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+// Example 11.3
+// Computation of Speed if the load is reduced to a value that causes the 
+// armature current to be 30 percent of the rated current
+// Page No.453
+
+clc;
+clear;
+close;
+
+// Given data
+HP=100;
+perratedload=0.896;     // Percentage rated load
+VT=240;                 // Voltage value of motor
+Ns=14;                  // Number of turns/pole in series field
+Ra=0.0202;              // Armature resistance
+RIP=0.00588;            // Interpole winding resistance
+Rs=0.00272;             // Resistance of series field winding
+n1=650;                 // Speed of shunt motor
+Bp2=0.34;               // Air gap flux density from magnetization curve
+Bp1=0.87;               // Air gap flux density from magnetization curve
+
+// Computation of Speed if the load is reduced to a value that causes the 
+// armature current to be 30 percent of the rated current
+
+Pin=HP*746/perratedload;       // Input power
+IT=Pin/VT;                     // Total current
+Ia=IT;                         // Armature current
+
+Racir=Ra+RIP+Rs;               // Resistance of armature circuit
+Fnet1=Ns*Ia*(1-0.080);         // Net mmf
+Fnet2=0.30*Fnet1;              // Net mmf from magnetization curve
+n2=n1/((VT-(Ia*Racir))/Bp1 * Bp2/(VT-(0.30*Ia*Racir)));
+
+// Display result on command window
+printf("\n Speed of the motor = %0.0f r/min ",n2);
+
+