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T0AEdit

The T0A section covers AC power circuits; hazardous voltages, fuses and circuit breakers, grounding, lightning protection, battery safety, electrical code.
Click "Expand" to reveal the questions.

T0A01

Which is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
30 volts

T0A02

How does current flowing through the body cause a health hazard?
By heating tissue
It disrupts the electrical functions of cells
It causes involuntary muscle contractions
All of these choices are correct

T0A03

What is connected to the green wire in a three-wire electrical AC plug?
Safety ground

T0A04

What is the purpose of a fuse in an electrical circuit?
To interrupt power in case of overload

T0A05

Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
Excessive current could cause a fire

T0A06

What is a good way to guard against electrical shock at your station?
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
All of these choices are correct

T0A07

Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feedline?
Ground all of the protectors to a common plate which is in turn connected to an external ground

T0A08

What is one way to recharge a 12-volt lead-acid station battery if the commercial power is out?
Connect the battery to a car's battery and run the engine

T0A09

What kind of hazard is presented by a conventional 12-volt storage battery?
Explosive gas can collect if not properly vented

T0A10

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

T0A11

Which of the following is good practice when installing ground wires on a tower for lightning protection?
Ensure that connections are short and direct

T0A12

What kind of hazard might exist in a power supply when it is turned off and disconnected?
You might receive an electric shock from stored charge in large capacitors

T0A13

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

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