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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD 
+
+// CHAPTER : 4 : DIRECT CURRENT MACHINES 
+
+// EXAMPLE : 4.19
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+Vac = 250;                  // Operating AC Voltage in Volts
+V = 220;                    // Operating Voltage of the separately excited DC motor in Volts
+fa = 30;                    // Firing Angle in Degree
+Out_hp = 20;                // DC Motor Output in HP
+La = 20 * 10 ^ -3;          // Armature Inducatnce in Henry
+Ra = 0.15;                  // Armature Resistance in Ohms
+E_cons = 0.2;               // EMF Constant in Volts/RPM
+eta = 90/100;               // Motor Operating Efficiency
+N = 1000;                   // Rotational Speed of the Motor in RPM
+
+
+// CALCULATIONS
+
+out = 20 * 746;                         // DC Motor Output in Watt
+Vt = ((Vac*2*sqrt(2))/%pi)*cosd(fa);    // Average Terminal volatge in Volts
+Ia = out/(V*eta);                       // Rated Current in Amphere
+E = Vt - ( Ia * Ra );                   // Back EMF in Volts
+n = E/E_cons;                           // Speed of the Motor in RPM
+e_cons = (E_cons*60)/ ( 2 * %pi);       // EMF Constant in Volts-Second per radians
+T = e_cons * Ia;                        // Devolped Torque in Newton-Meter
+pi = (E*Ia)+(Ia^2*Ra);                  // Power intake in Watts
+pi_v = Vt * Ia;                         // Power intake in Watts (Verification)
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 4.19 : SOLUTION :-") ;
+printf("\n (a) Speed of the Motor, N = %.2f RPM \n",n);
+printf("\n (b) Devolped Torque, T = %.2f N-m \n",T);
+printf("\n (b) Power intake at Rated current and Firing angle of %.f deg, VI = %.1f W \n",fa,pi);
+printf("\n\n    [ TEXT BOOK SOLUTION IS PRINTED WRONGLY ( I verified by manual calculation )]\n" );
+printf("\n      WRONGLY PRINTED ANSWERS IS :- (a) T = 114.07 N-m instead of 143.91 N-m \n" );
+
+
+
+
+