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+//CHAPTER 10- THREE-PHASE INDUCTION MACHINES
+//Example 9
+
+disp("CHAPTER 10");
+disp("EXAMPLE 9");
+
+//VARIABLE INITIALIZATION
+p=150*1000;                      //in Watts
+v=3000;                          //in Volts
+f=50;                            //in Hertz
+P=6;                             //number of poles
+ratio=3.6;                       //ratio of stator turn to rotor turn
+r2=0.1;                          //rotor resistance in Ohms
+L=3.61/1000;                     //leakage inductance per phase in Henry
+
+//SOLUTION
+
+//solution (a)
+X2=2*%pi*f*L;   
+E1=v/sqrt(3);
+E2=E1*(1/ratio);
+z1=sqrt((r2^2)+(X2^2));
+I2=E2/z1;                         //rotor current
+I_s=I2/ratio;                     //stator current
+N_s=(120*f)/P;
+w=(2*%pi*N_s)/60;
+T_s1=(3*E2^2*r2)/(w*z1^2);
+disp(sprintf("(a) The starting current is %.1f A and torque is %.0f N-m",I_s,T_s1));
+
+//solution (b)
+I_s1=30;
+I_r=ratio*I_s1;
+r=sqrt(((E2/I_r)^2)-(X2^2));
+r_ext=r-r2;
+z2=sqrt((r_ext^2)+(X2^2));
+T_s2=(3*E2^2*r)/(w*z2^2);
+disp(sprintf("(b) The external resistance is %.2f Ω and torque is %.2f N-m",r_ext,T_s2));
+
+//There answers are different due to precision of floating point numbers  
+
+//END