Capacitors, Cables, Bus Bars, Test Lab

41 Questions | Total Attempts: 251

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Electrical Quizzes & Trivia

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Questions and Answers
  • 1. 
    What is the effect of series capacitors on a transmission line?
    • A. 

      Shortens the line electrically

    • B. 

      Auxiliary synchronous machines

    • C. 

      Impedance

    • D. 

      Lengthens the line electrically

  • 2. 
    The purpose of adding series capacitors on a transmission line is to 
    • A. 

      Increase flow on the line by decreasing impedance (making line electrically shorter)

    • B. 

      Compensate for the vars produced by the line

    • C. 

      To increase the total vars

    • D. 

      To decrease the total vars

  • 3. 
    A dielectric material is mostly a  _____?
    • A. 

      Conductor

    • B. 

      Insulator

    • C. 

      Magnetic field

    • D. 

      Metallic

  • 4. 
    When performing an insulation test on a cable, which test is not commonly performed?
    • A. 

      AC/DC breakdown test

    • B. 

      Doble power factor test

    • C. 

      CT saturation test

    • D. 

      Megger test

  • 5. 
    When performing an insulation resistance test which test is most commonly performed?
    • A. 

      AC/DC breakdown test

    • B. 

      Doble power factor test

    • C. 

      CT saturation test

    • D. 

      Megger test

  • 6. 
    When performing a power factor test to test the dielectric which test is most commonly performed?
    • A. 

      AC/DC breakdown test

    • B. 

      Doble power factor test

    • C. 

      CT saturation test

    • D. 

      Megger test

  • 7. 
    Which test can be used to test insulation but can be harmful particularly to dc test?
    • A. 

      AC/DC breakdown test

    • B. 

      Doble power factor test

    • C. 

      CT saturation test

    • D. 

      Megger test

  • 8. 
    Which vertical run of the following cable needs more support
    • A. 

      Aluminum

    • B. 

      Aluminum clad Copper

    • C. 

      Copper

    • D. 

      All need the same

  • 9. 
    The purpose of dielectric in cable is for
    • A. 

      Reduce void formed during manufacturing

    • B. 

      Increase emissivity

    • C. 

      Increase electric dissipation factor

    • D. 

      Increase breakdown voltage

  • 10. 
    What type of insulation can not be used on 115KV Cable?
    • A. 

      Paper

    • B. 

      Gas

    • C. 

      Oil

    • D. 

      XLPE

  • 11. 
    Which insulation carries the highest voltage?
    • A. 

      Paper

    • B. 

      Gas

    • C. 

      Oil

    • D. 

      XLPE

  • 12. 
    What is the purpose of the semi-conducting material between the conductor and insulation and between the insulation and shield of a synthetic type underground cable?
    • A. 

      Reduce voids forming during manufacturing

    • B. 

      Increase breakdown voltage

    • C. 

      Increase the electric dissipation factor

    • D. 

      Increase emissivity

  • 13. 
    In sizing conductors, what is least considered of the following
    • A. 

      Voltage drop

    • B. 

      Heating effect due to conductor proximity, conduit enclosure

    • C. 

      Tripping of circuit breaker protective device

  • 14. 
    What will limit utilizing the full capacity of conductor
    • A. 

      Series reactance

    • B. 

      Shunt capacitance

    • C. 

      Line losses

    • D. 

      Voltage drop

  • 15. 
    The greatest effect of a fault on a system is on
    • A. 

      Transient

    • B. 

      Subtransient

    • C. 

      Steady state

  • 16. 
    Equal area criterion for power stability for initial fault clearing is
    • A. 

      Power versus power angle

    • B. 

      Time versus System Angle

  • 17. 
    Emissivity is the measure of the power radiated by a body relative to that radiated by an ideal black body( idealized material which absorbs all incident energy and reflects none)  at the same temperature
    • A. 

      True

    • B. 

      False

  • 18. 
    The absorptivity of a material is affected primarily by its
    • A. 

      Surface

    • B. 

      Elasticity

    • C. 

      Enthalpy

    • D. 

      Divisity

  • 19. 
    What is the effect of adding a series capacitance to long HV 500KV transmission line:
    • A. 

      Increase angle between the sending end voltage and receiving end voltage

    • B. 

      Line becomes electrically longer

    • C. 

      Offset line inductance for maximum power transfer

    • D. 

      Stability is degraded

  • 20. 
    Bus Bar design using Copper over aluminum because
    • A. 

      Aluminum has higher surface emissivity

    • B. 

      Copper is more corrosive

    • C. 

      Copper has higher thermal coefficient

    • D. 

      Copper has lower thermal coefficient

  • 21. 
    Which of the following changes would make the least difference in the resistance of a ground rod installation?
    • A. 

      Increasing the spacing from 1 to 3 ft

    • B. 

      Doubling the number of ground rods

    • C. 

      Doubling the diameter of the ground rods

    • D. 

      Increasing the depth of the rods from 4 to 6 feets

  • 22. 
    The most important function of the shield on underground cable operated at 2KV or above is to provide
    • A. 

      A moisture barrier for the cable insulation

    • B. 

      Conductance needed for the charging current

    • C. 

      A tangential pattern of electrical stresses

    • D. 

      A radial pattern of electrical stresses

  • 23. 
    Which cable insulation carries the highest voltage
    • A. 

      Paper

    • B. 

      Gas

    • C. 

      Oil

    • D. 

      Silicon

  • 24. 
    What is not an insulation test?
    • A. 

      AC/DC breakdown test

    • B. 

      Double dower factor

    • C. 

      CT saturation test

    • D. 

      Megger test

  • 25. 
    DC Hipot test of equipment is:
    • A. 

      Diaelctric Test

    • B. 

      Pass/Fail

    • C. 

      Non-destructive

    • D. 

      Diaelctric Test and Pass/Fail

    • E. 

      Diaelctric Test and Non-destructive

    • F. 

      Destructive

    • G. 

      Diaelctric Test and Pass/Fail and Destructive

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