Online courses for the ham radio license exams.

Technician Class Exam Question Pool

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

    Unseen questions
    Weak questions
    Review questions
    Learned questions
    Incorrect answer choices  

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 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



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


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

Color key:
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer
Previous group:
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
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Technician Class Exam Question Pool
Next group:
T7D-2014: Basic repair and testing: soldering; using basic test instruments; connecting a voltmeter, ammeter, or ohmmeter
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