Power Systems
Due to proximity effect, the increase in conductor resistance is not negligible in

 underground cable
 overhead transmission lines
 communication lines
All of these

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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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