3.9 KiB
3.9 KiB
G0B – Station safety: electrical shock, grounding, fusing, interlocks, and wiring; antenna and tower safety
- G0B01 (A)
Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?
- A. Only the hot wires
- B. Only the neutral wire
- C. Only the ground wire
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D. All wires
- G0B02 (C)
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?
- A. AWG number 20
- B. AWG number 16
- C. AWG number 12
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D. AWG number 8
- G0B03 (D)
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
- A. 30 amperes
- B. 25 amperes
- C. 20 amperes
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D. 15 amperes
- G0B04 (B)
Where should the station’s lightning protection ground system be located?
- A. As close to the station equipment as possible
- B. Outside the building
- C. Next to the closest power pole
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D. Parallel to the water supply line
- G0B05 (B)
Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?
- A. Current flowing from one or more of the hot wires to the neutral wire
- B. Current flowing from one or more of the hot wires directly to ground
- C. Overvoltage on the hot wires
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D. All these choices are correct
- G0B06 (C)
Which of the following is covered by the National Electrical Code?
- A. Acceptable bandwidth limits
- B. Acceptable modulation limits
- C. Electrical safety of the station
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D. RF exposure limits of the human body
- G0B07 (B)
Which of these choices should be observed when climbing a tower using a safety harness?
- A. Always hold on to the tower with one hand
- B. Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life
- C. Ensure that all heavy tools are securely fastened to the harness
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D. All these choices are correct
- G0B08 (B)
What should be done before climbing a tower that supports electrically powered devices?
- A. Notify the electric company that a person will be working on the tower
- B. Make sure all circuits that supply power to the tower are locked out and tagged
- C. Unground the base of the tower
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D. All these choices are correct
- G0B09 (A)
Which of the following is true of an emergency generator installation?
- A. The generator should be operated in a well-ventilated area
- B. The generator must be insulated from ground
- C. Fuel should be stored near the generator for rapid refueling in case of an emergency
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D. All these choices are correct
- G0B10 (A)
Which of the following is a danger from lead-tin solder?
- A. Lead can contaminate food if hands are not washed carefully after handling the solder
- B. High voltages can cause lead-tin solder to disintegrate suddenly
- C. Tin in the solder can “cold flow,” causing shorts in the circuit
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D. RF energy can convert the lead into a poisonous gas
- G0B11 (D)
Which of the following is required for lightning protection ground rods?
- A. They must be bonded to all buried water and gas lines
- B. Bends in ground wires must be made as close as possible to a right angle
- C. Lightning grounds must be connected to all ungrounded wiring
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D. They must be bonded together with all other grounds
- G0B12 (C)
What is the purpose of a power supply interlock?
- A. To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty
- B. To shut down the unit if it becomes too hot
- C. To ensure that dangerous voltages are removed if the cabinet is opened
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D. To shut off the power supply if too much voltage is produced
- G0B13 (A)
Where should lightning arrestors be located?
- A. Where the feed lines enter the building
- B. On the antenna, opposite the feed point
- C. In series with each ground lead
- D. At the closest power pole ground electrode