Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 lowering the value of K below and keeping at that lowered value.
 raising the value of K above 1 and keeping it at raised value.
 lowering the value of K below 1 but later bringing it back to K = 1.
  raising the value of K above 1, but later bringing it back to K = 1.

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

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

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