Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

 this may either be a medium line or short line
 this must be a short line
None of these
 this expression is true for any line

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Power Systems
In a pressurized water reactor

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

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