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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD 
+
+// CHAPTER : 4 : DIRECT CURRENT MACHINES 
+
+// EXAMPLE : 4.22
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+N1 = 1000;                  // Speed of the DC shunt Motor in RPM
+Out_hp = 20;                // Output of the DC shunt Motor in HP
+V = 220;                    // Motor operating Volatge in Volts
+Ra = 0.9;                   // Armature Resistance in Ohms
+Rf = 200;                   // Field Resistance in Ohms
+eta = 89/100;               // Operating Efficiency of the Motor 
+Ra_a = 0.2;                 // Resistance inserted to the armature circuit
+
+
+// CALCULATIONS
+
+out = Out_hp * 746;                 // Output of the DC Motor in watts
+I =  out/(V * eta);                 // Rated current in Amphere
+If = V/Rf;                          // Field current in Amphere
+Ia1 = I - If;                       // Armature current in Amphere
+E1 = V - (Ia1 * Ra);                // Back EMF in Volts
+// Assuming that Torque and Armature current is constant
+E2 = V - ( Ra + Ra_a ) * Ia1;       // New Back EMF in Volts 
+N2 = N1*(E2/E1);                    // New speed in RPM
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 4.22: SOLUTION :-") ;
+printf("\n (a) New Speed of the Motor , N2 = %.2f RPM \n",N2);