Power Systems
A power station plant load factor is defined as the ratio of

 minimum load to peak load
 the energy generated to that of maximum energy that could have been generated
 minimum load to average load
 average load to the peak load

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Power Systems
An hydro-graph indicates

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

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