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. - 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	High duty cycle transmitters are exempt from RF exposure requirements
D	Low duty cycle transmitters are exempt from RF exposure evaluation requirements

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. - G1A09

Which of the following frequencies is within the General class portion of the 15-meter band?

Select	Answer
A	24900 kHz
B	18155 kHz
C	14250 kHz
D	21300 kHz

4. - G1B10

What is the power limit for beacon stations?

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

5. - G1C03

What is the maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band?

Select	Answer
A	5.6 kHz
B	1.8 kHz
C	2.8 kHz
D	3 kHz

6. - G1D11

What action is required to obtain a new General class license after a previously held license has expired and the two-year grace period has passed?

Select	Answer
A	The applicant must show proof of the appropriate expired license grant and pass the current Element 2 exam
B	There are no requirements other than being able to show a copy of the expired license
C	They must have a letter from the FCC showing they once held an amateur or commercial license
D	Contact the FCC to have the license reinstated

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 control operator of the interrogating station must hold an Amateur Extra class license
C	The interrogating transmission must be made by another automatically controlled station
D	The station initiating the contact must be under local or remote control

8. - G2A02

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

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

9. - G2B08

What is the voluntary band plan restriction for US stations transmitting within the 48 contiguous states in the 50.1 MHz to 50.125 MHz band segment?

Select	Answer
A	Only digital contacts
B	Only contacts with stations not within the 48 contiguous states
C	Only contacts with other stations within the 48 contiguous states
D	Only SSTV contacts

10. - G2C06

What does the term “zero beat” mean in CW operation?

Select	Answer
A	Operating split to avoid interference on frequency
B	Matching the transmit frequency to the frequency of a received signal
C	Matching the speed of the transmitting station
D	Sending without error

11. - G2D01

What is the Volunteer Monitor Program?

Select	Answer
A	Amateur volunteers who conduct amateur licensing examinations
B	Amateur volunteers who use their station equipment to help civil defense organizations in times of emergency
C	Amateur volunteers who conduct frequency coordination for amateur VHF repeaters
D	Amateur volunteers who are formally enlisted to monitor the airwaves for rules violations

12. - G2E06

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

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

13. - G3A13

What does the A-index measure?

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

14. - G3B01

What is a characteristic of skywave signals arriving at your location by both short-path and long-path propagation?

Select	Answer
A	A slightly delayed echo might be heard
B	Signal strength increased by 3 dB
C	The signal might be cancelled causing severe attenuation
D	Periodic fading approximately every 10 seconds

15. - G3C03

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

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

16. - G4A11

Why should the ALC system be inactive when transmitting AFSK data signals?

Select	Answer
A	When using digital modes, too much ALC activity can cause the transmitter to overheat
B	The ALC action distorts the signal
C	ALC will invert the modulation of the AFSK mode
D	All these choices are correct

17. - G4B07

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

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

18. - G4C02

Which of the following could be a cause of interference covering a wide range of frequencies?

Select	Answer
A	Arcing at a poor electrical connection
B	Using a balun to feed an unbalanced antenna
C	Lack of rectification of the transmitter’s signal in power conductors
D	Not using a balun or line isolator to feed balanced antennas

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

20. - G4E09

What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?

Select	Answer
A	1.38 VDC
B	0.5 VDC
C	0.2 VDC
D	0.02 VDC

21. - G5A10

Which of the following devices can be used for impedance matching at radio frequencies?

Select	Answer
A	A length of transmission line
B	A transformer
C	A Pi-network
D	All these choices are correct

22. - G5B06

What is the PEP produced by 200 volts peak-to-peak across a 50-ohm dummy load?

Select	Answer
A	400 watts
B	353.5 watts
C	1.4 watts
D	100 watts

23. - G5C01

What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

Select	Answer
A	Capacitive coupling
B	Mutual capacitance
C	Displacement current coupling
D	Mutual inductance

24. - G6A02

What is an advantage of batteries with low internal resistance?

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

25. - G6B11

What is an SMA connector?

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

26. - G7A04

What is characteristic of a half-wave rectifier in a power supply?

Select	Answer
A	More current can be drawn from the half-wave rectifier
B	The output voltage is two times the peak input voltage
C	Only one diode is required
D	The ripple frequency is twice that of a full-wave rectifier

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	Add the RF input power to the DC output power
C	Divide the DC input power by the DC output power
D	Divide the RF output power by the DC input power

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. - G8A06

Which of the following is characteristic of QPSK31?

Select	Answer
A	It is sideband sensitive
B	Its bandwidth is approximately the same as BPSK31
C	Its encoding provides error correction
D	All these choices are correct

30. - G8B11

What combination of a mixer’s Local Oscillator (LO) and RF input frequencies is found in the output?

Select	Answer
A	The ratio
B	The arithmetic product
C	The average
D	The sum and difference

31. - G8C01

On what band do amateurs share channels with the unlicensed Wi-Fi service?

Select	Answer
A	2.4 GHz
B	902 MHz
C	10.7 GHz
D	432 MHz

32. - G9A05

How does the attenuation of coaxial cable change with increasing frequency?

Select	Answer
A	Attenuation follows Marconi’s Law of Attenuation
B	Attenuation increases
C	Attenuation is independent of frequency
D	Attenuation decreases

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

34. - G9C02

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

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

35. - G9D08

How does a “screwdriver” mobile antenna adjust its feed point impedance?

Select	Answer
A	By deploying a capacitance hat
B	By varying its body capacitance
C	By extending and retracting the whip
D	By varying the base loading inductance