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NEW General Class Exam Question Pool

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

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2015-G4C: Interference with consumer electronics; grounding; DSP

2015-G4C01: Which of the following might be useful in reducing RF interference to audio frequency devices?

Bypass capacitor

Bypass inductor

Forward-biased diode

Reverse-biased diode

2015-G4C02: Which of the following could be a cause of interference covering a wide range of frequencies?

Arcing at a poor electrical connection

Not using a balun or line isolator to feed balanced antennas

Lack of rectification of the transmitter's signal in power conductors

Using a balun to feed an unbalanced antenna

2015-G4C03: What sound is heard from an audio device or telephone if there is interference from a nearby single sideband phone transmitter?

Distorted speech

A steady hum whenever the transmitter is on the air

On-and-off humming or clicking

Clearly audible speech

2015-G4C04: What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?

On-and-off humming or clicking

A CW signal at a nearly pure audio frequency

A chirpy CW signal

Severely distorted audio

2015-G4C05: What might be the problem if you receive an RF burn when touching your equipment while transmitting on an HF band, assuming the equipment is connected to a ground rod?

The ground wire has high impedance on that frequency

Flat braid rather than round wire has been used for the ground wire

Insulated wire has been used for the ground wire

The ground rod is resonant

2015-G4C06: What effect can be caused by a resonant ground connection?

High RF voltages on the enclosures of station equipment

Overheating of ground straps

Corrosion of the ground rod

A ground loop

2015-G4C07: What is one good way to avoid unwanted effects of stray RF energy in an amateur station?

Connect all equipment grounds together

Install an RF filter in series with the ground wire

Use a ground loop for best conductivity

Install a few ferrite beads on the ground wire where it connects to your station

2015-G4C08: Which of the following would reduce RF interference caused by common-mode current on an audio cable?

Placing a ferrite choke around the cable

Adding series capacitors to the conductors

Adding shunt inductors to the conductors

Adding an additional insulating jacket to the cable

2015-G4C09: How can a ground loop be avoided?

Connect all ground conductors to a single point

Connect all ground conductors in series

Connect the AC neutral conductor to the ground wire

Avoid using lock washers and star washers when making ground connections

2015-G4C10: What could be a symptom of a ground loop somewhere in your station?

You receive reports of "hum" on your station's transmitted signal

The SWR reading for one or more antennas is suddenly very high

An item of station equipment starts to draw excessive amounts of current

You receive reports of harmonic interference from your station

2015-G4C11: Which of the following is a function of a digital signal processor?

To remove noise from received signals

To provide adequate grounding

To increase antenna gain

To increase antenna bandwidth

2015-G4C12: Which of the following is an advantage of a receiver DSP IF filter as compared to an analog filter?

A wide range of filter bandwidths and shapes can be created

Fewer digital components are required

Mixing products are greatly reduced

The DSP filter is much more effective at VHF frequencies

2015-G4C13: Which of the following can perform automatic notching of interfering carriers?

A Digital Signal Processor (DSP) filter

Bandpass tuning

Balanced mixing

A noise limiter

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2015-G4B: Test and monitoring equipment; two-tone test
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2015-G4D: Speech processors; S meters; sideband operation near band edges
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