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+//Electric Drives:concepts and applications by V.subrahmanyam
+//Publisher:Tata McGraw-Hill 
+//Edition:Second 
+//Ex1_4a
+clc;
+clear;
+V=440;// voltage in V
+Ia=80;// Current in A
+Na=1200;//Speed in rpm
+Na1=125.6;// Speed in rad/sec
+R1=0.55;// Resistance in ohm
+R2=110;// Resistance in ohm
+N0=600;// Speed in rpm
+N01=62.8;//Speed in rpm
+Nf=300;// Speed in rpm
+Nf1=31.4;// Speed in rpm
+Rsh=1.256;// Resistance in ohm
+E=V-(Ia*R1);
+K=E/Na1; 
+E1=K*N01;
+Tf=K*Ia;
+E2=E1*(Nf/N0);
+V2=E2+(Ia*R1);
+Is=(V2/Rsh)+Ia;
+Il=Is+(V/R2);
+Pi=V*Il;
+Po=Tf*Nf1;
+Eff=(Po/Pi)*100;
+disp(Eff,'the effeciency of the motor in % is:')