Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 1
 AD - BC = -1
 AD - BC = 0
 AD + BC = 0

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Power Systems
An hydro-graph indicates

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

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