Power Systems
If, for a given alternator in economic operation mode, the incremental cost is given by (0.012 P + 8) Rs/MWh, dPL/dP = 0.2 and plant λ = 25, then power generation is

 750 MW
 1000 MW
 1500 MW
 1250 MW

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Power Systems
The skin effect shows that

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

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