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

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Power Systems
A sodium graphite reactors use

 a mixture of sodium and graphite as coolant.
 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as moderator.
  sodium as coolant and graphite as moderator.

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