Power Systems
The positive sequence reactance will be equal to negative sequence if the equipment is

  transformer and transmission lines.
  none of these.
  motor.
  generator.

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Power Systems
Critical mass is

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

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

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

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