Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

 this must be a short line
 this may either be a medium line or short line
 this expression is true for any line
None of these

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

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