3e0x1 EOC Set 2 Electrical Systems Apprentice

378 Questions | Total Attempts: 405

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Apprentice Quizzes & Trivia

Set 1-4 of 2nd set for EOC Test


Questions and Answers
  • 1. 
    The preferred Air Force base distribution system is
    • A. 

      3-phase, 4-wire

    • B. 

      Single-phase, 3-wire

  • 2. 
    A substation with one incoming transmission circuit and three outoging distribution circuits has (at least) how many lighting arresters?
    • A. 

      12

    • B. 

      4

  • 3. 
    Which item supplies control voltage to operate circuit Breakers?
    • A. 

      Current Transformers

    • B. 

      Batteries

  • 4. 
    What is the configuration of an induction-voltage regulator's primary and secondary windings?
    • A. 

      The primary is in series and the secondary is in shunt

    • B. 

      The primary is in shunt and the secondary is in series

  • 5. 
    In regards to the circuit, how are a step-voltage regulators's primary and secondary windings configured?
    • A. 

      Primary is in series and the secondary is in series

    • B. 

      Primary is in parallel and the secondary is in series

  • 6. 
    When can the secondary of a current transformer be opened?
    • A. 

      When the secondary is deenergized

    • B. 

      When the primary is deenergized

  • 7. 
    Which is not a major fuunction of an oil circuit breaker?
    • A. 

      To minimize damage to a system by opening the circuit when an overload occurs

    • B. 

      To stabalize current flow during an overload situation

  • 8. 
    What oil circuit breaker components supply amperage to the protective relays?
    • A. 

      Current transformers

    • B. 

      Terminal bushings

  • 9. 
    What percent of electrical system faults are temporary?
    • A. 

      95 percent

    • B. 

      25 percent

  • 10. 
    Of these devices, which does not interrupt a fault current?
    • A. 

      Oil circuit breaker

    • B. 

      Sectionalizer

  • 11. 
    Air-break switches can be used to break a circuit "under load" if they have
    • A. 

      Vacuum switches

    • B. 

      Arc horns

  • 12. 
    Why is the arc extinguisheed so quickly in a vacuum recloser?
    • A. 

      The oil absorbs the fault current

    • B. 

      There is very little oxygen to burn

  • 13. 
    The insulating quality of sulfur hexafluoride (SF6), at 0 PSI, is how much greater than dry air?
    • A. 

      6 1/2 times

    • B. 

      2 1/2 times

  • 14. 
    A high-voltage switch is connected to the distribution system that is to protect in
    • A. 

      Series

    • B. 

      Parallel

  • 15. 
    What is usually installed with an oil circuit breaker to allow for equipment maintenence, letting you keep the circuit in operation?
    • A. 

      Fused cutouts and a backup oil circuit recloser

    • B. 

      Knife blades and a normally open air-break switch

  • 16. 
    Oil breaker contacts that are discolore by excessive heat should be 
    • A. 

      Adjusted

    • B. 

      Replaced

  • 17. 
    Dielectrically check the oil in oil circuit breakers 
    • A. 

      Monthly

    • B. 

      Every 6 months

  • 18. 
    Which of theses acids mixed with water is an effective solution for cleaning insulators and bushings?
    • A. 

      Sulfuric

    • B. 

      Muriatic

  • 19. 
    What do you use to clean the arc interrupters of an air-break switch?
    • A. 

      Cloth or light sanding

    • B. 

      Lint free cloth or round file

  • 20. 
    Clean a modern air switch that has been closed for a long time by 
    • A. 

      Using a clean cloth and wire brush

    • B. 

      Opening and Closing the switch several times

  • 21. 
    Battery bank maintenence is normally done
    • A. 

      Every 6 months

    • B. 

      Monthly

  • 22. 
    What do we use to test a battery cell for its specific gravity?
    • A. 

      Hydrometer syringe

    • B. 

      Barometric gauge

  • 23. 
    What must you do if you add water to a battery in freezing temperatures?
    • A. 

      Mix the solution with a stainless steel rod

    • B. 

      Charge the battery

  • 24. 
    The dielectric test voltage for a realy that is rated at 600 volts is
    • A. 

      1,500 volts

    • B. 

      2,200 volts

  • 25. 
    After a wiring change to a control device, check substaion circuits for
    • A. 

      Tightness of connections

    • B. 

      Proper operation

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