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

 pin type insulator
 any of the above
 strain type
 suspension type

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Power Systems
Gross head of an hydroelectric power station is

 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.
 the height of water level in the river where the tail race is provided.

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