Power Systems
Deflectors are provided in

  Pelton wheel.
 Kaplan turbine.
 Francis turbine.
 propeller turbine.

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

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