Power Systems
How to find the total number of strands (N) when number of layers (x) are given

 Total number of strands N = 3x² - 3x - 1
 Total number of strands N = 3x² - 3x + 1
 Total number of strands N = 3x² + 3x - 1
 Total number of strands N = 3x² + 3x + 1

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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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Power Systems
ACSR means

 Aluminium core steel reinforced
 all conductor steel reinforced
 Aluminium copper steel reinforced
 Aluminium conductor steel reinforced

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