Power Systems
In an interconnected power system, the most suitable power plant to meet the peak load condition is

 thermal plant
 pumped storage plant
 nuclear plant
 hydro power plant

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

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