Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 1600 MW
 400 MW
 200 MW
 800 MW

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 lowering the value of K below and keeping at that lowered value.
 raising the value of K above 1 and keeping it at raised value.
  raising the value of K above 1, but later bringing it back to K = 1.
 lowering the value of K below 1 but later bringing it back to K = 1.

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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 height of water level in the river where the storage is provided.
 all of above.
  the difference of water level between the level in storage and tail race.

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