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T0A - AC power circuits
Terms in this set (13)
Which is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
How does current flowing through the body cause a health hazard?
By heating tissue & Disrupting the electrical functions of cells & Causing involuntary muscle contractions
What is connected to the green wire in a 3-wire electrical AC plug?
What is the purpose of a fuse in an electrical circuit?
To interrupt power in case of an overload
Why is it unwise to install a 20-amp fuse in the place of a 5-amp fuse?
Excessive current could cause a fire
What is a good way to guard against electrical shock at your station?
Use 3-wire cords & plugs for all AC equip. & Connect all AC station equip to a common safety ground & Use a circuit protected by a ground-fault interrupter
Which of these precautions should be taken when installing devices for lightning protection in a coax cable feedline?
Ground all of the protectors to a common plate which is in turn connected to an external ground
What is one way to recharge a 12-volt lead-acid battery if the commercial power is out?
Connect the battery to a car's battery & run the engine
What kind of hazard is presented by a conventional 12-volt storage battery?
Explosive gas can collect if not properly vented
What can happen if a lead-acid storage battery is charged or discharged too quickly?
The battery could overheat & give off flammable gas or explode
Which of the following is good practice when installing ground wires on a tower for lightning protection?
Ensure that connections are short & direct
What kind of hazard might exist in a power supply when it is turned off & disconnected?
You might get a shock from stored charge in large capacitors
What safety equip. should always be included in home-built equipment that is powered from 120V AC circuits?
A fuse or circuit breaker in series with the AC "hot" conductor
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