Online courses for the ham radio license exams. HamTestOnline - online courses for the ham radio exams
 

General Class Exam Question Pool

effective 7/01/2011 thru 6/30/2015

Show:
    Unseen questions
    Weak questions
    Review questions
    Learned questions
    Incorrect answer choices  
   

G4C-2011: Interference with consumer electronics; grounding; DSP

G4C01-2011: 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



G4C02-2011: 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

The use of horizontal rather than vertical antennas



G4C03-2011: 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



G4C04-2011: 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



G4C05-2011: 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



G4C06-2011: 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



G4C07-2011: 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



G4C08-2011: Which of the following would reduce RF interference caused by common-mode current on an audio cable?

Placing a ferrite bead around the cable

Adding series capacitors to the conductors

Adding shunt inductors to the conductors

Adding an additional insulating jacket to the cable



G4C09-2011: 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



G4C10-2011: 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



G4C11-2011: Which of the following is one use for a Digital Signal Processor in an amateur station?

To remove noise from received signals

To provide adequate grounding

To increase antenna gain

To increase antenna bandwidth



G4C12-2011: Which of the following is an advantage of a receiver Digital Signal Processor 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



G4C13-2011: Which of the following can perform automatic notching of interfering carriers?

A Digital Signal Processor (DSP) filter

Band-pass tuning

Balanced mixing

A noise limiter





Color key:
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer
Previous group:
G4B-2011: Test and monitoring equipment; two-tone test
Back to index:
General Class Exam Question Pool
Next group:
G4D-2011: Speech processors; S meters; sideband operation near band edges
Home     What is ham radio?     Which exam to take?     Study tips     Where to take the exam?     Frequently Asked Questions (FAQ)     How to     How much math?     Trouble with practice exams     Feedback     Prices     Ham It Forward     Free Extra course for active volunteer examiners     Refund policy     Terms and conditions     Bumper sticker     Advertise with us     The Ham band     Rate us     Question pools     Course structure     Survivalists     Documents     facebook     Google+     Contact us     Christina's story     TestOnline     Links
A TestOnline website.  Copyright © 2001-2013, HamTestOnline.  All rights reserved.