Power Systems
Critical mass of the fuel is the amount required to make the multiplication factor

 0.5.
 less than 1.
 more than 1.
  equal to factor.

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Power Systems
In hydroelectric power plants

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

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