Power Systems
Power transmission lines are transposed to reduce

 ferranti effect
 proximity effect
 radio interference
 skin effect

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Power Systems
Gross head of an hydroelectric power station is

 all of above.
 the height of water level in the river where the storage is provided.
 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.

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