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	Low duty cycle transmitters are exempt from RF exposure evaluation requirements
B	High duty cycle transmitters are exempt from RF exposure requirements
C	A higher duty cycle permits greater power levels to be transmitted
D	A lower duty cycle permits greater power levels to be transmitted

2. - G0B12

What is the purpose of a power supply interlock?

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

3. - G1A08

Which HF bands have segments exclusively allocated to Amateur Extra licensees?

Select	Answer
A	All HF bands
B	80 meters, 40 meters, 20 meters, and 15 meters
C	60 meters, 30 meters, 17 meters, and 12 meters
D	All HF bands except 160 meters and 10 meters

4. - G1B07

What are the restrictions on the use of abbreviations or procedural signals in the amateur service?

Select	Answer
A	They are limited to those expressly listed in Part 97 of the FCC rules
B	Only “Q” signals are permitted
C	They are not permitted
D	They may be used if they do not obscure the meaning of a message

5. - G1C07

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

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

6. - G1D04

Who must observe the administration of a Technician class license examination?

Select	Answer
A	At least two Volunteer Examiners of General class or higher
B	At least two Volunteer Examiners of Technician class or higher
C	At least three Volunteer Examiners of General class or higher
D	At least three Volunteer Examiners of Technician class

7. - G1E11

On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?

Select	Answer
A	Anywhere in the 6-meter or shorter wavelength bands, and in limited segments of some of the HF bands
B	Only in the non-phone Extra Class segments of the bands
C	Anywhere in the non-phone segments of the 10-meter or shorter wavelength bands
D	On any band segment where digital operation is permitted

8. - G2A03

Which mode is most commonly used for SSB voice communications in the VHF and UHF bands?

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

9. - G2B03

What is good amateur practice if propagation changes during a contact creating interference from other stations using the frequency?

Select	Answer
A	Decrease power and continue to transmit
B	Attempt to resolve the interference problem with the other stations in a mutually acceptable manner
C	Switch to the opposite sideband
D	Advise the interfering stations that you are on the frequency and that you have priority

10. - G2C08

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

Select	Answer
A	KN
B	AR
C	SK
D	BK

11. - G2D11

Why are signal reports typically exchanged at the beginning of an HF contact?

Select	Answer
A	To allow each station to operate according to conditions
B	To be sure the contact will count for award programs
C	To allow each station to calibrate their frequency display
D	To follow standard radiogram structure

12. - G2E01

Which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter?

Select	Answer
A	USB
B	LSB
C	DSB
D	CW

13. - G3A11

How long does it take a coronal mass ejection to affect radio propagation on Earth?

Select	Answer
A	14 days
B	15 hours to several days
C	4 to 8 minutes
D	28 days

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	HF communications over the path are enhanced
C	Double-hop propagation along the path is more common
D	Propagation over the path on all HF frequencies is enhanced

15. - G3C07

What makes HF scatter signals often sound distorted?

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

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	ALC will invert the modulation of the AFSK mode
C	The ALC action distorts the signal
D	All these choices are correct

17. - G4B06

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

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

18. - G4C09

How can the effects of ground loops be minimized?

Select	Answer
A	Bond equipment enclosures together
B	Connect all ground conductors in series
C	Connect the AC neutral conductor to the ground wire
D	Avoid using lock washers and star washers when making ground connections

19. - G4D01

What is the purpose of a speech processor in a transceiver?

Select	Answer
A	Prevent distortion of voice signals
B	Increase transmitter bass response for more natural-sounding SSB signals
C	Increase the apparent loudness of transmitted voice signals
D	Decrease high-frequency voice output to prevent out-of-band operation

20. - G4E08

In what configuration are the individual cells in a solar panel connected together?

Select	Answer
A	Series-parallel
B	Shunt
C	Full-wave bridge
D	Bypass

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	All these choices are correct
C	A transformer
D	A Pi-network

22. - G5B13

What is the output PEP of an unmodulated carrier if the average power is 1060 watts?

Select	Answer
A	1060 watts
B	2120 watts
C	1500 watts
D	530 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 improve the coupling between the primary and secondary
B	To prevent parasitic oscillations due to resistive losses in the primary
C	To ensure that the volume of the primary winding is equal to the volume of the secondary winding
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	1.0 volts
C	0.3 volts
D	0.7 volts

25. - G6B03

Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?

Select	Answer
A	High power handling capability
B	Better suited for RF amplification
C	Better suited for power supply regulation
D	Low power consumption

26. - G7A12

Which symbol in Figure G7-1 represents a solid core transformer?

Select	Answer
A	Symbol 6
B	Symbol 1
C	Symbol 7
D	Symbol 4

27. - G7B06

What is a shift register?

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

28. - G7C13

What term specifies a filter’s maximum ability to reject signals outside its passband?

Select	Answer
A	Insertion loss
B	Rolloff
C	Ultimate rejection
D	Notch depth

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 using a transceiver’s computer data interface protocol to change frequencies
D	By keying an FM transmitter with a sub-audible tone

30. - G8B07

What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

Select	Answer
A	101.75 Hz
B	60 kHz
C	416.7 Hz
D	5 kHz

31. - G8C11

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

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

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 decreases
C	Attenuation is independent of frequency
D	Attenuation increases

33. - G9B04

What is the radiation pattern of a dipole antenna in free space in a plane containing the conductor?

Select	Answer
A	It is a figure-eight at right angles to the antenna
B	It has a pair of lobes on one side of the antenna and a single lobe on the other side
C	It is a circle (equal radiation in all directions)
D	It is a figure-eight off both ends of the antenna

34. - G9C08

What is meant by the “main lobe” of a directive antenna?

Select	Answer
A	The maximum voltage standing wave point on a radiating element
B	The magnitude of the maximum vertical angle of radiation
C	The direction of maximum radiated field strength from the antenna
D	The point of maximum current in a radiating antenna element

35. - G9D03

In which direction is the maximum radiation from a VHF/UHF “halo” antenna?

Select	Answer
A	Broadside to the plane of the halo
B	Omnidirectional in the plane of the halo
C	Opposite the feed point
D	On the same side as the feed point

Figure G7-1