Power System Protection MCQs Part 24

Electrical Engineering MCQs on Power System Protection

Power System Protection MCQs Part 24

Contents

The arc voltage produced in an AC circuit breaker is always

The arc voltage produced in an AC circuit breaker is always

  1. In phase with the arc current
  2. In phase opposition with the arc current
  3. Lagging the arc current by 90°
  4. Leading the arc current by 90°

Correct answer: 1. In phase with the arc current

Capacitance voltage transformer is used to

Capacitance voltage transformer is used to

  1. Connect instruments on the LT side
  2. Improve the power factor of the transmission
  3. Reduce losses in power transmission line
  4. None of these

Correct answer: 2. Improve the power factor of the transmission

Merz price current scheme protection is used for protection of

Merz price current scheme protection is used for protection of

  1. Transformer
  2. Alternator
  3. Both of these
  4. Bus bars only

Explanation: Merz price current scheme protection is a differential protection scheme that is used in transformer and alternators for providing protection.

For which of the below mentioned protection from negative sequence currents is provided

For which of the below mentioned protection from negative sequence currents is provided

  1. Generators
  2. Motors
  3. Transformers
  4. Transmission line

Correct answer: 1. Generators

The relay that is preferred for phase fault on short transmission line

The relay that is preferred for phase fault on short transmission line

  1. Impedance
  2. Induction type
  3. Reactance
  4. None of these

Correct answer: 3. Reactance

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