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. - G0A04

What does “time averaging” mean when evaluating RF radiation exposure?

Select	Answer
A	The total RF exposure averaged over a certain period
B	The total time of the exposure
C	The average amount of power developed by the transmitter over a specific 24-hour period
D	The average time it takes RF radiation to have any long-term effect on the body

2. - G0B10

Which of the following is a danger from lead-tin solder?

Select	Answer
A	Tin in the solder can “cold flow,” causing shorts in the circuit
B	High voltages can cause lead-tin solder to disintegrate suddenly
C	RF energy can convert the lead into a poisonous gas
D	Lead can contaminate food if hands are not washed carefully after handling the solder

3. - G1A01

On which HF and/or MF amateur bands are there portions where General class licensees cannot transmit?

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

4. - G1B08

When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission?

Select	Answer
A	Only when the contact is with amateurs licensed by a country which is a member of the United Nations, or by a territory possessed by such a country
B	Only when the foreign country has a formal third-party agreement filed with the FCC
C	Only when the contact is with amateurs licensed by a country which is a member of the International Amateur Radio Union, or by a territory possessed by such a country
D	When the contact is with amateurs in any country except those whose administrations have notified the ITU that they object to such communications

5. - G1C06

What is the limit for transmitter power on the 1.8 MHz band?

Select	Answer
A	1000 watts PEP output
B	1200 watts PEP output
C	200 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	The person’s home citizenship must be in ITU region 2
C	The person must be a resident of the US for a minimum of 5 years
D	None of these choices is correct; a non-US citizen cannot be a Volunteer Examiner

7. - G1E02

When may a 10-meter repeater retransmit the 2-meter signal from a station that has a Technician class control operator?

Select	Answer
A	Only during an FCC-declared general state of communications emergency
B	Only if the station on 10-meters is operating under a Special Temporary Authorization allowing such retransmission
C	Only if the 10-meter repeater control operator holds at least a General class license
D	Under no circumstances

8. - G2A01

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

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

9. - G2B05

When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	2 kHz to 3 kHz
B	5 Hz to 50 Hz
C	Approximately 6 kHz
D	150 Hz to 500 Hz

10. - G2C01

Which of the following describes full break-in CW operation (QSK)?

Select	Answer
A	Breaking stations send the Morse code prosign “BK”
B	Transmitting stations can receive between code characters and elements
C	Automatic keyers, instead of hand keys, are used to send Morse code
D	An operator must activate a manual send/receive switch before and after every transmission

11. - G2D11

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

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

12. - G2E11

What is the primary purpose of an Amateur Radio Emergency Data Network (AREDN) mesh network?

Select	Answer
A	To provide real time propagation data by monitoring amateur radio transmissions worldwide
B	To provide DX spotting reports to aid contesters and DXers
C	To provide high-speed data services during an emergency or community event
D	To provide FM repeater coverage in remote areas

13. - G3A13

What does the A-index measure?

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

14. - G3B06

What usually happens to radio waves with frequencies below the LUF?

Select	Answer
A	They are attenuated before reaching the destination
B	They are refracted and trapped in the ionosphere to circle Earth
C	They pass through the ionosphere
D	They are refracted back to Earth

15. - G3C02

What is meant by the term “critical frequency” at a given incidence angle?

Select	Answer
A	The highest frequency which is refracted back to Earth
B	The lowest frequency which is refracted back to Earth
C	The frequency at which the signal-to-noise ratio is 6 dB
D	The frequency at which the signal-to-noise ratio approaches unity

16. - G4A07

What happens as a receiver’s noise reduction control level is increased?

Select	Answer
A	Received frequency may shift several kHz
B	CW signals may become severely attenuated
C	Received signals may become distorted
D	Received frequency may become unstable

17. - G4B03

Which of the following is the best instrument to use for checking the keying waveform of a CW transmitter?

Select	Answer
A	A sidetone monitor
B	A wavemeter
C	An oscilloscope
D	A field strength meter

18. - G4C11

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

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

19. - G4D02

How does a speech processor affect a single sideband phone signal?

Select	Answer
A	It increases average power
B	It reduces harmonic distortion
C	It reduces intermodulation distortion
D	It increases peak power

20. - G4E06

What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?

Select	Answer
A	Harmonic radiation may increase
B	Q of the antenna will be very low
C	Operating bandwidth may be very limited
D	Short antennas are more likely to cause distortion of transmitted signals

21. - G5A11

What letter is used to represent reactance?

Select	Answer
A	Z
B	B
C	X
D	Y

22. - G5B13

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

Select	Answer
A	530 watts
B	1060 watts
C	1500 watts
D	2120 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 improve the coupling between the primary and secondary
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. - G6A07

What are the operating points for a bipolar transistor used as a switch?

Select	Answer
A	Enhancement and depletion modes
B	Peak and valley current points
C	Saturation and cutoff
D	The active region (between cutoff and saturation)

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	Ferrites expel magnetic fields
C	By creating an impedance in the current’s path
D	It converts common-mode current to differential mode current

26. - G7A05

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

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

27. - G7B07

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

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

28. - G7C01

What circuit is used to select one of the sidebands from a balanced modulator?

Select	Answer
A	Carrier oscillator
B	Filter
C	RF amplifier
D	IF amplifier

29. - G8A09

What type of modulation is used by FT8?

Select	Answer
A	Amplitude compressed AM
B	Vestigial sideband
C	8-bit direct sequence spread spectrum
D	8-tone frequency shift keying

30. - G8B08

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

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

31. - G8C04

Which of the following describes Baudot code?

Select	Answer
A	A code using error detection and correction
B	A 7-bit code with start, stop, and parity bits
C	A code using SELCAL and LISTEN
D	A 5-bit code with additional start and stop bits

32. - G9A06

In what units is RF feed line loss usually expressed?

Select	Answer
A	Ohms per 1,000 feet
B	Ohms per 100 feet
C	Decibels per 1,000 feet
D	Decibels per 100 feet

33. - G9B02

Which of the following is a common way to adjust the feed point impedance of an elevated quarter-wave ground-plane vertical antenna to be approximately 50 ohms?

Select	Answer
A	Coil the radials
B	Slope the radials upward
C	Slope the radials downward
D	Lengthen the radials beyond one wavelength

34. - G9C11

What is a beta or hairpin match?

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

35. - G9D10

In which direction or directions does an electrically small loop (less than 1/10 wavelength in circumference) have nulls in its radiation pattern?

Select	Answer
A	Broadside and in the plane of the loop
B	Broadside to the loop
C	Electrically small loops are omnidirectional
D	In the plane of the loop