Power Systems
Which of following are the fertile materials

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

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in same units
 base value of quantity /actual value of quantity in different units
 actual value of quantity /base value of quantity in same units

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