T0A - Safety
Technician Class
Power circuits and hazards: hazardous voltages, fuses and circuit breakers, grounding, electrical code compliance; Lightning protection; Battery safety
12 questions
Which of the following is a safety hazard of a 12-volt storage battery?
What health hazard is presented by electrical current flowing through the body?
In the United States, what circuit does black wire insulation indicate in a three-wire 120 V cable?
What is the purpose of a fuse in an electrical circuit?
Why should a 5-ampere fuse never be replaced with a 20-ampere fuse?
What is a good way to guard against electrical shock at your station?
Where should a lightning arrester be installed in a coaxial feed line?
Where should a fuse or circuit breaker be installed in a 120V AC power circuit?
What should be done to all external ground rods or earth connections?
What hazard is caused by charging or discharging a battery too quickly?
What hazard exists in a power supply immediately after turning it off?
Which of the following precautions should be taken when measuring high voltages with a voltmeter?