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Technician Class Exam Question Pool

effective 7/01/2014 thru 6/30/2018

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Topic T4: Amateur Radio Practices


T4A-2014: Station setup: connecting microphones; reducing unwanted emissions; power source; connecting a computer; RF grounding; connecting digital equipment; connecting an SWR meter

T4A01-2014: Which of the following is true concerning the microphone connectors on amateur transceivers?

Some connectors include push-to-talk and voltages for powering the microphone

All transceivers use the same microphone connector type

All transceivers using the same connector type are wired identically

Un-keyed connectors allow any microphone to be connected



T4A02-2014: How might a computer be used as part of an amateur radio station?

All of these choices are correct

For logging contacts and contact information

For sending and/or receiving CW

For generating and decoding digital signals



T4A03-2014: Which is a good reason to use a regulated power supply for communications equipment?

It prevents voltage fluctuations from reaching sensitive circuits

A regulated power supply has FCC approval

A fuse or circuit breaker regulates the power

Power consumption is independent of load



T4A04-2014: Where must a filter be installed to reduce harmonic emissions from your station?

Between the transmitter and the antenna

Between the receiver and the transmitter

At the station power supply

At the microphone



T4A05-2014: Where should an in-line SWR meter be connected to monitor the standing wave ratio of the station antenna system?

In series with the feed line, between the transmitter and antenna

In series with the station's ground

In parallel with the push-to-talk line and the antenna

In series with the power supply cable, as close as possible to the radio



T4A06-2014: Which of the following would be connected between a transceiver and computer in a packet radio station?

Terminal node controller

Transmatch

Mixer

Antenna



T4A07-2014: How is a computer’s sound card used when conducting digital communications using a computer?

The sound card provides audio to the microphone input and converts received audio to digital form

The sound card communicates between the computer CPU and the video display

The sound card records the audio frequency for video display

All of these choices are correct



T4A08-2014: Which type of conductor is best to use for RF grounding?

Flat strap

Round stranded wire

Round copper-clad steel wire

Twisted-pair cable



T4A09-2014: Which of the following could you use to cure distorted audio caused by RF current flowing on the shield of a microphone cable?

Ferrite choke

Band-pass filter

Low-pass filter

Preamplifier



T4A10-2014: What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio?

The alternator

The ignition system

The electric fuel pump

Anti-lock braking system controllers



T4A11-2014: Where should the negative return connection of a mobile transceiver's power cable be connected?

At the battery or engine block ground strap

At the antenna mount

To any metal part of the vehicle

Through the transceiver’s mounting bracket



T4A12-2014: What could be happening if another operator reports a variable high-pitched whine on the audio from your mobile transmitter?

Noise on the vehicle’s electrical system is being transmitted along with your speech audio

Your microphone is picking up noise from an open window

You have the volume on your receiver set too high

You need to adjust your squelch control






T4B-2014: Operating controls: tuning; use of filters; squelch function; AGC; repeater offset; memory channels

T4B01-2014: What may happen if a transmitter is operated with the microphone gain set too high?

The output signal might become distorted

The output power might be too high

The frequency might vary

The SWR might increase



T4B02-2014: Which of the following can be used to enter the operating frequency on a modern transceiver?

The keypad or VFO knob

The CTCSS or DTMF encoder

The Automatic Frequency Control

All of these choices are correct



T4B03-2014: What is the purpose of the squelch control on a transceiver?

To mute receiver output noise when no signal is being received

To set the highest level of volume desired

To set the transmitter power level

To adjust the automatic gain control



T4B04-2014: What is a way to enable quick access to a favorite frequency on your transceiver?

Store the frequency in a memory channel

Enable the CTCSS tones

Disable the CTCSS tones

Use the scan mode to select the desired frequency



T4B05-2014: Which of the following would reduce ignition interference to a receiver?

Turn on the noise blanker

Change frequency slightly

Decrease the squelch setting

Use the RIT control



T4B06-2014: Which of the following controls could be used if the voice pitch of a single-sideband signal seems too high or low?

The receiver RIT or clarifier

The AGC or limiter

The bandwidth selection

The tone squelch



T4B07-2014: What does the term “RIT” mean?

Receiver Incremental Tuning

Receiver Input Tone

Rectifier Inverter Test

Remote Input Transmitter



T4B08-2014: What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?

Permits noise or interference reduction by selecting a bandwidth matching the mode

Permits monitoring several modes at once

Increases the number of frequencies that can be stored in memory

Increases the amount of offset between receive and transmit frequencies



T4B09-2014: Which of the following is an appropriate receive filter bandwidth to select in order to minimize noise and interference for SSB reception?

2400 Hz

500 Hz

1000 Hz

5000 Hz



T4B10-2014: Which of the following is an appropriate receive filter bandwidth to select in order to minimize noise and interference for CW reception?

500 Hz

1000 Hz

2400 Hz

5000 Hz



T4B11-2014: Which of the following describes the common meaning of the term "repeater offset"?

The difference between the repeater’s transmit and receive frequencies

The distance between the repeater’s transmit and receive antennas

The time delay before the repeater timer resets

Matching the antenna impedance to the feed line impedance



T4B12-2014: What is the function of automatic gain control or AGC?

To keep received audio relatively constant

To protect an antenna from lightning

To eliminate RF on the station cabling

An asymmetric goniometer control used for antenna matching





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