Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.200 pu.
  3.000 pu.
 0.075 pu.
 0.125 pu.

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

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