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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 6: MOTORS FOR ELECTRIC TRACTION
+
+// EXAMPLE : 6.2 :
+// Page number 788-789
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+N_1 = 500.0    // Speed(rpm)
+I_1 = 50.0     // Current(A)
+E_1 = 220.0    // Armature voltage(V)
+I_2 = 100.0    // Current(A)
+E_2 = 350.0    // Armature voltage(V)
+I_3 = 150.0    // Current(A)
+E_3 = 440.0    // Armature voltage(V)
+I_4 = 200.0    // Current(A)
+E_4 = 500.0    // Armature voltage(V)
+I_5 = 250.0    // Current(A)
+E_5 = 540.0    // Armature voltage(V)
+I_6 = 300.0    // Current(A)
+E_6 = 570.0    // Armature voltage(V)
+R_wb = 0.08    // Armature and brush resistance(ohm)
+R_f = 0.05     // Resistance of series field(ohm)
+V = 600.0      // Operating voltage(V)
+
+// Calculations
+R_a = R_wb+R_f               // Armature resistance(ohm)
+N_11 = N_1/E_1*(V-I_1*R_a)   // Speed(rpm)
+T_1 = 9.55*E_1*I_1/N_1       // Torque(N-m)
+N_2 = N_1/E_2*(V-I_2*R_a)    // Speed(rpm)
+T_2 = 9.55*E_2*I_2/N_1       // Torque(N-m)
+N_3 = N_1/E_3*(V-I_3*R_a)    // Speed(rpm)
+T_3 = 9.55*E_3*I_3/N_1       // Torque(N-m)
+N_4 = N_1/E_4*(V-I_4*R_a)    // Speed(rpm)
+T_4 = 9.55*E_4*I_4/N_1       // Torque(N-m)
+N_5 = N_1/E_5*(V-I_5*R_a)    // Speed(rpm)
+T_5 = 9.55*E_5*I_5/N_1       // Torque(N-m)
+N_6 = N_1/E_6*(V-I_6*R_a)    // Speed(rpm)
+T_6 = 9.55*E_6*I_6/N_1       // Torque(N-m)
+
+// Results
+disp("PART IV - EXAMPLE : 6.2 : SOLUTION :-")
+printf("\nSpeed-torque curve for motor")
+printf("\n_______________________________________")
+printf("\n Speed(rpm)         :      Torque(N-m)  ")
+printf("\n_______________________________________")
+printf("\n   %.f             :        %.f ", N_11,T_1)
+printf("\n   %.f              :        %.f ", N_2,T_2)
+printf("\n   %.f              :        %.f ", N_3,T_3)
+printf("\n   %.f              :        %.f ", N_4,T_4)
+printf("\n   %.f              :        %.f ", N_5,T_5)
+printf("\n   %.f              :        %.f ", N_6,T_6)
+printf("\n_______________________________________\n")
+printf("\nNOTE: ERROR: Calculation mistakes in the textbook solution")