Power Systems
In a pressurized water reactor

  both B and C.
 water is used at high pressure so that it is available is liquid from at about 280° C.
 the coolant water boils in the reactor core.
 heavy water is used as both coolant and moderator.

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Power Systems
The draft tube is provided to

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

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