Power Systems
Advantages of pumped storage plants is/are

 operating time is minimum
 most economical as a peak load supply plant
All of these
 used as load frequency control

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Power Systems
A sodium graphite reactors use

 a mixture of sodium and graphite as coolant.
  sodium as coolant and graphite as moderator.
 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as moderator.

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