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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 : 1.11 :
+// Page number 687
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+V = 220.0       // DC series motor voltage(V)
+I_1 = 20.0      // Armature current at 800rpm(A)
+N_1 = 800.0     // Speed of dc series motor(rpm)
+R_div = 0.4     // Diverter resistance(ohm)
+R_a = 0.5       // Armature resistance(ohm)
+R_f = 0.2       // Series field resistance(ohm)
+
+// Calculations
+E_b1 = V-(R_a+R_f)*I_1          // Back emf at 800 rpm(V)
+I_2 = I_1*R_div/(R_div+R_f)     // Series field current at new speed(A)
+E_b2 = V-(R_a*I_1+R_f*I_2)      // Back emf at new speed(V)
+N_2 = I_1*N_1*E_b2/(I_2*E_b1)   // New speed with diverter(rpm)
+
+// Results
+disp("PART IV - EXAMPLE : 1.11 : SOLUTION :-")
+printf("\nSpeed of motor with a diverter connected in parallel with series field, N_2 = %.f rpm", N_2)