Power Systems
In hydroelectric power plants

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

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

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

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