Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?

1. A Only the hot wires
2. B Only the neutral wire
3. C Only the ground wire
4. D All wires

According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?

1. A AWG number 20
2. B AWG number 16
3. C AWG number 12
4. D AWG number 8

Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?

1. A 30 amperes
2. B 25 amperes
3. C 20 amperes
4. D 15 amperes

Where should the station's lightning protection ground system be located?

1. A As close to the station equipment as possible
2. B Outside the building
3. C Next to the closest power pole
4. D Parallel to the water supply line

Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?

1. A Current flowing from one or more of the hot wires to the neutral wire
2. B Current flowing from one or more of the hot wires directly to ground
3. C Overvoltage on the hot wires
4. D All these choices are correct

Which of the following is covered by the National Electrical Code?

1. A Acceptable bandwidth limits
2. B Acceptable modulation limits
3. C Electrical safety of the station
4. D RF exposure limits of the human body

Which of these choices should be observed when climbing a tower using a safety harness?

1. A Always hold on to the tower with one hand
2. B Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life
3. C Ensure that all heavy tools are securely fastened to the harness
4. D All these choices are correct

What should be done before climbing a tower that supports electrically powered devices?

1. A Notify the electric company that a person will be working on the tower
2. B Make sure all circuits that supply power to the tower are locked out and tagged
3. C Unground the base of the tower
4. D All these choices are correct

Which of the following is true of an emergency generator installation?

1. A The generator should be operated in a well-ventilated area
2. B The generator must be insulated from ground
3. C Fuel should be stored near the generator for rapid refueling in case of an emergency
4. D All these choices are correct

Which of the following is a danger from lead-tin solder?

1. A Lead can contaminate food if hands are not washed carefully after handling the solder
2. B High voltages can cause lead-tin solder to disintegrate suddenly
3. C Tin in the solder can "cold flow," causing shorts in the circuit
4. D RF energy can convert the lead into a poisonous gas

Which of the following is required for lightning protection ground rods?

1. A They must be bonded to all buried water and gas lines
2. B Bends in ground wires must be made as close as possible to a right angle
3. C Lightning grounds must be connected to all ungrounded wiring
4. D They must be bonded together with all other grounds

What is the purpose of a power supply interlock?

1. A To prevent unauthorized changes to the circuit that would void the manufacturer's warranty
2. B To shut down the unit if it becomes too hot
3. C To ensure that dangerous voltages are removed if the cabinet is opened
4. D To shut off the power supply if too much voltage is produced

Where should lightning arrestors be located?

1. A Where the feed lines enter the building
2. B On the antenna, opposite the feed point
3. C In series with each ground lead
4. D At the closest power pole ground electrode