Power Systems
The draft tube is provided to

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

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Power Systems
Gas coolled reactor

 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.
 use CO2. or helium as coolant and graphite the moderator.
 use heavy water as coolant as well as moderator.
  both B and C.

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