Power Systems
What is the function of economiser in steam boilers

 collect ash particals
 improving thermal efficiency
All of these
 cooling

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Power Systems
Gross head of an hydroelectric power station is

 all of above.
 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.
 the height of water level in the river where the storage is provided.

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