Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

 20.
 10.
 55.1.
  5.

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Power Systems
Gross head of an hydroelectric power station is

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

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