Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 10
 21
 13
 20

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Power Systems
The factor affecting run off are

 the topography and nature of soil in the catchment area.
 amount of vegetation and weather condition in the catchment area.
 rain fall pattern, shape and size of catchment area.
  all of above.

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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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