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+//Electric Drives:concepts and applications by V.subrahmanyam
+//Publisher:Tata McGraw-Hill 
+//Edition:Second 
+//Ex3_6
+clc;
+clear;
+Vs=220;//Supply voltage in V
+f=50;//Frequency in Hz
+Eb=-200;//Back emf in V
+Rd=3;//Resistance in ohm
+Vdc=200;// voltage in V
+Xc=0.314;//Reactance in ohm
+L=0.001;//Inductance in mH
+pf=-0.5;//Powerfactor
+Vdia=0.9*Vs*pf;
+Id=(Vdia-Eb)/(Rd+((2*Xc)/%pi));
+Vd=Id*Rd+Eb;
+a=-pf+((Vd*2)/Vdc);
+b=acos(a);
+c=(b*180)/%pi;
+u=c-120;
+disp(u,"The overlap angle in deg is:")
+//Result vary due to error in calculation of overlap angle in the textbook
+\ No newline at end of file