US Amateur Radio - General (Element 3, 2015-2019) Practice Test

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US Amateur Radio - General (Element 3, 2015-2019) Practice Test

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1. - G1A05

Which of the following frequencies is in the General Class portion of the 40-meter band?

Select	Answer
A	7.250 MHz
B	40.500 MHz
C	7.500 MHz
D	40.200 MHz

2. - G1B01

What is the maximum height above ground to which an antenna structure may be erected without requiring notification to the FAA and registration with the FCC, provided it is not at or near a public use airport?

Select	Answer
A	100 feet
B	50 feet
C	300 feet
D	200 feet

3. - G1C09

What is the maximum symbol rate permitted for RTTY or data emission transmitted on the 1.25-meter and 70-centimeter bands?

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

4. - G1D10

What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?

Select	Answer
A	21 years
B	There is no age limit
C	18 years
D	12 years

5. - G1E12

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

6. - G2A09

Why do most amateur stations use lower sideband on the 160-meter, 75-meter and 40-meter bands?

Select	Answer
A	Because it is fully compatible with an AM detector
B	Lower sideband is more efficient than upper sideband at these frequencies
C	Lower sideband is the only sideband legal on these frequency bands
D	Current amateur practice is to use lower sideband on these frequency bands

7. - G2B05

What is the customary minimum frequency separation between SSB signals under normal conditions?

Select	Answer
A	Between 150 and 500 Hz
B	Approximately 6 kHz
C	Approximately 3 kHz
D	Approximately 10 kHz

8. - G2C10

What does the Q signal "QRN" mean?

Select	Answer
A	Zero beat my signal
B	Send more slowly
C	I am troubled by static
D	Stop sending

9. - G2D06

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

Select	Answer
A	Along the gray line
B	180 degrees from its short-path heading
C	Toward the rising Sun
D	Toward the north

10. - G2E01

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

Select	Answer
A	CW
B	LSB
C	USB
D	DSB

11. - G3A14

How are radio communications usually affected by the charged particles that reach the Earth from solar coronal holes?

Select	Answer
A	HF communications are improved
B	VHF/UHF ducting is disturbed
C	VHF/UHF ducting is improved
D	HF communications are disturbed

12. - G3B09

What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?

Select	Answer
A	1,200 miles
B	2,500 miles
C	180 miles
D	12,000 miles

13. - G3C08

Why are HF scatter signals in the skip zone usually weak?

Select	Answer
A	Propagations is through ducts in F region which absorb most of the energy
B	Only a small part of the signal energy is scattered into the skip zone
C	Propagation is through ground waves which absorb most of the signal energy
D	Signals are scattered from the magnetosphere which is not a good reflector

14. - G4A13

What is one reason to use the attenuator function that is present on many HF transceivers?

Select	Answer
A	To reduce power consumption when operating from batteries
B	To reduce the transmitter power when driving a linear amplifier
C	To slow down received CW signals for better copy
D	To reduce signal overload due to strong incoming signals

15. - G4B12

What problem can occur when making measurements on an antenna system with an antenna analyzer?

Select	Answer
A	Connecting the analyzer to an antenna can cause it to absorb harmonics
B	Strong signals from nearby transmitters can affect the accuracy of measurements
C	The analyzer can be damaged if measurements outside the ham bands are attempted
D	Permanent damage to the analyzer may occur if it is operated into a high SWR

16. - G4C06

What effect can be caused by a resonant ground connection?

Select	Answer
A	A ground loop
B	High RF voltages on the enclosures of station equipment
C	Overheating of ground straps
D	Corrosion of the ground rod

17. - G4D05

How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?

Select	Answer
A	It is 100 times more powerful
B	It is 20 times less powerful
C	It is 20 times more powerful
D	It is 10 times less powerful

18. - G4E04

Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle's auxiliary power socket?

