Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 raising the value of K above 1 and keeping it at raised value.
 lowering the value of K below 1 but later bringing it back to K = 1.
 lowering the value of K below and keeping at that lowered value.
  raising the value of K above 1, but later bringing it back to K = 1.

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Power Systems
In hydroelectric power plants

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

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