Power Systems
Lightning arresters are used for

 protection of equipment from open circuits
All of these
 protection of equipment from short circuits
 protection of equipment from external lightning

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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 operating coil current.
  operating coil current and restraining coil current.
  fault current and restraining coil current.

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