Technician Practice Test T0 – Electrical, Tower and RF Safety
Electrical hazards, fuses and grounding, tower safety and RF exposure rules. Tap an answer to check it.
Score: 0 / 0 (15)
Question 1
Which of the following is a safety hazard of a 12-volt storage battery that lacks internal protection circuitry?
Shorting the terminals of a 12-volt battery can deliver huge current, causing burns, fire or even an explosion.
Question 2
What health hazard is posed by electrical current flowing through the body?
Current through the body can heat tissue, disrupt cell functions and cause involuntary muscle contractions.
Question 3
In the United States, what circuit does black wire insulation indicate in a three-wire 120 V AC cable?
In U.S. 120 V AC wiring, black insulation is the hot wire.
Question 4
What is the purpose of a fuse in an electrical circuit?
A fuse removes power when the current is too high (overload).
Question 5
Why should a 5-ampere fuse never be replaced with a 20-ampere fuse?
A 20 A fuse lets far too much current flow through wiring meant for 5 A, which can overheat and start a fire.
Question 6
What is a good way to guard against electrical shock at your station?
Use three-wire cords, connect equipment to a common safety ground and discharge high-voltage capacitors before working inside.
Question 7
Where should a lightning arrester be installed in a coaxial feed line?
Install lightning arresters on a grounded panel where the feed lines enter the building.
Question 8
Where should a fuse or circuit breaker be installed in a 120V AC power circuit?
A fuse or breaker goes in series with the hot conductor only.
Question 9
What should be done to all external ground rods or earth connections?
All external ground rods should be bonded together with heavy wire or strap.
Question 10
What hazard exists when rapidly charging or discharging an unprotected battery?
Charging or discharging an unprotected battery too fast can make it overheat or release gas.
Question 11
What hazard exists in a power supply immediately after turning it off?
Filter capacitors can keep a dangerous charge after the power supply is turned off.
Question 12
Which of the following precautions should be taken when measuring high voltages with a voltmeter?
Use a voltmeter and leads rated for the voltage you are measuring.
Question 13
Which of the following is good practice when installing ground wires on a tower for lightning protection?
Lightning ground connections should be short and direct.
Question 14
What is required when climbing an antenna tower?
Climbing a tower requires training, tie-off at all times and an approved climbing harness.
Question 15
Under what circumstances is it safe to climb a tower without a helper or observer?
Never climb a tower without a helper or observer.
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The questions are the official public Technician pool. The rules come from FCC Part 97. Always check these sources for the current rules.