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?

 85%
 15%
 11.8%
 88.2%

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Power Systems
Which of the following statements is true? Corona loss increases with

 decrease in conductor size and decrease in supply frequency
 increase in conductor size and increase in supply frequency
 increase in conductor size and decrease in supply frequency
 decrease in conductor size and increase in supply frequency

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