Power Systems
Which of the following power plants can generate power at unpredictable or uncontrollable time

 Pulverising unit.
 Condenser.
 Wind turbine.
 Cooling tower.

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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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