Switchgear Protection MCQ

Switchgear Protection MCQ | 0 comments

switch gear and protection MCQ | Power System Protection and Switchgear MCQ

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Important MCQ on Switchgear and Protection. MCQs MCB MCQs ELCB MCQ MCCB MCQs switchgear MCQs Switchgear and Protection MCQs.

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    Question 1: Which portion of transmission system is least prone to faults?

  • Switchgear
  • Overhead lines
  • Alternators
  • None of the above

    • Answers: Alternators

    Question 2: In a contacter, interrupting medium maybe?

  • any of the above
  • SFs gas
  • air
  • oil

    • Answers: any of the above

    Question 3: A .......... is used to measure the stator .. winding temperature of the generator?

  • pyrometer
  • thermometer
  • thermocouple
  • Resistance thermometer

    • Answers: Resistance thermometer

    Question 4: The rating of a circuit breaker is generally determined on the basis of?

  • line -to-line fault current
  • symmetrical fault current
  • single line to ground fault current
  • double line to ground fault current

    • Answers: symmetrical fault current

    Question 5: Arc in a circuit breaker is interrupted at ?

  • minimum voltage
  • maximum current
  • zero current
  • maximum voltage

    • Answers: zero current

    Question 6: Which of the following is not a part of the circuit breaker ?

  • Operating mechanism
  • Fixed and moving contacts
  • Explosion pot
  • Conservator

    • Answers: Conservator

    Question 7: Protective relays are devices that detect abnormal conditions in electrical circuits by measuring ?

  • voltage during abnormal condition
  • constantly the electrical quantities which differ during normal and abnormal conditions
  • none of the above
  • current during abnormal condition

    • Answers: constantly the electrical quantities which differ during normal and abnormal conditions

    Question 8: A differential relay measures the vector difference between ?

  • currents
  • two voltages
  • two or more similar electrical quantities
  • none of the above

    • Answers: two or more similar electrical quantities

    Question 9: The advantage of neutral earthing is ?

  • freedom from persistent arcing grounds
  • all of the above
  • simplified design earth fault protection
  • over voltages due to lightning can be discharged to earth

    • Answers: freedom from persistent arcing grounds

    Question 10: In circuit breakers, the advantage of using oil as quenching medium is ?

  • absorption of arc energy
  • oil has high dielectric strength
  • all of the above
  • oil acts as insulator

    • Answers: oil acts as insulator

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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