Power Systems
In a transmission line the insulators to be used at the dead end or sharp curves are

 any of the above
 suspension type
 strain type
 pin type insulator

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

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