Power Systems
A thermal power station needs space

 less than that required by a gas turbine power plant of same output.
 less than that required by atomic power station of the same output.
  less than that required by hydro-power station of same capacity.
 less than that required by the diesel power station of same output.

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Power Systems
In a pressurized water reactor

 heavy water is used as both coolant and moderator.
 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.
  both B and C.

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