Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

 air blast circuit breaker.
  SF6 breaker.
 none of these.
 oil circuit breaker.

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Power Systems
In a pressurized water reactor

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

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