Power Systems
In hydroelectric power plants

  operating cost is low and initial cost is high.
 operating cost is high and initial cost is low.
 both operating and initial cost are high.
 both operating and initial cost are low.

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Power Systems
The VSWR of transmission line is

  Directly proportional to load impedance and inversely to characteristic impedance.
 Proportional to load and characteristic impedance.
 Directly proportional to voltage minimum and inversely proportional to voltage maximum.
 Directly proportional to characteristic impedance and inversely to load impedance.

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

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