Power Systems
If power P available from a hydroelectric plant is given by the formula P = 9.81QH, where Q is the flow rate through the turbine in l / s and H is the head in meters, then P will be unit of

 kJ / S.
  W.
 HP.
 kWh.

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Power Systems
The draft tube is provided to

 reduce the effect of water hammer.
None of these
  increase the acting head on the water wheel.
 raise the water surface of the stream to create an artificial head.

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