Power Systems
Gross head of an hydroelectric power station is

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

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Power Systems
Advantages of shunt compensation is/are

 single unit can be used as both capacitance and inductor by adjusting the excitation
 smooth voltage regulation is possible by controlling excitation
All of these
 It requires less maintanance

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Power Systems
A sodium graphite reactors use

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

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