Power Systems
A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

 10%
 -10%
 6.92%
 -6.92%

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Power Systems
Critical mass is

 none of these.
  minimum mass of fissionable material required to sustain chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.
 a mass of fissionable material required to stop a chain reaction.

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

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