Power Systems
MCB stands for

  miniature circuit breaker.
  maximum capacity breaker.
  molded circuit breaker.
  minimum capacity breaker.

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  operating coil current and restraining coil current.
  number of turns of restraining and operating coil.
  fault current and restraining coil current.
  fault current and operating coil current.

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