Power Systems
In case of failure of prime mover of the generator, which type of relay is used?

 offset mho relay
 impedance relay
 reverse power relay
 distance relays

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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.
 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.
 all of above.

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