Power Systems
Surge impedance loading of a transmission line can be increased by

 addition of lumped inductance in parallel
 increasing its voltage level
 both 1 and 3
 addition of lumped capacitance in series

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Power Systems
An hydro-graph indicates

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

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