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
 1250 MW
 1000 MW
 1500 MW

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Power Systems
An hydro-graph indicates

All of these
 the average run off during the period.
 the discharge at any time during the period under consideration.
 the maximum and minimum run off during the period.

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