Switchgear Protection MCQ

Switchgear Protection MCQ | 0 comments

MCQs on Switchgear and Protection | Electrical engineering switchgear and protection

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Switchgear is defined as the apparatus used for switching electric current and apparatus. Since control and protection are 2 applications. Primary winding of a current CT which is connected in series with the line to be protected.

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    Question 1: Minimum arcing voltage will be least in case of ?

  • carbon
  • graphite
  • silver
  • tungsten

    • Answers: silver

    Question 2: Air used in air blast circuit breaker ?

  • must be free from moisture
  • must be ionized
  • must have oil mist
  • must have least CO2

    • Answers: must be free from moisture

    Question 3: The under voltage relay can be used for ?

  • motors
  • busbars
  • generators
  • all of the above

    • Answers: all of the above

    Question 4: For cost and safety, the outdoor substations are installed for voltages above?

  • 60 kV
  • 33 kV
  • 110 kV
  • 11 kV

    • Answers: 33 kV

    Question 5: ........ relay is preferred for phase fault on short transmission line?

  • None of the above
  • Induction type
  • Reactance
  • Impedence

    • Answers: Reactance

    Question 6: The single phasing relays are used for the protection of?

  • single phase motors only
  • two single phase motors running in parallel
  • two phase motors only
  • three phase motors

    • Answers: three phase motors

    Question 7: The material used for bus bars should have ?

  • low resistivity
  • all of the above
  • low cost
  • higher softening temperature

    • Answers: all of the above

    Question 8: Wave trap is used to trap waves of ?

  • power frequencies
  • either of the above
  • higher frequencies entering generator or transformer units
  • none of the above

    • Answers: higher frequencies entering generator or transformer units

    Question 9: Merz-Price protection is used for?

  • alternators
  • air cooled transformers
  • long transmission lines
  • short transmission lines

    • Answers: alternators

    Question 10: Which system will need the lightning arrester of least voltage rating ?

  • Reactance grounded neutral system
  • Resistance grounded neutral system
  • Insulated neutral system
  • Solid ground neutral system

    • Answers: Solid ground neutral system

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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