Power Systems
Which of following are the fertile materials

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

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Power Systems
Which of the following is/are the advantages of synchronous phase modifier over the shunt compensation?

 smooth voltage regulation is possible by controlling excitation
 both 1 and 2
 single unit can be used as both capacitance and inductor by adjusting the excitation
 initial cost is low

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