Power Systems
Gross head of an hydroelectric power station is

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

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Power Systems
In boiler water reactor (BWR)

 there is danger of radioactive contamination of steam.
 the feed water acts both coolant and a moderator.
  all of above.
 enriched uranium is used as fuel.

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