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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 : 1.7 :
+// Page number 685-686
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+V = 230.0      // Voltage of DC shunt motor(V)
+N_1 = 1000.0   // No load speed(rpm)
+R_sh = 40.0    // Shunt resistance(ohm)
+N_2 = 1200.0   // Speed with series resistance(rpm)
+
+// Calculations
+phi_2 = N_1/N_2        // Flux_2 in terms flux_1
+I_N1 = V/R_sh          // Exciting current at 1000 rpm(A)
+phi_1 = 11.9           // Flux corresponding to I_N1(mWb)
+phi_N2 = phi_1*phi_2   // Flux at 1200 rpm(mWb)
+I_phi_N2 = 3.25        // Exciting current corresponding to phi_N2(A)
+R = V/I_phi_N2         // Resistance in field circuit(ohm)
+R_extra = R-R_sh       // Resistance to be placed in series with shunt field(ohm)
+
+// Results
+disp("PART IV - EXAMPLE : 1.7 : SOLUTION :-")
+printf("\nResistance to be placed in series with shunt field = %.1f ohm", R_extra)