Power Systems
An impulse turbine

 makes use of a draft tube.
  operates by initial complete conversion to kinetic energy.
 always operates submerged.
 is most suited for low head and high discharge power plants.

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Power Systems
In a pressurized water reactor

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

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