output PEP of 500 volts peak-to-peak across a 50-ohm load?

Select	Answer
A	2500 watts
B	5000 watts
C	625 watts
D	8.75 watts

23. - G5C10

What is the inductance of three 10-millihenry inductors connected in parallel?

Select	Answer
A	3.3 millihenries
B	30 millihenries
C	3.3 henries
D	0.30 henries

24. - G6A12

What is the primary purpose of a screen grid in a vacuum tube?

Select	Answer
A	To increase the control grid resistance
B	To decrease plate resistance
C	To reduce grid-to-plate capacitance
D	To increase efficiency

25. - G6B01

What determines the performance of a ferrite core at different frequencies?

Select	Answer
A	Its thickness
B	Its conductivity
C	The ratio of outer diameter to inner diameter
D	The composition, or “mix,” of materials used

26. - G7A07

What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

Select	Answer
A	A sine wave at half the frequency of the AC input
B	A steady DC voltage
C	A series of DC pulses at the same frequency as the AC input
D	A series of DC pulses at twice the frequency of the AC input

27. - G7B04

In a Class A amplifier, what percentage of the time does the amplifying device conduct?

Select	Answer
A	50%
B	More than 50% but less than 100%
C	Less than 50%
D	100%

28. - G7C14

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

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

29. - G8A02

What is the name of the process that changes the phase angle of an RF signal to convey information?

Select	Answer
A	Phase modulation
B	Phase convolution
C	Phase inversion
D	Phase transformation

30. - G8B12

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

Select	Answer
A	Intermodulation
B	Detection
C	Rolloff
D	Heterodyning

31. - G8C11

How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?

Select	Answer
A	High and low
B	On and off
C	Mark and space
D	Dot and dash

32. - G9A03

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

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

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

34. - G9C04

How does antenna gain in dBi compare to gain stated in dBd for the same antenna?

Select	Answer
A	Gain in dBd is 1.25 dBd higher
B	Gain in dBd is 1.25 dBd lower
C	Gain in dBi is 2.15 dB lower
D	Gain in dBi is 2.15 dB higher

35. - G9D05

What is an advantage of vertically stacking horizontally polarized Yagi antennas?

Select	Answer
A	It narrows the main lobe in azimuth
B	It allows quick selection of vertical or horizontal polarization
C	It allows simultaneous vertical and horizontal polarization
D	It narrows the main lobe in elevation