Power Systems
Advantages of pumped storage plants is/are

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

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Power Systems
A sodium graphite reactors use

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

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Power Systems
Half life is defined as

 none of above.
 the time required for full of atoms in a specimen disintegrate.
  the time required for one half of isotope to decay.
 the time required to spiliting of a heavy nucleus.

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