3e151: Electrical Safety Hardest Trivia Questions! Quiz

64 Questions | Total Attempts: 297

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3e151: Electrical Safety Hardest Trivia Questions! Quiz

Are you a student taking up a course on electricity, how to connect it and use it effectively? Are you looking for a way to test out just how much you have understood so far? Then what better way than to take these 3e151: Electrical Safety Hardest Trivia Questions from your coursework? Do give them a try and keep testing yourself!


Questions and Answers
  • 1. 
    To safely check an electrical component for continuity or resistance, you would turn...
    • A. 

      On the power and disconnect at least one lead from the meter.

    • B. 

      Off the power and disconnect at least one lead from the meter.

    • C. 

      On the power and disconnect at least one lead from the component.

    • D. 

      Off the power and disconnect at least one lead from the component.

  • 2. 
    Which thermostat terminal passes power to the heat relay?
    • A. 

      R

    • B. 

      G

    • C. 

      W

    • D. 

      Y

  • 3. 
    Which thermostat terminal passes power to the indoor fan?
    • A. 

      R

    • B. 

      G

    • C. 

      W

    • D. 

      Y

  • 4. 
    Which fan circuit contacts must be closed to pass power to the fan motor?
    • A. 

      Fan relay

    • B. 

      Fan speed relay

    • C. 

      Evaporator relay

    • D. 

      Condenser relay

  • 5. 
    The three components that operate in the cooling mode are the...
    • A. 

      Compressor, the evaporator, and the outdoor fan.

    • B. 

      Indoor fan, the compressor, and the outdoor fan.

    • C. 

      Compressor, the indoor fan, and the defrost cycle.

    • D. 

      Outdoor fan, the indoor fan, and the auxiliary heat.

  • 6. 
    Most manufacturers illustrate the wiring in their equipment through the use of...
    • A. 

      Pictorial and line diagrams.

    • B. 

      Line and sectional diagrams.

    • C. 

      Sectional and pictorial diagrams.

    • D. 

      Sectional and enhanced diagrams.

  • 7. 
    You turn the indoor fan switch on a thermostat to the FAN ON position. When you do, the indoor fan motor does not come on. A possible cause of the problem is that there is...
    • A. 

      Control voltage.

    • B. 

      No control voltage.

    • C. 

      Too much control voltage.

    • D. 

      Not enough control voltage.

  • 8. 
    You use your volt-ohm-milliammeter to check a transformer. You find it has an open. In this situation, the probable cause is...
    • A. 

      No control voltage.

    • B. 

      A burned transformer.

    • C. 

      No power to the G terminal.

    • D. 

      A wire burned off the compressor.

  • 9. 
    On a trouble call, you determine that voltage is present from R to Y at the thermostat but no voltage is present at the condenser contactor. In this situation, you would suspect that the...
    • A. 

      R wire is broken.

    • B. 

      Contacts are broken.

    • C. 

      Y wire is broken.

    • D. 

      R and Y wires are both broken.

  • 10. 
    Which terminals would you use to determine why a thermostat does not pass power to the relays when a split-system air-conditioner unit is in the cooling mode?
    • A. 

      R, G, and W.

    • B. 

      R, G, and Y.

    • C. 

      V, B, and W.

    • D. 

      V, B, and Y.

  • 11. 
    After you have disabled a motor disconnect, you lock and tag the panel. After this, you should be sure to keep the only key.
    • A. 

      At the shop.

    • B. 

      On your person.

    • C. 

      With your crew leader.

    • D. 

      With your shop supervisor.

  • 12. 
    Mechanical motor problems normally occur at the...
    • A. 

      Pulley or belt drive.

    • B. 

      Bearings or the shaft.

    • C. 

      Pulleys or the shafts.

    • D. 

      End bells or ball bearings.

  • 13. 
    Most assemblies are held on the motor shaft by...
    • A. 

      Setscrews.

    • B. 

      Snap rings.

    • C. 

      Lock pins.

    • D. 

      O-rings.

  • 14. 
    If the motor drive pulley and the driven pulley are out of line, strain will be imposed on the...
    • A. 

      Starting circuit.

    • B. 

      Frame mounts.

    • C. 

      Motor air system.

    • D. 

      Shafts' drive mechanism.

  • 15. 
    A short circuit will occur in the windings of a motor when the conductors in the windings...
    • A. 

      Touch each other.

    • B. 

      Expand and contract.

    • C. 

      Pull apart from each other.

    • D. 

      Create a high amperage draw.

  • 16. 
    To check for a short circuit from a motor winding to ground, you would use...
    • A. 

      A voltmeter.

    • B. 

      An ohmmeter.

    • C. 

      An ammeter.

    • D. 

      A clamp-on ammeter.

  • 17. 
    A run capacitor on an electric motor is constructed as a...
    • A. 

      Metal can.

    • B. 

      Paper can.

    • C. 

      Plastic can.

    • D. 

      Bakelite iron can.

  • 18. 
    A start capacitor on an electric motor is constructed as a...
    • A. 

      Wet type.

    • B. 

      Dry type.

    • C. 

      Round type.

    • D. 

      Square type.

  • 19. 
    The motor problems that can occur inside a hermetic compressor are...
    • A. 

      A blown fuse, closed circuit, and grounded circuit.

    • B. 

      A closed circuit, short circuit, and a blown fuse.

    • C. 

      A grounded circuit, closed circuit, and a short circuit.

    • D. 

      An open circuit, short circuit, and grounded circuit.

  • 20. 
    A motor that has a bad run capacitor.
    • A. 

      Will not start.

    • B. 

      May run at normal speed.

    • C. 

      May run at a lower-than-normal speed.

    • D. 

      Will run at a higher-than-normal speed.

  • 21. 
    What type of electrical problems will a hermetic compressor have?
    • A. 

      Open circuit.

    • B. 

      Short circuit.

    • C. 

      Grounded circuit.

    • D. 

      All of the above.

  • 22. 
    A single-phase condition in a three-phase motor can be caused by...
    • A. 

      A defective start capacitor.

    • B. 

      A burned motor.

    • C. 

      A blown fuse.

    • D. 

      A closed circuit.

  • 23. 
    What is the possible cause when a motor will not start, hums, and trips on overload?
    • A. 

      Incorrect overload switch.

    • B. 

      Open disconnect switch.

    • C. 

      Incorrect power supply.

    • D. 

      Open fuse or breaker.

  • 24. 
    The temperature range of a refrigeration system depends upon the...
    • A. 

      Product being refrigerated.

    • B. 

      Condensing temperature.

    • C. 

      Size of the compressor.

    • D. 

      Ambient temperature.

  • 25. 
    To maintain 75 percent humidity in a refrigeration system with a temperature range of 25 to 45°F, the appropriate coil-to-air temperature difference would be...
    • A. 

      8 to 12°F

    • B. 

      10 to 14°F

    • C. 

      12 to 16°F

    • D. 

      16 to 22°F

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