Power Systems
A CANDU reactor uses

 highly enriched uranium as fuel and water as moderator and coolant.
 only fertile materials.
  natural uranium as fuel and heavy water as moderator and coolant.
 enriched uranium as fuel and ordinary water as moderator and cooler.

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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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Power Systems
A lossless power system has to serve a load of 250 MW. There are two generators(G1 and G2) in the system with cost curves C1 and C2 respectively defined as follows: C1 = PG1+0.055P²G1 C2 = 3 PG2 + 0.03 P²G2 Where PG1 and PG2 are the MW injections from generators G1 and G2 respectively. Thus, the minimum cost dispatch will be

 PG1 = 250 MW and PG2 = 0 MW
 PG1 = 0 MW and PG2 = 250 MW
 PG1 = 150 MW and PG2 = 100 MW
 PG1 = 100 MW and PG2 = 150 MW

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