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+//CHAPTER 8- DIRECT CURRENT MACHINES
+//Example 31
+
+disp("CHAPTER 8");
+disp("EXAMPLE 31");
+
+//series motor 
+//VARIABLE INITIALIZATION
+r_a=0.1;                    //combined resistance of armature & field resistance in Ohms
+v_t=230;                    //in Volts
+I_a1=100;                   //in Amperes
+N1=1000;                    //in rpm
+I_a2=200;                   //in Amperes
+ratio=1.2;                  //ratio of Φ2:Φ1=1.2
+
+//SOLUTION
+//Eb1 dir prop phi1.N1
+//Eb1=Vt-Ia1.Ra
+//=> (Vt-Ia1.Ra) dir prop ph1.N1
+//and 
+//=> (Vt-Ia2.Ra) dir prop ph1.N2
+//=> (Vt-Ia1.Ra)/ (Vt-Ia1.Ra) = phi1.N1/phi2.N2
+//given Phi2=1.2 Phi1 as flux is increased by 20%
+E_b1=v_t-(I_a1*r_a);        //numerator of LHS according to the book
+E_b2=v_t-(I_a2*r_a);        //denominator of LHS according to the book
+N2=(E_b2/E_b1)*(1/ratio)*N1;
+N2=round(N2);               //to round off the value
+disp(sprintf("The new speed of the armature is %d rpm",N2));
+
+//END
+
+
+
+