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Technician Class Exam Question Pool

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

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Topic T7: Station Equipment


T7A-2014: Station equipment: receivers; transmitters; transceivers; modulation; transverters; low power and weak signal operation; transmit and receive amplifiers

T7A01-2014: Which term describes the ability of a receiver to detect the presence of a signal?

Sensitivity

Linearity

Selectivity

Total Harmonic Distortion



T7A02-2014: What is a transceiver?

A unit combining the functions of a transmitter and a receiver

A type of antenna switch

A component in a repeater which filters out unwanted interference

A type of antenna matching network



T7A03-2014: Which of the following is used to convert a radio signal from one frequency to another?

Mixer

Phase splitter

Inverter

Amplifier



T7A04-2014: Which term describes the ability of a receiver to discriminate between multiple signals?

Selectivity

Discrimination ratio

Sensitivity

Harmonic Distortion



T7A05-2014: What is the name of a circuit that generates a signal of a desired frequency?

Oscillator

Reactance modulator

Product detector

Low-pass filter



T7A06-2014: What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal?

Transverter

High-pass filter

Low-pass filter

Phase converter



T7A07-2014: What is meant by term “PTT”?

The push to talk function which switches between receive and transmit

Pre-transmission tuning to reduce transmitter harmonic emission

Precise tone transmissions used to limit repeater access to only certain signals

A primary transformer tuner use to match antennas



T7A08-2014: Which of the following describes combining speech with an RF carrier signal?

Modulation

Impedance matching

Oscillation

Low-pass filtering



T7A09-2014: Which of the following devices is most useful for VHF weak-signal communication?

A multi-mode VHF transceiver

A quarter-wave vertical antenna

An omni-directional antenna

A mobile VHF FM transceiver



T7A10-2014: What device increases the low-power output from a handheld transceiver?

An RF power amplifier

A voltage divider

An impedance network

All of these choices are correct



T7A11-2014: Where is an RF preamplifier installed?

Between the antenna and receiver

At the output of the transmitter's power amplifier

Between a transmitter and antenna tuner

At the receiver's audio output






T7B-2014: Common transmitter and receiver problems: symptoms of overload and overdrive; distortion; causes of interference; interference and consumer electronics; part 15 devices; over and under modulation; RF feedback; off frequency signals; fading and noise; problems with digital communications interfaces

T7B01-2014: What can you do if you are told your FM handheld or mobile transceiver is over-deviating?

Talk farther away from the microphone

Talk louder into the microphone

Let the transceiver cool off

Change to a higher power level



T7B02-2014: What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?

The receiver is unable to reject strong signals outside the AM or FM band

The microphone gain of the transmitter is turned up too high

The audio amplifier of the transmitter is overloaded

The deviation of an FM transmitter is set too low



T7B03-2014: Which of the following may be a cause of radio frequency interference?

All of these choices are correct

Fundamental overload

Harmonics

Spurious emissions



T7B04-2014: Which of the following is a way to reduce or eliminate interference by an amateur transmitter to a nearby telephone?

Put a RF filter on the telephone

Put a filter on the amateur transmitter

Reduce the microphone gain

Reduce the SWR on the transmitter transmission line



T7B05-2014: How can overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?

Block the amateur signal with a filter at the antenna input of the affected receiver

Block the interfering signal with a filter on the amateur transmitter

Switch the transmitter from FM to SSB

Switch the transmitter to a narrow-band mode



T7B06-2014: Which of the following actions should you take if a neighbor tells you that your station's transmissions are interfering with their radio or TV reception?

Make sure that your station is functioning properly and that it does not cause interference to your own radio or television when it is tuned to the same channel

Immediately turn off your transmitter and contact the nearest FCC office for assistance

Tell them that your license gives you the right to transmit and nothing can be done to reduce the interference

Install a harmonic doubler on the output of your transmitter and tune it until the interference is eliminated



T7B07-2014: Which of the following may be useful in correcting a radio frequency interference problem?

All of these choices are correct

Snap-on ferrite chokes

Low-pass and high-pass filters

Band-reject and band-pass filters



T7B08-2014: What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?

All of these choices are correct

Work with your neighbor to identify the offending device

Politely inform your neighbor about the rules that prohibit the use of devices which cause interference

Check your station and make sure it meets the standards of good amateur practice



T7B09-2014: What is a Part 15 device?

An unlicensed device that may emit low powered radio signals on frequencies used by a licensed service

A type of amateur radio that can legally be used in the citizen’s band

A device for long distance communications using special codes sanctioned by the International Amateur Radio Union

A type of test set used to determine whether a transmitter is in compliance with FCC regulation 91.15



T7B10-2014: What might be the problem if you receive a report that your audio signal through the repeater is distorted or unintelligible?

All of these choices are correct

Your transmitter may be slightly off frequency

Your batteries may be running low

You could be in a bad location



T7B11-2014: What is a symptom of RF feedback in a transmitter or transceiver?

Reports of garbled, distorted, or unintelligible transmissions

Excessive SWR at the antenna connection

The transmitter will not stay on the desired frequency

Frequent blowing of power supply fuses



T7B12-2014: What might be the first step to resolve cable TV interference from your ham radio transmission?

