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+//Electric Drives:concepts and applications by V.subrahmanyam
+//Publisher:Tata McGraw-Hill 
+//Edition:Second 
+//Ex4_3
+clc;
+clear;
+P=10000;
+V=240;// voltage in V
+N=1000;//Speed in rpm
+Eff1=0.87;//Efficiency in %
+Vs=250;// voltage in V
+f=50;//frequency in Hz
+Alpha=0.5;//angle
+R=0.40;// Resistance in ohm
+Fdf=1;//fundamental displacement factor
+df=0.9;//distortion factor
+pf=0.9;//the power factor
+Pi=P/Eff1;
+I=Pi/V;
+Eb=V-(I*R);
+Vi=0.9*Vs;
+Eb1=Vi-(I*R);
+N1=(Eb1/Eb)*N;
+Pi1=V*I*pf*(10)^(-3);
+Pi2=(Pi1*N1)/N;
+Vc=0.9*Vs*Alpha;
+Eb2=Vc-(I*R);
+N2=(N*Eb2)/Eb;
+P0=((Pi1*N2)/N)*1000;
+Pi0=Vc*I;
+Eff=(P0/Pi0)*100;
+disp(Eff,"Efficiency in % is:")
+//Result vary due to roundoff error