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

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Power Systems
The modern trend in electric power generation

  none of above.
 to have large size thermal plants near load centre.
 to have large size thermal plant located near coal fields.
 to have large number of small size thermal plants located at different places.

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