Power Systems
By using guard ring in a transmission line, its string efficiency

 decrease
 remains unaffected
 increase
None of these

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Power Systems
In a pressurized water reactor

 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.
 the coolant water boils in the reactor core.

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