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+// Example 11.5
+// Computation  using linear approximation to show the gross error that occurs 
+// when a linear assumption is applied to compound motors operating at overload 
+// conditions
+// Page No. 456
+
+clc;
+clear;
+close;
+
+// Given data
+Nf=577;                  // Turns per pole of the shunt motor
+IF=4.88;                 // Field current
+Ns=4.5;                 
+IA=450.09;               // Armature current
+F2=4367.8;               // mmf
+VT=240;                  // Voltage value of motor
+RF=49.2;                 // Resistance of shunt motor
+HP=125;
+perratedload=0.854;      // Percentage rated load
+Rx1=17.8;                // Value of resistance in Example 11.2
+
+
+Fnet1=(Nf*IF)+ (0.90 * Ns*IA);   
+Ia2=Fnet1*IA/F2;         // Armature current
+
+If2=(F2 - Ns*Ia2*0.90)/Nf;
+Rx=(VT/If2)-RF;         // External resistance required
+
+// Error introduced by linear approximation
+PE=(17.8-Rx)/17.8*100;
+
+// Display result on command window
+printf("\n External resistance required in series = %0.2f Ohm ",Rx);
+printf("\n Error introduced by linear approximation = %0.1f Percent ",PE);
+