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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Power Systems
Critical mass is

  minimum mass of fissionable material required to sustain chain reaction.
 none of these.
 a mass of fissionable material required to stop a chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.

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