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Case (i): When Ef is increased by 20%
Power factor pf= 0.75 lagging
Reactive power drawn by the load = 511.2 MVAR
Case (ii): When Ef is decreased by 20%
Power factor pf= 1.00 lagging
Reactive power drawn by the load = 19.5 MVAR
The answers given here are exact values.Textbook answers has an approximat
ion of upto 2 decimal places on Xs,Ia,pf.
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