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Technician Class Exam Question Pool

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

    Unseen questions
    Weak questions
    Review questions
    Learned questions
    Incorrect answer choices  

T9B-2014: Feed lines: types of feed lines; attenuation vs. frequency; SWR concepts; matching; weather protection; choosing RF connectors and feed lines

T9B01-2014: Why is it important to have a low SWR in an antenna system that uses coaxial cable feed line?

To allow the efficient transfer of power and reduce losses

To reduce television interference

To prolong antenna life

All of these choices are correct

T9B02-2014: What is the impedance of the most commonly used coaxial cable in typical amateur radio installations?

50 ohms

8 ohms

600 ohms

12 ohms

T9B03-2014: Why is coaxial cable used more often than any other feed line for amateur radio antenna systems?

It is easy to use and requires few special installation considerations

It has less loss than any other type of feed line

It can handle more power than any other type of feed line

It is less expensive than any other types of feed line

T9B04-2014: What does an antenna tuner do?

It matches the antenna system impedance to the transceiver's output impedance

It helps a receiver automatically tune in weak stations

It allows an antenna to be used on both transmit and receive

It automatically selects the proper antenna for the frequency band being used

T9B05-2014: What generally happens as the frequency of a signal passing through coaxial cable is increased?

The loss increases

The apparent SWR increases

The reflected power increases

The characteristic impedance increases

T9B06-2014: Which of the following connectors is most suitable for frequencies above 400 MHz?

A Type N connector

A UHF (PL-259/SO-239) connector

An RS-213 connector

A DB-25 connector

T9B07-2014: Which of the following is true of PL-259 type coax connectors?

They are commonly used at HF frequencies

They are preferred for microwave operation

They are water tight

They are a bayonet type connector

T9B08-2014: Why should coax connectors exposed to the weather be sealed against water intrusion?

To prevent an increase in feed line loss

To prevent interference to telephones

To keep the jacket from becoming loose

All of these choices are correct

T9B09-2014: What might cause erratic changes in SWR readings?

A loose connection in an antenna or a feed line

The transmitter is being modulated

The transmitter is being over-modulated

Interference from other stations is distorting your signal

T9B10-2014: What electrical difference exists between the smaller RG-58 and larger RG-8 coaxial cables?

RG-8 cable has less loss at a given frequency

There is no significant difference between the two types

RG-58 cable has less loss at a given frequency

RG-58 cable can handle higher power levels

T9B11-2014: Which of the following types of feed line has the lowest loss at VHF and UHF?

Air-insulated hard line

50-ohm flexible coax

Multi-conductor unbalanced cable

75-ohm flexible coax

Color key:
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer
Previous group:
T9A-2014: Antennas: vertical and horizontal polarization; concept of gain; common portable and mobile antennas; relationships between antenna length and frequency
Back to index:
Technician Class Exam Question Pool
Next group:
T0A-2014: Power circuits and hazards: hazardous voltages; fuses and circuit breakers; grounding; lightning protection; battery safety; electrical code compliance
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