Power Systems
When a pumped storage power plant is operated in conjunction with a steam power plant

 the operating cost of the steam plant become optimum
 load factor of the steam plant is increased
All of these
 chances of the tripping of the system decrease

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Power Systems
Half life is defined as

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

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