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. - G0A10

What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?

Select	Answer
A	All these choices are correct
B	Use an antenna with a higher front-to-back ratio
C	Take precautions to ensure that the antenna cannot be pointed in their direction when they are present
D	Change to a non-polarized antenna with higher gain

2. - G0B13

Where should lightning arrestors be located?

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

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

4. - G1B01

What is the maximum height above ground for an antenna structure not near a public use airport without requiring notification to the FAA and registration with the FCC?

Select	Answer
A	100 feet
B	200 feet
C	250 feet
D	50 feet

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	19.6 kilobaud
C	56 kilobaud
D	300 baud

6. - G1D10

What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?

Select	Answer
A	21 years
B	There is no age limit
C	16 years
D	18 years

7. - G1E08

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

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

8. - G2A01

Which mode is most commonly used for voice communications on frequencies of 14 MHz or higher?

Select	Answer
A	Lower sideband
B	Suppressed 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	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. - G2D06

How is a directional antenna pointed when making a “long-path” contact with another station?

Select	Answer
A	Along the gray line
B	Toward the rising sun
C	180 degrees from the station’s short-path heading
D	Toward the north

12. - G2E12

Which of the following describes Winlink?

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

13. - G3A05

What is the solar flux index?

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

14. - G3B11

What happens to HF propagation when the LUF exceeds the MUF?

Select	Answer
A	Propagation via ordinary skywave communications is not possible over that path
B	Double-hop propagation along the path is more common
C	HF communications over the path are enhanced
D	Propagation over the path on all HF frequencies is enhanced

15. - G3C03

Why is skip propagation via the F2 region longer than that via the other ionospheric regions?

Select	Answer
A	Because of temperature inversions
B	Because it is the densest
C	Because of the Doppler effect
D	Because it is the highest

16. - G4A05

Why is automatic level control (ALC) used with an RF power amplifier?

Select	Answer
A	To prevent excessive drive
B	To reduce harmonic radiation
C	To increase overall efficiency
D	To balance the transmitter audio frequency response

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	All these choices are correct
C	Transmitter
D	Receiver

18. - G4C05

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

Select	Answer
A	The ground wire has high impedance on that frequency
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 rod is resonant

19. - G4D03

What is the effect of an incorrectly adjusted speech processor?

Select	Answer
A	All these choices are correct
B	Excess intermodulation products
C	Distorted speech
D	Excessive background noise

20. - G4E02

What is the purpose of a corona ball on an HF mobile antenna?

Select	Answer
A	To increase the “Q” of the antenna
B	To reduce the chance of damage if the antenna should strike an object
C	To reduce RF voltage discharge from the tip of the antenna while transmitting
D	To narrow the operating bandwidth of the antenna

21. - G5A05

How does an inductor react to AC?

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

22. - G5B03

How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?

Select	Answer
A	200 watts
B	3200 watts
C	400 watts
D	0.5 watts

23. - G5C05

Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?

Select	Answer
A	To prevent parasitic oscillations due to resistive losses in the primary
B	To ensure that the volume of the primary winding is equal to the volume of the secondary winding
C	To improve the coupling between the primary and secondary
D	To accommodate the higher current of the primary

24. - G6A05

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

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

25. - G6B11

What is an SMA connector?

Select	Answer
A	A type of push-on connector intended for high-voltage applications
B	A type-S to type-M adaptor
C	A small threaded connector suitable for signals up to several GHz
D	A connector designed for serial multiple access signals

26. - G7A11

Which symbol in figure G7-1 represents an NPN junction transistor?

Select	Answer
A	Symbol 11
B	Symbol 2
C	Symbol 1
D	Symbol 7

27. - G7B06

What is a shift register?

Select	Answer
A	An analog mixer
B	A clocked array of circuits that passes data in steps along the array
C	A digital mixer
D	An array of operational amplifiers used for tri-state arithmetic operations

28. - G7C11

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

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

29. - G8A01

How is direct binary FSK modulation generated?

Select	Answer
A	By changing an oscillator’s frequency directly with a digital control signal
B	By reconfiguring the CW keying input to act as a tone generator
C	By keying an FM transmitter with a sub-audible tone
D	By using a transceiver’s computer data interface protocol to change frequencies

30. - G8B08

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

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

31. - G8C10

How does forward error correction (FEC) allow the receiver to correct data errors?

Select	Answer
A	By controlling transmitter output power for optimum signal strength
B	By using the Varicode character set
C	By using a parity bit with each character
D	By transmitting redundant information with the data

32. - G9A09

What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?

Select	Answer
A	1:2
B	2:1
C	1:4
D	4:1

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 too high, the pattern becomes unpredictable
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 less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional

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 dBi is 2.15 dB lower
C	Gain in dBd is 1.25 dBd lower
D	Gain in dBi is 2.15 dB higher

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

Figure G7-1