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+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION 
+
+// PART IV : UTILIZATION AND TRACTION
+// CHAPTER 1: INDUSTRIAL APPLICATIONS OF ELECTRIC MOTORS
+
+// EXAMPLE : 1.13 :
+// Page number 689
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+V = 250.0      // Voltage of DC shunt motor(V)
+N_1 = 400.0    // No load speed(rpm)
+R_a = 0.5      // Armature resistance(ohm)
+N_2 = 200.0    // Speed with additional resistance(rpm)
+I_a = 20.0     // Armature current(A)
+
+// Calculations
+k_phi = (V-I_a*R_a)/N_1    // kΦ
+R = (V-k_phi*N_2)/I_a      // Resistance(ohm)
+R_add = R-R_a              // Additional resistance to be placed in armature circuit(ohm)
+
+// Results
+disp("PART IV - EXAMPLE : 1.13 : SOLUTION :-")
+printf("\nResistance to be placed in the armature circuit = %.f ohm\n", R_add)
+printf("\nNOTE: ERROR: The given data doesnt match with example 1.7 as mentioned in problem statement")