Substation Equipment & Overhead Systems

116 Questions | Total Attempts: 698

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Electricity Quizzes & Trivia

Volume one covers the connections and power factors.


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

      34.5 kV

    • B. 

      69 kV

    • C. 

      3-phase,4wire

    • D. 

      Single-phase, 3-wire

  • 2. 
    Which of these equipment items is designed to open a circuit automatically under load and then restore the service quickly once the fault has cleared?
    • A. 

      Fused cutout

    • B. 

      Sectionalizer

    • C. 

      Pole-top switch

    • D. 

      Recloser

  • 3. 
    Which of the following items supply control voltage to operate circuit breakers?
    • A. 

      Batteries

    • B. 

      Signal generators

    • C. 

      Current transformers

    • D. 

      Distribution transformers

  • 4. 
    What are the minimum requirements for a substation fence?
    • A. 

      Two strands of barbed wire above a 6-foot-high fence

    • B. 

      Two strands of barbed wire above a 7-foot-high fence

    • C. 

      Three strands of barbed wire above a 6-foot-high fence

    • D. 

      Three strands of barbed wire above a 7-foot-high fence

  • 5. 
    How many feet past the substation fence must the perimeter ground wire extend?
    • A. 

      2

    • B. 

      5

    • C. 

      8

    • D. 

      10

  • 6. 
    What item in an oil circuit breaker suppresses an arc?
    • A. 

      Oil

    • B. 

      Dashpot

    • C. 

      Protective relay

    • D. 

      Current transformer

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

      To provide a means of switching under load

    • B. 

      To stabilize current flow during an overload situation

    • C. 

      To protect the system by automatically opening the circuit when a fault occurs

    • D. 

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

  • 8. 
    What OCB component supplies amperage to the protective relays?
    • A. 

      Timer ports

    • B. 

      Main contacts

    • C. 

      Terminal bushings

    • D. 

      Current transformers

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

      25%

    • B. 

      55%

    • C. 

      75%

    • D. 

      95%

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

      Fused cutout

    • B. 

      Sectionalizer

    • C. 

      Oil Circuit breaker

    • D. 

      Oil Circuit recloser

  • 11. 
    Which of these devices must be backed up by a recloser of proper size?
    • A. 

      Fused cutout

    • B. 

      Transformer

    • C. 

      Sectionalizer

    • D. 

      Lightning arrester

  • 12. 
    Why is the Arc extinguished so quickly in a vacuum recloser?
    • A. 

      The high-voltage contacts separate so fast

    • B. 

      There is very little oxygen to burn

    • C. 

      The oil absorbs the fault current

    • D. 

      Halon is used as an extinguisher

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

      2 1/2 times

    • B. 

      4 times

    • C. 

      6 1/2 times

    • D. 

      8 times

  • 14. 
    What is usually installed with an oil circuit breaker to allow for equipment maintenance, letting you keep the circuit in operation?
    • A. 

      Fused cutouts

    • B. 

      Knife blades

    • C. 

      Fused cutout and a backup oil circuit recloser

    • D. 

      Knife blades and a normally open air-break switch

  • 15. 
    Oil circuit breaker contacts that are discolored by excessive heat should be
    • A. 

      Filed

    • B. 

      Dressed

    • C. 

      Adjusted

    • D. 

      Replaced

  • 16. 
    The oil in oil circuit breakers (OCB) should be checked dielectrically
    • A. 

      Monthly

    • B. 

      Every 3 months

    • C. 

      Every 6 months

    • D. 

      Yearly

  • 17. 
    Scheduling maintenenance on an oil circuit recloser depends on the
    • A. 

      High-voltage rating and the average load

    • B. 

      Climatic conditions of the local area and past maintenance records

    • C. 

      Types of overcurrent and overvoltage relays and the cleanliness of the insulator bushings.

    • D. 

      Severity and number of reclosing operations and the dielectric strength of the insulating oil.

  • 18. 
    Strong odor from the gas in a sulfur hexaflouride circuit breaker is an indication that
    • A. 

      Breaker load is too high

    • B. 

      Gas pressure is too high

    • C. 

      Gas decomposition has taken

    • D. 

      Insulation breakdown has taken place

  • 19. 
    Clean a modern air switch that has been closed for a long time by
    • A. 

      Using a clean cloth and a wire brush

    • B. 

      Using wire wool and silicon grease

    • C. 

      Sanding lightly with emery cloth

    • D. 

      Opening and closing the switch several times

  • 20. 
    Battery bank maintenance is normally done
    • A. 

      Monthly

    • B. 

      Every 6 monthly

    • C. 

      Yearly

    • D. 

      Every 5 Years

  • 21. 
    What is used to test a battery cell for its specific gravity?
    • A. 

      Litmus paper

    • B. 

      Barometric gauge

    • C. 

      Colormetric chart

    • D. 

      Hydrometer Syringe

  • 22. 
    What must be done if water is added to a battery in freezing temperatures?
    • A. 

      Warn the battery

    • B. 

      Charge the battery

    • C. 

      Add a teaspoon of antifreeze

    • D. 

      Mix the solution with a stainless steel rod

  • 23. 
    Dielectric test voltage for a realy rated at 600 volts is
    • A. 

      400 volts

    • B. 

      1,500 volts

    • C. 

      2,200 volts

    • D. 

      6,600 volts

  • 24. 
    After a wiring change to a control device, substation circuit should be checked for
    • A. 

      Proper operation

    • B. 

      Proper adjustment

    • C. 

      Adeqate clearances

    • D. 

      Tightness of connections

  • 25. 
    What is the maintenance interval for voltages regulators?
    • A. 

      Monthly

    • B. 

      Every 6 months

    • C. 

      Annually

    • D. 

      Every 5 years

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