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. - G0A11

What precaution should be taken if you install an indoor transmitting antenna?

Select	Answer
A	Make sure the antenna is properly shielded
B	Make sure that MPE limits are not exceeded in occupied areas
C	Position the antenna along the edge of a wall to reduce parasitic radiation
D	Locate the antenna close to your operating position to minimize feed-line radiation

2. - G0B12

What is the purpose of a power supply interlock?

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

3. - G1A07

On which amateur frequencies in the 10-meter band may stations with a General class control operator transmit CW emissions?

Select	Answer
A	28.000 MHz to 28.300 MHz only
B	28.000 MHz to 28.025 MHz only
C	The entire band
D	28.025 MHz to 28.300 MHz only

4. - G1B03

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

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

5. - G1C08

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

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

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

7. - G1E03

What is required to conduct communications with a digital station operating under automatic control outside the automatic control band segments?

Select	Answer
A	No third-party traffic may be transmitted
B	The interrogating transmission must be made by another automatically controlled station
C	The control operator of the interrogating station must hold an Amateur Extra class license
D	The station initiating the contact must be under local or remote control

8. - G2A07

Which of the following statements is true of single sideband (SSB)?

Select	Answer
A	Only one sideband is transmitted; the other sideband and carrier are suppressed
B	SSB is the only voice mode authorized on the 160-, 75-, and 40-meter amateur bands
C	SSB is the only voice mode authorized on the 20-, 15-, and 10-meter amateur bands
D	Only one sideband and the carrier are transmitted; the other sideband is suppressed

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	Immediately cease all transmissions
D	Acknowledge the station in distress and determine what assistance may be needed

10. - G2C08

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

Select	Answer
A	KN
B	SK
C	BK
D	AR

11. - G2D10

What is QRP operation?

Select	Answer
A	Low-power transmit operation
B	Remote piloted model control
C	Traffic relay procedure net operation
D	Transmission using Quick Response Protocol

12. - G2E13

What is another name for a Winlink Remote Message Server?

Select	Answer
A	Terminal Node Controller
B	Gateway
C	RJ-45
D	Printer/Server

13. - G3A13

What does the A-index measure?

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

14. - G3B07

What does LUF stand for?

Select	Answer
A	Lowest Usable Frequency during the past 60 minutes
B	The Lowest Usable Frequency for communications between two specific points
C	Lowest Usable Frequency for communications to any point outside a 100-mile radius
D	The Lowest Usable Frequency during a 24-hour period

15. - G3C07

What makes HF scatter signals often sound distorted?

Select	Answer
A	The ionospheric region involved is unstable
B	Energy is scattered into the skip zone through several different paths
C	The E region is not present
D	Ground waves are absorbing much of the signal

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 plate current without exceeding maximum allowable grid current
C	Highest plate voltage while minimizing grid current
D	Minimum SWR on the antenna

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	Transmitter
D	All these choices are correct

18. - G4C01

Which of the following might be useful in reducing RF interference to audio frequency circuits?

Select	Answer
A	Bypass inductor
B	Bypass capacitor
C	Reverse-biased diode
D	Forward-biased diode

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 3 kHz above the edge of the band
C	At least 1 kHz below the edge of the segment
D	At least 1 kHz above the edge of the segment

20. - G4E01

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

Select	Answer
A	To electrically lengthen a physically short antenna
B	To reduce radiation resistance
C	To lower the radiation angle
D	To increase the power handling capacity of a whip antenna

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 frequency of the applied AC increases, the reactance increases
C	As the frequency of the applied AC increases, the reactance decreases
D	As the amplitude of the applied AC increases, the reactance increases

22. - G5B11

What is the ratio of PEP to average power for an unmodulated carrier?

Select	Answer
A	1.414
B	2.00
C	0.707
D	1.00

23. - G5C13

Which of the following components should be added to a capacitor to increase the capacitance?

Select	Answer
A	An inductor in parallel
B	A capacitor in series
C	An inductor in series
D	A capacitor in parallel

24. - G6A01

What is the minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery?

Select	Answer
A	10.5 volts
B	6 volts
C	8.5 volts
D	12 volts

25. - G6B10

How does a ferrite bead or core reduce common-mode RF current on the shield of a coaxial cable?

Select	Answer
A	It converts common-mode current to differential mode current
B	By creating an out-of-phase current to cancel the common-mode current
C	Ferrites expel magnetic fields
D	By creating an impedance in the current’s path

26. - G7A03

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

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

27. - G7B10

Which of the following describes a linear amplifier?

Select	Answer
A	A Class C high efficiency amplifier
B	An amplifier in which the output preserves the input waveform
C	Any RF power amplifier used in conjunction with an amateur transceiver
D	An amplifier used as a frequency multiplier

28. - G7C11

Which of these functions is performed by software in a software-defined radio (SDR)?

Select	Answer
A	Modulation
B	Detection
C	All these choices are correct
D	Filtering

29. - G8A10

What is meant by the term “flat-topping,” when referring to an amplitude-modulated phone signal?

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

30. - G8B12

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

Select	Answer
A	Rolloff
B	Heterodyning
C	Intermodulation
D	Detection

31. - G8C02

Which digital mode is used as a low-power beacon for assessing HF propagation?

Select	Answer
A	WSPR
B	MFSK16
C	SSB-SC
D	PSK31

32. - G9A03

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

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

33. - G9B08

How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?

Select	Answer
A	It peaks at about 1/8 wavelength from the end
B	It steadily decreases
C	It is unaffected by the location of the feed point
D	It steadily increases

34. - G9C02

What is the approximate length of the driven element of a Yagi antenna?

Select	Answer
A	1/2 wavelength
B	1/4 wavelength
C	1 wavelength
D	3/4 wavelength

35. - G9D04

What is the primary function of antenna traps?

Select	Answer
A	To notch spurious frequencies
B	To provide balanced feed point impedance
C	To prevent out-of-band operation
D	To enable multiband operation