Power Systems
Per unit of any quantity is defined as

 base value of quantity /actual value of quantity in different units
 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in same units

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Power Systems
Gross head of an hydroelectric power station is

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

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Power Systems
Critical mass is

 a mass of fissionable material required to stop a chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.
  minimum mass of fissionable material required to sustain chain reaction.
 none of these.

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