Power Systems
Which of following generating plants has the minimum operating cost

 Diesel plant.
 Hydroelectric plant.
 Steam plant.
 Nuclear plant.

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

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

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