Power Systems
In an induction relay for a particular current setting the operating time 4 sec. When the time multiplier setting is 0.8 if the time multiplier setting is rest to 1 the operating time is

  1.
 5.
 10.
  un changed.

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Power Systems
Gross head of an hydroelectric power station is

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

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

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

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