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

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Power Systems
Which of the following statements is true? Corona loss increases with

 decrease in conductor size and increase in supply frequency
 increase in conductor size and decrease in supply frequency
 decrease in conductor size and decrease in supply frequency
 increase in conductor size and increase in supply frequency

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Power Systems
The skin effect shows that

 current density is lower at the surface of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is more at the centre of the condutor
 current density is more at the surface of the condutor

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