Power Systems
In a biased differential relay the bias is defined as the ratio of

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

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Power Systems
In boiler water reactor (BWR)

  all of above.
 the feed water acts both coolant and a moderator.
 enriched uranium is used as fuel.
 there is danger of radioactive contamination of steam.

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