Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm cosωt?

 2.63 msec
 9.68
 1.47 msec
 4.68 msec

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

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