Be sure all TV coaxial connectors are installed properly

Add a low pass filter to the TV antenna input

Add a high pass filter to the TV antenna input

Add a preamplifier to the TV antenna input






T7C-2014: Antenna measurements and troubleshooting: measuring SWR; dummy loads; coaxial cables; feed line failure modes

T7C01-2014: What is the primary purpose of a dummy load?

To prevent the radiation of signals when making tests

To prevent over-modulation of your transmitter

To improve the radiation from your antenna

To improve the signal to noise ratio of your receiver



T7C02-2014: Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?

An antenna analyzer

A VTVM

A Q meter

A frequency counter



T7C03-2014: What, in general terms, is standing wave ratio (SWR)?

A measure of how well a load is matched to a transmission line

The ratio of high to low impedance in a feed line

The transmitter efficiency ratio

An indication of the quality of your station’s ground connection



T7C04-2014: What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?

1 to 1

2 to 1

1 to 3

10 to 1



T7C05-2014: What is the approximate SWR value above which the protection circuits in most solid-state transmitters begin to reduce transmitter power?

2 to 1

1 to 2

6 to 1

10 to 1



T7C06-2014: What does an SWR reading of 4:1 indicate?

Impedance mismatch

Loss of -4dB

Good impedance match

Gain of +4dB



T7C07-2014: What happens to power lost in a feed line?

It is converted into heat

It increases the SWR

It comes back into your transmitter and could cause damage

It can cause distortion of your signal



T7C08-2014: What instrument other than an SWR meter could you use to determine if a feed line and antenna are properly matched?

Directional wattmeter

Voltmeter

Ohmmeter

Iambic pentameter



T7C09-2014: Which of the following is the most common cause for failure of coaxial cables?

Moisture contamination

Gamma rays

The velocity factor exceeds 1.0

Overloading



T7C10-2014: Why should the outer jacket of coaxial cable be resistant to ultraviolet light?

Ultraviolet light can damage the jacket and allow water to enter the cable

Ultraviolet resistant jackets prevent harmonic radiation

Ultraviolet light can increase losses in the cable’s jacket

Ultraviolet and RF signals can mix together, causing interference



T7C11-2014: What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types?

It requires special techniques to prevent water absorption

It has more loss per foot

It cannot be used for VHF or UHF antennas

It cannot be used at below freezing temperatures



T7C12-2014: Which of the following is a common use of coaxial cable?

Carrying RF signals between a radio and antenna

Carrying dc power from a vehicle battery to a mobile radio

Securing masts, tubing, and other cylindrical objects on towers

Connecting data signals from a TNC to a computer



T7C13-2014: What does a dummy load consist of?

A non-inductive resistor and a heat sink

A high-gain amplifier and a TR switch

A low voltage power supply and a DC relay

A 50 ohm reactance used to terminate a transmission line






T7D-2014: Basic repair and testing: soldering; using basic test instruments; connecting a voltmeter, ammeter, or ohmmeter

T7D01-2014: Which instrument would you use to measure electric potential or electromotive force?

A voltmeter

An ammeter

A wavemeter

An ohmmeter



T7D02-2014: What is the correct way to connect a voltmeter to a circuit?

In parallel with the circuit

In series with the circuit

In quadrature with the circuit

In phase with the circuit



T7D03-2014: How is an ammeter usually connected to a circuit?

In series with the circuit

In parallel with the circuit

In quadrature with the circuit

In phase with the circuit



T7D04-2014: Which instrument is used to measure electric current?

An ammeter

An ohmmeter

A wavemeter

A voltmeter



T7D05-2014: What instrument is used to measure resistance?

An ohmmeter

An oscilloscope

A spectrum analyzer

A noise bridge



T7D06-2014: Which of the following might damage a multimeter?

Attempting to measure voltage when using the resistance setting

Measuring a voltage too small for the chosen scale

Leaving the meter in the milliamps position overnight

Not allowing it to warm up properly



T7D07-2014: Which of the following measurements are commonly made using a multimeter?

Voltage and resistance

SWR and RF power

Signal strength and noise

Impedance and reactance



T7D08-2014: Which of the following types of solder is best for radio and electronic use?

Rosin-core solder

Acid-core solder

Silver solder

Aluminum solder



T7D09-2014: What is the characteristic appearance of a cold solder joint?

A grainy or dull surface

Dark black spots

A bright or shiny surface

A greenish tint



T7D10-2014: What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?

The circuit contains a large capacitor

The ohmmeter is defective

The circuit contains a large inductor

The circuit is a relaxation oscillator



T7D11-2014: Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?

Ensure that the circuit is not powered

Ensure that the applied voltages are correct

Ensure that the circuit is grounded

Ensure that the circuit is operating at the correct frequency



T7D12-2014: Which of the following precautions should be taken when measuring high voltages with a voltmeter?

Ensure that the voltmeter and leads are rated for use at the voltages to be measured

Ensure that the voltmeter has very low impedance

Ensure that the circuit is grounded through the voltmeter

Ensure that the voltmeter is set to the correct frequency





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T6: Electrical Components
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