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. - G0A11

What precaution should be taken if you install an indoor transmitting antenna?

Select	Answer
A	Locate the antenna close to your operating position to minimize feed-line radiation
B	Make sure the antenna is properly shielded
C	Make sure that MPE limits are not exceeded in occupied areas
D	Position the antenna along the edge of a wall to reduce parasitic radiation

2. - G0B12

What is the purpose of a power supply interlock?

Select	Answer
A	To ensure that dangerous voltages are removed if the cabinet is opened
B	To shut down the unit if it becomes too hot
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. - G1A02

On which of the following bands is phone operation prohibited?

Select	Answer
A	160 meters
B	30 meters
C	12 meters
D	17 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	When the contact is with amateurs in any country except those whose administrations have notified the ITU that they object to such communications
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 United Nations, or by a territory possessed by such a country
D	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

5. - G1C10

What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 10-meter band?

Select	Answer
A	1200 baud
B	300 baud
C	56 kilobaud
D	19.6 kilobaud

6. - G1D05

When operating a US station by remote control from outside the country, what license is required of the control operator?

Select	Answer
A	Only a license from the foreign country, as long as the call sign includes identification of portable operation in the US
B	A US operator/primary station license
C	A license from the foreign country and a special remote station permit from the FCC
D	Only an appropriate US operator/primary license and a special remote station permit from the FCC

7. - G1E09

Under what circumstances are messages that are sent via digital modes exempt from Part 97 third-party rules that apply to other modes of communication?

Select	Answer
A	Under no circumstances
B	When messages are not encrypted
C	When messages are encrypted
D	When under automatic control

8. - G2A01

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

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

9. - G2B10

Which of the following is good amateur practice for net management?

Select	Answer
A	Always use multiple sets of phonetics during check-in
B	Have a backup frequency in case of interference or poor conditions
C	Transmit the full net roster at the beginning of every session
D	All these choices are correct

10. - G2C11

What does the Q signal “QRV” mean?

Select	Answer
A	I am ready to receive
B	There is interference on the frequency
C	You are sending too fast
D	I am quitting for the day

11. - G2D06

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

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

12. - G2E09

How do you join a contact between two stations using the PACTOR protocol?

Select	Answer
A	Send broadcast packets containing your call sign while in MONITOR mode
B	Joining an existing contact is not possible, PACTOR connections are limited to two stations
C	Transmit a steady carrier until the PACTOR protocol times out and disconnects
D	Send a NAK code

13. - G3A11

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

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

14. - G3B05

How does the ionosphere affect radio waves with frequencies below the MUF and above the LUF?

Select	Answer
A	They are refracted and trapped in the ionosphere to circle Earth
B	They pass through the ionosphere
C	They are amplified by interaction with the ionosphere
D	They are refracted back to Earth

15. - G3C06

What is a characteristic of HF scatter?

Select	Answer
A	Scatter propagation occurs only at night
B	Signals have a fluttering sound
C	There are very large, sudden swings in signal strength
D	Phone signals have high intelligibility

16. - G4A05

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

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

17. - G4B03

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

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

18. - G4C04

What sound is heard from an audio device experiencing RF interference from a CW transmitter?

Select	Answer
A	A CW signal at a nearly pure audio frequency
B	Severely distorted audio
C	A chirpy CW signal
D	On-and-off humming or clicking

19. - G4D09

What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?

Select	Answer
A	14.347 MHz to 14.350 MHz
B	14.3455 MHz to 14.3485 MHz
C	14.347 MHz to 14.647 MHz
D	14.344 MHz to 14.347 MHz

20. - G4E02

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

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

21. - G5A02

What is reactance?

Select	Answer
A	Opposition to the flow of direct current caused by resistance
B	Reinforcement of the flow of alternating current caused by capacitance or inductance
C	Opposition to the flow of alternating current caused by capacitance or inductance
D	Reinforcement of the flow of direct current caused by resistance

22. - G5B08

What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?

Select	Answer
A	169.7 volts
B	84.8 volts
C	339.4 volts
D	240.0 volts

23. - G5C10

What is the inductance of three 10-millihenry inductors connected in parallel?

Select	Answer
A	0.30 henries
B	3.3 millihenries
C	3.3 henries
D	30 millihenries

24. - G6A04

Which of the following is characteristic of an electrolytic capacitor?

Select	Answer
A	Inexpensive RF capacitor
B	High capacitance for a given volume
C	Much less leakage than any other type
D	Tight tolerance

25. - G6B07

Which of the following describes a type N connector?

Select	Answer
A	A low noise figure VHF connector
B	A nickel plated version of the PL-259
C	A small bayonet connector used for data circuits
D	A moisture-resistant RF connector useful to 10 GHz

26. - G7A04

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

Select	Answer
A	The output voltage is two times the peak input voltage
B	More current can be drawn from the half-wave rectifier
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	Divide the DC input power by the DC output power
B	Add the RF input power to the DC output power
C	Divide the RF output power by the DC input power
D	Multiply the RF input power by the reciprocal of the RF output power

28. - G7C06

Which of the following is an advantage of a digital signal processing (DSP) filter compared to an analog filter?

Select	Answer
A	The DSP filter is much more effective at VHF frequencies
B	A wide range of filter bandwidths and shapes can be created
C	Mixing products are greatly reduced
D	Fewer digital components are required

29. - G8A12

What is QPSK modulation?

Select	Answer
A	Modulation in which digital data is transmitted using 0-, 90-, 180- and 270-degrees phase shift to represent pairs of bits
B	Modulation using quasi-parallel to serial conversion to reduce bandwidth
C	Modulation using quadra-pole sideband keying to generate spread spectrum signals
D	Modulation using Fast Fourier Transforms to generate frequencies at the first, second, third, and fourth harmonics of the carrier frequency to improve noise immunity

30. - G8B12

What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?

Select	Answer
A	Rolloff
B	Heterodyning
C	Detection
D	Intermodulation

31. - G8C14

Which of the following describes a waterfall display?

Select	Answer
A	Frequency is horizontal, signal strength is intensity, time is vertical
B	Frequency is vertical, signal strength is horizontal, time is intensity
C	Frequency is horizontal, signal strength is vertical, time is intensity
D	Frequency is vertical, signal strength is intensity, time is horizontal

32. - G9A07

What must be done to prevent standing waves on a feed line connected to an antenna?

Select	Answer
A	The feed line must be an odd number of electrical quarter wavelengths long
B	The antenna feed point must be at DC ground potential
C	The antenna feed point impedance must be matched to the characteristic impedance of the feed line
D	The feed line must be an even number of physical half wavelengths long

33. - G9B01

What is a characteristic of a random-wire HF antenna connected directly to the transmitter?

Select	Answer
A	It must be longer than 1 wavelength
B	Station equipment may carry significant RF current
C	It is more effective on the lower HF bands than on the higher bands
D	It produces only vertically polarized radiation

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 point of maximum current in a radiating antenna element
D	The direction of maximum radiated field strength from the antenna

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 between 1/10 and 1/4 wavelength above the ground
B	A vertical dipole placed at approximately 1/2 wavelength above the ground
C	A horizontal dipole placed at approximately 1/2 wavelength above the ground
D	A vertical antenna placed between 1/4 and 1/2 wavelength above the ground