Power Systems
In which power plant, the thermal efficiency is quite low

  Nuclear power plant.
  Steam power plant.
  Diesel power plant.
  Hydro power plant.

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Power Systems
In a pressurized water reactor

  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.
 heavy water is used as both coolant and moderator.

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