Power Systems
Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line?

 0.52 Hz
 50 Hz
 0.48 Hz
 -0.52 Hz

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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 operating coil current.
  fault current and restraining coil current.

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