Power Systems
An ACSR conductor has a diameter of 2 cm has internal inductance of 0.05 mH/Km. If this ACSR is replaced with another having a diameter of 4 cm then its internal inductance is

 0 mH/Km
 0.05 mH/Km
 0.025 mH/Km
 0.1 mH/Km

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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 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 storage is provided.

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