Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 both 1 and 2
 nether 1 nor 2
 Rated voltage and frequency has to be supplied to the consumers

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Power Systems
Gross head of an hydroelectric power station is

 all of above.
  the difference of water level between the level in storage and tail race.
 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.

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