Power Systems
Earthing switch is used for

All of these
 discharging residual energies
 measuring of safety voltage
 protection of equipment from ground faults

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Power Systems
In a pressurized water reactor

 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.
  both B and C.
 the coolant water boils in the reactor core.

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