Power Systems
Advantages of pumped storage plants is/are

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

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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the tail race is provided.
 the height of water level in the river where the storage is provided.
 all of above.
  the difference of water level between the level in storage and tail race.

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