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.