Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 15%
 85%
 11.8%
 88.2%

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Power Systems
In a pressurized water reactor

  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.
 heavy water is used as both coolant and moderator.

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