Power Systems
On what factors does the selection of a water turbine depend

 Nature of load.
 Working head.
 Speed.
  All of above.

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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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