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