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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 12: POWER,ENERGY,AND EFFICIENCY RELATIONS OF DC AND AC DYNAMOS
+// Example 12-6
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+V = 240 ; // Voltage rating of dc shunt motor in volt
+P_hp = 5 ; // Power rating of dc shunt motor in hp
+S = 1100 ; // Speed in rpm of the dc shunt motor
+R_a = 0.4 ; // Armture resistance in ohm
+R_f = 240 ; // Field resistance in ohm
+I_L = 20 ; // Rated line current in A 
+
+// Calculations
+// Preliminary calculations
+V_f = V ; // Voltage across field winding in volt
+I_f = V_f / R_f ; // Field current in A
+I_a = I_L - I_f ; // Armature current in A
+P_o = P_hp * 746 ; // Power rating of dc shunt motor in W
+V_a = V ; // Voltage across armature in volt
+E_c_fl = V_a - I_a*R_a ; // back EMF in volt
+
+// case a
+E_c = E_c_fl ;
+P_d = E_c * I_a ; // Power developed by the armature in W
+
+// case b
+P_r = P_d - P_o ; // Full-load rotational losses in W
+
+// case c
+P_in = V*I_L ; // Input power in W
+eta = (P_o/P_in)*100 ; // Full-load efficiency 
+
+// Display the results
+disp("Example 12-6 Solution : ");
+
+printf(" \n Preliminary calculations using nameplate data : ");
+printf(" \n Field current : I_f = %d A \n ",I_f);
+printf(" \n Armature current : I_a = %d A \n ",I_a);
+printf(" \n P_o = %d W ",P_o );
+printf(" \n E_c(fl) = %.1f V \n",E_c_fl);
+
+printf(" \n a: Power developed by the armature :\n    P_d = %.1f W \n",P_d);
+
+printf(" \n b: Full-load rotational losses :\n    P_r = %.1f W \n",P_r);
+
+printf(" \n c: Full-laod efficiency :\n    η = %.1f percent ",eta );