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. - G1A07

Which of the following frequencies is within the General Class portion of the 20-meter phone band?

Select	Answer
A	14405 kHz
B	14005 kHz
C	14105 kHz
D	14305 kHz

2. - G1B02

With which of the following conditions must beacon stations comply?

Select	Answer
A	The frequency must be posted on the Internet or published in a national periodical
B	The frequency must be coordinated with the National Beacon Organization
C	There must be no more than one beacon signal transmitting in the same band from the same station location
D	A beacon station may not use automatic control

3. - G1C01

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

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

4. - G1D02

What license examinations may you administer when you are an accredited VE holding a General Class operator license?

Select	Answer
A	General and Technician
B	Extra, General and Technician
C	Technician only
D	General only

5. - G1E03

What is required to conduct communications with a digital station operating under automatic control outside the automatic control band segments?

Select	Answer
A	The interrogating transmission must be made by another automatically controlled station
B	The station initiating the contact must be under local or remote control
C	The control operator of the interrogating station must hold an Extra Class license
D	No third party traffic maybe be transmitted

6. - G2A04

Which mode is most commonly used for voice communications on the 17-meter and 12-meter bands?

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

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	Check to see if the channel is assigned to another station
D	All of these choices are correct

8. - G2C03

What does it mean when a CW operator sends "KN" at the end of a transmission?

Select	Answer
A	Operating full break-in
B	Closing station now
C	Listening only for a specific station or stations
D	Listening for novice stations

9. - G2D09

What information is traditionally contained in a station log?

Select	Answer
A	All of these choices are correct
B	Band and/or frequency of the contact
C	Call sign of station contacted and the signal report given
D	Date and time of contact

10. - G2E11

What is indicated on a waterfall display by one or more vertical lines adjacent to a PSK31 signal?

Select	Answer
A	Insufficient modulation
B	Backscatter propagation
C	Overmodulation
D	Long Path propagation

11. - G3A13

What does the A-index indicate?

Select	Answer
A	The long term stability of the 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

12. - G3B02

Which of the following is a good indicator of the possibility of sky-wave propagation on the 6-meter band?

Select	Answer
A	Severe attenuation of signals on the 10-meter band
B	Long skip sky-wave propagation on the 10-meter band
C	Short skip sky-wave propagation on the 10-meter band
D	Long delayed echoes on the 10-meter band

13. - G3C12

Which ionospheric layer is the most absorbent of long skip signals during daylight hours on frequencies below 10 MHz?

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

14. - G4A04

What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?

Select	Answer
A	A pronounced peak
B	No change will be observed
C	A slow, rhythmic oscillation
D	A pronounced dip

15. - G4B08

Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?

Select	Answer
A	A multimeter
B	A field strength meter
C	A Q meter
D	An antenna noise bridge

16. - G4C08

Which of the following would reduce RF interference caused by common-mode current on an audio cable?

Select	Answer
A	Adding shunt inductors to the conductors
B	Adding series capacitors to the conductors
C	Placing a ferrite choke around the cable
D	Adding an additional insulating jacket to the cable

17. - G4D08

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

Select	Answer
A	7.175 to 7.178 MHz
B	7.1765 to 7.1795 MHz
C	7.178 to 7.184 MHz
D	7.178 to 7.181 MHz

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

19. - G5A08

Why is impedance matching important?

Select	Answer
A	To ensure that the resistance and reactance in the circuit are equal
B	So the load will draw minimum power from the source
C	So the source can deliver maximum power to the load
D	To ensure that there is less resistance than reactance in the circuit

20. - G5B10

What percentage of power loss would result from a transmission line loss of 1 dB?

Select	Answer
A	20.5 percent
B	10.9 percent
C	25.9 percent
D	12.2 percent

21. - G5C10

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

Select	Answer
A	3.3 henrys
B	30 millihenrys
C	3.3 millihenrys
D	0.30 henrys

22. - G6A17

Which of the following is a reason not to use wire-wound resistors in an RF circuit?

Select	Answer
A	The resistor's internal capacitance would detune the circuit
B	The resistor could overheat
C	The resistor's inductance could make circuit performance unpredictable
D	The resistor's tolerance value would not be adequate for such a circuit

23. - G6B09

Which of the following is a characteristic of a liquid crystal display?

Select	Answer
A	It requires ambient or back lighting
B	It offers a wide dynamic range
C	It has a wide viewing angle
D	All of these choices are correct

24. - G7A03

What is the peak-inverse-voltage across the rectifiers in a full-wave bridge power supply?

Select	Answer
A	One-quarter the normal output voltage of the power supply
B	Equal to the normal peak output voltage of the power supply
C	Double the normal peak output voltage of the power supply
D	Half the normal output voltage of the power supply

25. - G7B01

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

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

26. - G7C01

Which of the following is used to process signals from the balanced modulator then send them to the mixer in some single sideband phone transmitters?

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

27. - G8A06

What is one advantage of carrier suppression in a single sideband phone transmission versus full carrier amplitude modulation?

Select	Answer
A	Audio fidelity is improved
B	Available transmitter power can be used more effectively
C	Simpler receiving equipment can be used
D	Greater modulation percentage is obtainable with lower distortion

28. - G8B10

What is the relationship between transmitted symbol rate and bandwidth?

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

29. - G8C10

How does forward error correction (FEC) allow the receiver to correct errors in received data packets?

Select	Answer
A	By using a parity bit with each character
B	By using the varicode character set
C	By transmitting redundant information with the data
D	By controlling transmitter output power for optimum signal strength

30. - G9A07

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

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

31. - G9B11

What is the approximate length for a 1/2 wave dipole antenna cut for 3.550 MHz?

Select	Answer
A	84 feet
B	42 feet
C	131 feet
D	263 feet

32. - G9C07

What does "front-to-back ratio" mean in reference to a Yagi antenna?

Select	Answer
A	The ratio of forward gain to dipole gain
B	The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
C	The number of directors versus the number of reflectors
D	The relative position of the driven element with respect to the reflectors and directors

33. - G9D11

Which of the following is a disadvantage of multiband antennas?

Select	Answer
A	They must be used with an antenna tuner
B	They must be fed with open wire line
C	They present low impedance on all design frequencies
D	They have poor harmonic rejection

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

35. - G0B04

Which of the following is a primary reason for not placing a gasoline-fueled generator inside an occupied area?

Select	Answer
A	Danger of carbon monoxide poisoning
B	Lack of nitrogen for adequate combustion
C	Danger of engine over torque
D	Lack of oxygen for adequate combustion