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NEW General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

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2015-G4E: HF mobile radio installations; emergency and battery powered operation

2015-G4E01: What is the purpose of a capacitance hat on a mobile antenna?

To electrically lengthen a physically short antenna

To increase the power handling capacity of a whip antenna

To allow automatic band changing

To allow remote tuning

2015-G4E02: What is the purpose of a corona ball on a HF mobile antenna?

To reduce high voltage discharge from the tip of the antenna

To narrow the operating bandwidth of the antenna

To increase the "Q" of the antenna

To reduce the chance of damage if the antenna should strike an object

2015-G4E03: Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?

To the battery using heavy gauge wire

To the alternator or generator using heavy gauge wire

To the battery using resistor wire

To the alternator or generator using resistor wire

2015-G4E04: Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle’s auxiliary power socket?

The socket's wiring may be inadequate for the current drawn by the transceiver

The socket is not wired with an RF-shielded power cable

The DC polarity of the socket is reversed from the polarity of modern HF transceivers

Drawing more than 50 watts from this socket could cause the engine to overheat

2015-G4E05: Which of the following most limits the effectiveness of an HF mobile transceiver operating in the 75-meter band?

The antenna system

"Picket Fencing" signal variation

The wire gauge of the DC power line to the transceiver

FCC rules limiting mobile output power on the 75-meter band

2015-G4E06: What is one disadvantage of using a shortened mobile antenna as opposed to a full size antenna?

Operating bandwidth may be very limited

Short antennas are more likely to cause distortion of transmitted signals

Short antennas can only receive circularly polarized signals

Harmonic radiation may increase

2015-G4E07: Which of the following may cause interference to be heard in the receiver of an HF radio installed in a recent model vehicle?

All of these choices are correct

The battery charging system

The fuel delivery system

The vehicle control computer

2015-G4E08: What is the name of the process by which sunlight is changed directly into electricity?

Photovoltaic conversion

Photon emission


Photon decomposition

2015-G4E09: What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?

0.5 VDC

0.02 VDC

0.2 VDC

1.38 VDC

2015-G4E10: What is the reason that a series diode is connected between a solar panel and a storage battery that is being charged by the panel?

The diode prevents self-discharge of the battery through the panel during times of low or no illumination

The diode serves to regulate the charging voltage to prevent overcharge

The diode limits the current flowing from the panel to a safe value

The diode greatly increases the efficiency during times of high illumination

2015-G4E11: Which of the following is a disadvantage of using wind as the primary source of power for an emergency station?

A large energy storage system is needed to supply power when the wind is not blowing

The conversion efficiency from mechanical energy to electrical energy is less than 2 percent

The voltage and current ratings of such systems are not compatible with amateur equipment

All of these choices are correct

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2015-G4D: Speech processors; S meters; sideband operation near band edges
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2015-G5A: Reactance; inductance; capacitance; impedance; impedance matching
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