Maintenance And Troubleshooting Trivia Quiz!

64 Questions | Total Attempts: 194

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Electricity Quizzes & Trivia

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

      On the power and disconnnect 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 realy

    • 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. 

      Comrpessor, the indoor fan, and the defrost cycle

    • D. 

      Outdoor fan, the indoor fan, and auxiliary heat

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

      Pictoral and line diagrams

    • B. 

      Line and sectional diagrams

    • C. 

      Sectional and pictoral diagrams

    • D. 

      Sectional and enhanced diamgrams

  • 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 trouble 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, & W

    • B. 

      R, G, & Y

    • C. 

      V, B, & W

    • D. 

      V, B, & 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. 

      Fram mount

    • 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 anmeter

    • D. 

      A clamp-on meter

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

      Metal can

    • B. 

      Paper can

    • C. 

      Plastic can

    • D. 

      Bakelite iron can

  • 18. 
    A start capacitor on an eletric 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 would be
    • A. 

      8 to 12*F

    • B. 

      10 to 14*F

    • C. 

      12 to 16*F

    • D. 

      16 to 22*F