Power Systems
The area under a flow duration curve represents

 total power available.
  total quantity of run-off during that period.
 maximum rate of run-off during the period.
 total of units of energy available.

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

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

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