Power Systems
Under excited Synchronous phase modifier works as

 shunt reactor
 shunt capacitor
 any of the above
 series capacitor

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

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