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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 4: DC Dynamo Torque Relations-DC Motors
+// Example 4-14
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+// Cumulative DC compound motor acting as shunt motor
+T_orig = 160 ; // Original torque developed in lb.ft
+I_a_orig = 140 ; // Original armature current in A
+phi_f_orig = 1.6e+6 ; // Original field flux in lines
+
+// Reconnected as a cumulative DC compound motor
+T_final_a = 190 ; // Final torque developed in lb.ft (case a)
+
+// Calculations
+phi_f = phi_f_orig * ( T_final_a / T_orig ) ; // Field flux in lines
+percentage = ( phi_f / phi_f_orig ) * 100 - 100 ; // percentage increase in flux
+
+phi_f_final = 1.1 * phi_f ; // 10% increase in load causes 10% increase in flux
+I_a_b = 154 ; // Final armature current in A (case b)
+T_f = T_final_a * ( I_a_b / I_a_orig ) * ( phi_f_final / phi_f ) ; 
+// Final torque developed
+
+// Display the results
+disp(" Example 4-14 Solution : ");
+printf(" \n a: phi_f = %.1e lines \n ", phi_f );
+printf(" \n    Percentage of flux increase = %.1f percent \n ", percentage );
+
+printf(" \n b: The final field flux is 1.1 * 1.9 * 10 ^ 6 lines " );
+printf(" \n    (due to the 10 percent increase in load).The final torque is\n");
+printf(" \n    T_f = %.1f lb-ft ", T_f );