Power Systems
Which of following are the fertile materials

 U233 and Pu239.
  U238 and Th232.
 U238 and Th239.
 U238 and Pu239.

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Power Systems
In hydroelectric power plants

 both operating and initial cost are high.
 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.

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