Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 10
 1000
 90
 9000

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Power Systems
An hydro-graph indicates

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

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