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	Use an antenna with a higher front-to-back ratio
B	All these choices are correct
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. - G0B02

According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?

Select	Answer
A	AWG number 16
B	AWG number 12
C	AWG number 8
D	AWG number 20

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 not cause harmful interference to primary users and must accept interference from primary users
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 record the call sign of the primary service station before operating on a frequency assigned to that station

4. - G1B05

Which of the following one-way transmissions are permitted?

Select	Answer
A	Unidentified test transmissions of less than 10 seconds in duration
B	All these choices are correct
C	Transmissions to assist with learning the International Morse code
D	Regular transmissions offering equipment for sale, if intended for amateur radio use

5. - G1C05

What is the limit for transmitter power on the 28 MHz band for a General Class control operator?

Select	Answer
A	1000 watts PEP output
B	2000 watts PEP output
C	100 watts PEP output
D	1500 watts PEP output

6. - G1D08

Which of the following criteria must be met for a non-US citizen to be an accredited Volunteer Examiner?

Select	Answer
A	The person must hold an FCC granted amateur radio license of General class or above
B	None of these choices is correct; a non-US citizen cannot be a Volunteer Examiner
C	The person’s home citizenship must be in ITU region 2
D	The person must be a resident of the US for a minimum of 5 years

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

8. - G2A11

Generally, who should respond to a station in the contiguous 48 states calling “CQ DX”?

Select	Answer
A	Any stations outside the lower 48 states
B	Only contest stations
C	Any caller is welcome to respond
D	Only stations in Germany

9. - G2B01

Which of the following is true concerning access to frequencies?

Select	Answer
A	Nets have priority
B	QSOs in progress have priority
C	Contest operations should yield to non-contest use of frequencies
D	Except during emergencies, no amateur station has priority access to any frequency

10. - G2C05

What is the best speed to use when answering a CQ in Morse code?

Select	Answer
A	At the standard calling speed of 5 wpm
B	The fastest speed at which you are comfortable copying, but no faster than the CQ
C	The fastest speed at which you are comfortable copying, but no slower than the CQ
D	At the standard calling speed of 10 wpm

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. - G2E04

Which of the following is good practice when choosing a transmitting frequency to answer a station calling CQ using FT8?

Select	Answer
A	Always call on the station’s frequency
B	Find a clear frequency during the alternate time slot to the calling station
C	Find a clear frequency during the same time slot as the calling station
D	Call on any frequency in the waterfall except the station’s frequency

13. - G3A08

How can a geomagnetic storm affect HF propagation?

Select	Answer
A	Degrade ground wave propagation
B	Improve high-latitude HF propagation
C	Degrade high-latitude HF propagation
D	Improve ground wave propagation

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. - G3C07

What makes HF scatter signals often sound distorted?

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

16. - G4A05

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

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

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 audio signals of the same frequency shifted 90 degrees
C	Two swept frequency tones
D	Two non-harmonically related audio signals

18. - G4C11

What technique helps to minimize RF “hot spots” in an amateur station?

Select	Answer
A	Placing low-pass filters on all feed lines
B	Bonding all equipment enclosures together
C	Building all equipment in a metal enclosure
D	Using surge suppressor power outlets

19. - G4D04

What does an S meter measure?

Select	Answer
A	Transmitter power output
B	Impedance
C	Carrier suppression
D	Received signal strength

20. - G4E02

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

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

21. - G5A09

What unit is used to measure reactance?

Select	Answer
A	Farad
B	Ampere
C	Ohm
D	Siemens

22. - G5B03

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

Select	Answer
A	400 watts
B	0.5 watts
C	200 watts
D	3200 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 accommodate the higher current of the primary
B	To prevent parasitic oscillations due to resistive losses in the primary
C	To improve the coupling between the primary and secondary
D	To ensure that the volume of the primary winding is equal to the volume of the secondary winding

24. - G6A12

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

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

25. - G6B10

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

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

26. - G7A05

What portion of the AC cycle is converted to DC by a half-wave rectifier?

Select	Answer
A	270 degrees
B	360 degrees
C	90 degrees
D	180 degrees

27. - G7B07

Which of the following are basic components of a sine wave oscillator?

Select	Answer
A	A frequency multiplier and a mixer
B	An amplifier and a divider
C	A filter and an amplifier operating in a feedback loop
D	A circulator and a filter operating in a feed-forward loop

28. - G7C04

How is a product detector used?

Select	Answer
A	Used in test gear to detect spurious mixing products
B	Used in transmitter to perform frequency multiplication
C	Used in a single sideband receiver to extract the modulated signal
D	Used in an FM receiver to filter out unwanted sidebands

29. - G8A07

Which of the following phone emissions uses the narrowest bandwidth?

Select	Answer
A	Frequency modulation
B	Phase modulation
C	Single sideband
D	Vestigial sideband

30. - G8B11

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

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

31. - G8C02

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

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

32. - G9A02

What is the relationship between high standing wave ratio (SWR) and transmission line loss?

Select	Answer
A	High SWR makes it difficult to measure transmission line loss
B	There is no relationship between transmission line loss and SWR
C	High SWR increases loss in a lossy transmission line
D	High SWR reduces the relative effect of transmission line loss

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

34. - G9C11

What is a beta or hairpin match?

Select	Answer
A	A 1/4 wavelength section of 75-ohm coax in series with the feed point of a Yagi to provide impedance matching
B	A series capacitor selected to cancel the inductive reactance of a folded dipole antenna
C	A shorted transmission line stub placed at the feed point of a Yagi antenna to provide impedance matching
D	A section of 300-ohm twin-lead transmission line used to match a folded dipole antenna

35. - G9D12

What is the common name of a dipole with a single central support?

Select	Answer
A	Inverted L
B	Lazy H
C	Sloper
D	Inverted V