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NEW General Class Exam Question Pool

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

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2015-G4A: Station Operation and set up

2015-G4A01: What is the purpose of the "notch filter" found on many HF transceivers?

To reduce interference from carriers in the receiver passband

To restrict the transmitter voice bandwidth

To eliminate receiver interference from impulse noise sources

To enhance the reception of a specific frequency on a crowded band

2015-G4A02: What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver?

It may be possible to reduce or eliminate interference from other signals

Interference from impulse noise will be eliminated

More stations can be accommodated within a given signal passband

Accidental out of band operation can be prevented

2015-G4A03: What is normally meant by operating a transceiver in "split" mode?

The transceiver is set to different transmit and receive frequencies

The radio is operating at half power

The transceiver is operating from an external power source

The transmitter is emitting an SSB signal, as opposed to DSB operation

2015-G4A04: What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?

A pronounced dip

A pronounced peak

No change will be observed

A slow, rhythmic oscillation

2015-G4A05: What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?

To reduce distortion due to excessive drive

To balance the transmitter audio frequency response

To reduce harmonic radiation

To increase overall efficiency

2015-G4A06: What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms?

Antenna coupler or antenna tuner

Balanced modulator

SWR Bridge

Q Multiplier

2015-G4A07: What condition can lead to permanent damage to a solid-state RF power amplifier?

Excessive drive power

Insufficient drive power

Low input SWR

Shorting the input signal to ground

2015-G4A08: What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?

Maximum power output without exceeding maximum allowable plate current

Minimum SWR on the antenna

Minimum plate current without exceeding maximum allowable grid current

Highest plate voltage while minimizing grid current

2015-G4A09: Why is a time delay sometimes included in a transmitter keying circuit?

To allow time for transmit-receive changeover operations to complete properly before RF output is allowed

To prevent stations from interfering with one another

To allow the transmitter power regulators to charge properly

To allow time for a warning signal to be sent to other stations

2015-G4A10: What is the purpose of an electronic keyer?

Automatic generation of strings of dots and dashes for CW operation

Automatic transmit/receive switching

VOX operation

Computer interface for PSK and RTTY operation

2015-G4A11: Which of the following is a use for the IF shift control on a receiver?

To avoid interference from stations very close to the receive frequency

To change frequency rapidly

To permit listening on a different frequency from that on which you are transmitting

To tune in stations that are slightly off frequency without changing your transmit frequency

2015-G4A12: Which of the following is a common use for the dual VFO feature on a transceiver?

To permit monitoring of two different frequencies

To allow transmitting on two frequencies at once

To permit full duplex operation, that is transmitting and receiving at the same time

To facilitate computer interface

2015-G4A13: What is one reason to use the attenuator function that is present on many HF transceivers?

To reduce signal overload due to strong incoming signals

To reduce the transmitter power when driving a linear amplifier

To reduce power consumption when operating from batteries

To slow down received CW signals for better copy

2015-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?

Improper action of ALC distorts the signal and can cause spurious emissions

ALC will invert the modulation of the AFSK mode

When using digital modes, too much ALC activity can cause the transmitter to overheat

All of these choices are correct

2015-G4A15: Which of the following can be a symptom of transmitted RF being picked up by an audio cable carrying AFSK data signals between a computer and a transceiver?

All of these choices are correct

The VOX circuit does not un-key the transmitter

The transmitter signal is distorted

Frequent connection timeouts

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2015-G3C: Ionospheric layers; critical angle and frequency; HF scatter; Near Vertical Incidence Sky-wave
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2015-G4B: Test and monitoring equipment; two-tone test
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