Power Systems
Gross head of an hydroelectric power station is

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

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Power Systems
ACSR means

 Aluminium conductor steel reinforced
 all conductor steel reinforced
 Aluminium core steel reinforced
 Aluminium copper steel reinforced

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