Power Systems
The area under a flow duration curve represents

 total of units of energy available.
 total power available.
 maximum rate of run-off during the period.
  total quantity of run-off during that period.

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with positive sign
 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus i
 sum of admittances connected at bus j

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