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

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Power Systems
In boiler water reactor (BWR)

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

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