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?

 88.2%
 11.8%
 15%
 85%

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Power Systems
An hydro-graph indicates

All of these
 the discharge at any time during the period under consideration.
 the maximum and minimum run off during the period.
 the average run off during the period.

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