Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j6 pu
 j3 pu
 j9 pu
 j1 pu

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Power Systems
An hydro-graph indicates

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

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