Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 12.
 16.
  24.
 6.

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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 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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