Power Systems
A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

 0.8, 0.6 and 1.2 pu
 0.6, 0.6 and 1.2 pu
 0.8, 0.8 and 1.2 pu
 0.6, 0.8 and 1.2 pu

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

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Power Systems
In Rankine cycle, the work output from a turbine is given by

  change of enthalpy between inlet and outlet.
  change of entropy between inlet and outlet.
  change in temperature between inlet and outlet.
  change in internal energy between inlet and outlet.

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