Select	Answer
A	The DC polarity of the socket is reversed from the polarity of modern HF transceivers
B	The socket's wiring may be inadequate for the current drawn by the transceiver
C	The socket is not wired with an RF-shielded power cable
D	Drawing more than 50 watts from this socket could cause the engine to overheat

19. - G5A07

What happens when the impedance of an electrical load is equal to the output impedance of a power source, assuming both impedances are resistive?

Select	Answer
A	The electrical load is shorted
B	No current can flow through the circuit
C	The source delivers minimum power to the load
D	The source can deliver maximum power to the load

20. - G5B12

What would be the RMS voltage across a 50 ohm dummy load dissipating 1200 watts?

Select	Answer
A	245 volts
B	346 volts
C	173 volts
D	692 volts

21. - G5C03

Which of the following components should be added to an existing resistor to increase the resistance?

Select	Answer
A	A capacitor in series
B	A capacitor in parallel
C	A resistor in series
D	A resistor in parallel

22. - G6A05

What is the approximate junction threshold voltage of a conventional silicon diode?

Select	Answer
A	0.7 volts
B	1.0 volts
C	0.1 volt
D	0.3 volts

23. - G6B13

Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?

Select	Answer
A	Octal
B	DB-25
C	RJ-11
D	PL-259

24. - G7A06

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

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

25. - G7B10

Which of the following is a characteristic of a Class A amplifier?

Select	Answer
A	Low distortion
B	Low standby power
C	High Efficiency
D	No need for bias

26. - G7C08

What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?

Select	Answer
A	Phase inverter
B	Product detector
C	Discriminator
D	Mixer

27. - G8A10

What is meant by the term flat-topping when referring to a single sideband phone transmission?

Select	Answer
A	The transmitter's carrier is properly suppressed
B	Signal distortion caused by excessive drive
C	Signal distortion caused by insufficient collector current
D	The transmitter's automatic level control (ALC) is properly adjusted

28. - G8B05

What is the approximate bandwidth of a PACTOR3 signal at maximum data rate?

Select	Answer
A	500 Hz
B	2300 Hz
C	31.5 Hz
D	1800 Hz

29. - G8C06

What action results from a failure to exchange information due to excessive transmission attempts when using PACTOR or WINMOR?

Select	Answer
A	The connection is dropped
B	Encoding reverts to the default character set
C	Packets will be routed incorrectly
D	The checksum overflows

30. - G9A02

What are the typical characteristic impedances of coaxial cables used for antenna feed lines at amateur stations?

Select	Answer
A	25 and 30 ohms
B	500 and 750 ohms
C	80 and 100 ohms
D	50 and 75 ohms

31. - G9B12

What is the approximate length for a 1/4 wave vertical antenna cut for 28.5 MHz?

Select	Answer
A	8 feet
B	21 feet
C	16 feet
D	11 feet

32. - G9C18

What happens when the feed point of a quad antenna of any shape is moved from the midpoint of the top or bottom to the midpoint of either side?

Select	Answer
A	There is no change in polarization
B	The polarization of the radiated signal changes from vertical to horizontal
C	The radiated signal becomes circularly polarized
D	The polarization of the radiated signal changes from horizontal to vertical

33. - G9D01

What does the term NVIS mean as related to antennas?

Select	Answer
A	Non-Varying Indicated SWR
B	Non-Varying Impedance Smoothing
C	Nearly Vertical Inductance System
D	Near Vertical Incidence sky-wave

34. - G0A05

What must you do if an evaluation of your station shows RF energy radiated from your station exceeds permissible limits?

Select	Answer
A	Take action to prevent human exposure to the excessive RF fields
B	Secure written permission from your neighbors to operate above the controlled MPE limits
C	All of these choices are correct
D	File an Environmental Impact Statement (EIS-97) with the FCC

35. - G0B08

What should be done by any person preparing to climb a tower that supports electrically powered devices?

Select	Answer
A	Make sure all circuits that supply power to the tower are locked out and tagged
B	Unground the base of the tower
C	All of these choices are correct
D	Notify the electric company that a person will be working on the tower