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. - G1A09

Which of the following frequencies is within the General Class portion of the 15-meter band?

Select	Answer
A	18155 kHz
B	14250 kHz
C	24900 kHz
D	21300 kHz

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	200 feet
B	100 feet
C	300 feet
D	50 feet

3. - G1C01

What is the maximum transmitting power an amateur station may use on 10.140 MHz?

Select	Answer
A	200 watts PEP output
B	2000 watts PEP output
C	1500 watts PEP output
D	1000 watts PEP output

4. - G1D10

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

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

5. - G1E11

Which of the following is the FCC term for an unattended digital station that transfers messages to and from the Internet?

Select	Answer
A	Locally controlled station
B	Fail-safe digital station
C	Robotically controlled station
D	Automatically controlled digital station

6. - G2A11

What does the expression "CQ DX" usually indicate?

Select	Answer
A	A distress call
B	The caller is looking for any station outside their own country
C	The caller is listening for a station in Germany
D	A general call for any station

7. - G2B07

Which of the following complies with good amateur practice when choosing a frequency on which to initiate a call?

Select	Answer
A	Identify your station by transmitting your call sign at least 3 times
B	Follow the voluntary band plan for the operating mode you intend to use
C	All of these choices are correct
D	Check to see if the channel is assigned to another station

8. - G2C07

When sending CW, what does a "C" mean when added to the RST report?

Select	Answer
A	Key clicks
B	Report was read from an S meter rather than estimated
C	Chirpy or unstable signal
D	100 percent copy

9. - G2D11

Which HF antenna would be the best to use for minimizing interference?

Select	Answer
A	A directional antenna
B	A quarter-wave vertical antenna
C	An omnidirectional antenna
D	An isotropic antenna

10. - G2E08

In what segment of the 20-meter band are most PSK31 operations commonly found?

Select	Answer
A	Below the RTTY segment, near 14.070 MHz
B	In the middle of the CW segment, near 14.100 MHz
C	At the top of the SSB phone segment, near 14.325 MHz
D	At the bottom of the slow-scan TV segment, near 14.230 MHz

11. - G3A13

What does the A-index indicate?

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

12. - G3B06

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

Select	Answer
A	They are bent and trapped in the ionosphere to circle the Earth
B	They pass through the ionosphere
C	They are completely absorbed by the ionosphere
D	They are bent back to the Earth

13. - G3C01

Which ionospheric layer is closest to the surface of the Earth?

Select	Answer
A	The F1 layer
B	The F2 layer
C	The E layer
D	The D layer

14. - G4A14

What is likely to happen if a transceiver's ALC system is not set properly when transmitting AFSK signals with the radio using single sideband mode?

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	Improper action of ALC distorts the signal and can cause spurious emissions
D	All of these choices are correct

15. - G4B01

What item of test equipment contains horizontal and vertical channel amplifiers?

Select	Answer
A	An oscilloscope
B	A signal generator
C	An ammeter
D	An ohmmeter

16. - G4C09

How can a ground loop be avoided?

Select	Answer
A	Connect the AC neutral conductor to the ground wire
B	Connect all ground conductors to a single point
C	Connect all ground conductors in series
D	Avoid using lock washers and star washers when making ground connections

17. - G4D02

Which of the following describes how a speech processor affects a transmitted single sideband phone signal?

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

18. - G4E03

Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?

Select	Answer
A	To the battery using heavy gauge wire
B	To the alternator or generator using resistor wire
C	To the alternator or generator using heavy gauge wire
D	To the battery using resistor wire

19. - G5A13

Which of the following devices can be used for impedance matching at radio frequencies?

Select	Answer
A	All of these choices are correct
B	A transformer
C	A length of transmission line
D	A Pi-network

20. - G5B14

What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output?

Select	Answer
A	8.75 watts
B	5000 watts
C	2500 watts
D	625 watts

21. - G5C06

What is the RMS voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC?

Select	Answer
A	2370 volts
B	540 volts
C	26.7 volts
D	5.9 volts

22. - G6A08

Why must the cases of some large power transistors be insulated from ground?

Select	Answer
A	To improve the power dissipation capability
B	To increase the beta of the transistor
C	To reduce stray capacitance
D	To avoid shorting the collector or drain voltage to ground

23. - G6B02

What is meant by the term MMIC?

Select	Answer
A	Multi Megabyte Integrated Circuit
B	Monolithic Microwave Integrated Circuit
C	Military Manufactured Integrated Circuit
D	Mode Modulated Integrated Circuit

24. - G7A09

Which symbol in figure G7-1 represents a field effect transistor?

Select	Answer
A	Symbol 4
B	Symbol 1
C	Symbol 2
D	Symbol 5

25. - G7B01

Complex digital circuitry can often be replaced by what type of integrated circuit?

Select	Answer
A	Window comparator
B	Microcontroller
C	Phase detector
D	Charge-coupled device

26. - G7C11

What is meant by the term "software defined radio" (SDR)?

Select	Answer
A	A radio that provides computer interface for automatic logging of band and frequency
B	A computer model that can simulate performance of a radio to aid in the design process
C	A radio in which most major signal processing functions are performed by software
D	A radio that uses crystal filters designed using software

27. - G8A04

What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?

Select	Answer
A	Pulse modulation
B	Multiplex modulation
C	Phase modulation
D	Amplitude modulation

28. - G8B10

What is the relationship between transmitted symbol rate and bandwidth?

Select	Answer
A	Bandwidth is always half the symbol rate
B	Higher symbol rates require wider bandwidth
C	Symbol rate and bandwidth are not related
D	Lower symbol rates require wider bandwidth

29. - G8C12

Which type of code is used for sending characters in a PSK31 signal?

Select	Answer
A	Volumetric
B	Viterbi
C	Varicode
D	Binary

30. - G9A09

What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 200 ohm impedance?

Select	Answer
A	2:1
B	1:4
C	1:2
D	4:1

31. - G9B02

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

Select	Answer
A	Shorten the radials
B	Lengthen the radials
C	Slope the radials upward
D	Slope the radials downward

32. - G9C05

How does increasing boom length and adding directors affect a Yagi antenna?

Select	Answer
A	Front to back ratio decreases
B	Front to side ratio decreases
C	Gain increases
D	Beamwidth increases

33. - G9D10

Which of the following describes a Beverage antenna?

Select	Answer
A	A helical antenna for space reception
B	A vertical antenna
C	A very long and low directional receiving antenna
D	A broad-band mobile antenna

34. - G0A02

Which of the following properties is important in estimating whether an RF signal exceeds the maximum permissible exposure (MPE)?

Select	Answer
A	All of these choices are correct
B	Its duty cycle
C	Its power density
D	Its frequency

35. - G0B01

Which wire or wires in a four-conductor connection should be attached to fuses or circuit breakers in a device operated from a 240 VAC single phase source?

Select	Answer
A	All wires
B	Only the ground wire
C	Only the neutral wire
D	Only the two wires carrying voltage

Figure G7-1