Power Systems
A load centre is at an equidistant from the two thermal generating stations G1 and G2. The fuel cost characteristics of the generating stations are given by F1 = a + bP1 + cP²1 F2 = a + b P2 + 2cP²2 Where P1 and P2 are the generation in MW of G1 and G2, respectively. For most economic generation to meet 300 MW of load, P1 and P2 respectively, are

 200, 100
 175, 125
 100, 200
 150, 150

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

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

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