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Technician Class Exam Question Pool

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

    Unseen questions
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T0A-2014: Power circuits and hazards: hazardous voltages; fuses and circuit breakers; grounding; lightning protection; battery safety; electrical code compliance

T0A01-2014: Which of the following is a safety hazard of a 12-volt storage battery?

Shorting the terminals can cause burns, fire, or an explosion

Touching both terminals with the hands can cause electrical shock

RF emissions from the battery

All of these choices are correct

T0A02-2014: How does current flowing through the body cause a health hazard?

All of these choices are correct

By heating tissue

It disrupts the electrical functions of cells

It causes involuntary muscle contractions

T0A03-2014: What is connected to the green wire in a three-wire electrical AC plug?

Safety ground



The white wire

T0A04-2014: What is the purpose of a fuse in an electrical circuit?

To interrupt power in case of overload

To prevent power supply ripple from damaging a circuit

To limit current to prevent shocks

All of these choices are correct

T0A05-2014: Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?

Excessive current could cause a fire

The larger fuse would be likely to blow because it is rated for higher current

The power supply ripple would greatly increase

All of these choices are correct

T0A06-2014: What is a good way to guard against electrical shock at your station?

All of these choices are correct

Use three-wire cords and plugs for all AC powered equipment

Connect all AC powered station equipment to a common safety ground

Use a circuit protected by a ground-fault interrupter

T0A07-2014: Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feed line?

Ground all of the protectors to a common plate which is in turn connected to an external ground

Include a parallel bypass switch for each protector so that it can be switched out of the circuit when running high power

Include a series switch in the ground line of each protector to prevent RF overload from inadvertently damaging the protector

Keep the ground wires from each protector separate and connected to station ground

T0A08-2014: What safety equipment should always be included in home-built equipment that is powered from 120V AC power circuits?

A fuse or circuit breaker in series with the AC hot conductor

An AC voltmeter across the incoming power source

An inductor in series with the AC power source

A capacitor across the AC power source

T0A09-2014: What kind of hazard is presented by a conventional 12-volt storage battery?

Explosive gas can collect if not properly vented

It emits ozone which can be harmful to the atmosphere

Shock hazard due to high voltage

All of these choices are correct

T0A10-2014: What can happen if a lead-acid storage battery is charged or discharged too quickly?

The battery could overheat and give off flammable gas or explode

The voltage can become reversed

The memory effect will reduce the capacity of the battery

All of these choices are correct

T0A11-2014: What kind of hazard might exist in a power supply when it is turned off and disconnected?

You might receive an electric shock from the charged stored in large capacitors

Static electricity could damage the grounding system

Circulating currents inside the transformer might cause damage

The fuse might blow if you remove the cover

Color key:
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● = Incorrect answer
Previous group:
T9B-2014: Feed lines: types of feed lines; attenuation vs. frequency; SWR concepts; matching; weather protection; choosing RF connectors and feed lines
Back to index:
Technician Class Exam Question Pool
Next group:
T0B-2014: Antenna safety: tower safety; erecting an antenna support; overhead power lines; installing an antenna
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