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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD
+
+// CHAPTER : 7 : SPECIAL MOTORS AND INTRODUCTION TO GENERALIZED MACHINE THEORY
+
+// EXAMPLE : 7.5
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+R = 15;                                             // Resistance of the fractional horse power AC series motor in Ohms
+V = 230;                                            // AC supply voltage in Volts
+f = 50;                                             // Frequency in Hertz
+I = 1.2;                                            // Motor current in Amphere
+NDC = 2500;                                         // Rotating speed of the Motor during DC Operation in RPM
+L = 0.5;                                            // Total inductance in Henry
+
+
+// CALCUALTIONS
+
+X = 2*%pi*f*L;                                                  // Reactance in Ohms
+NAC = NDC * (sqrt(V^2-(I*X)^2)-(I*R)) / (V-(I*R));              // Rotating speed of the Motor during AC Operation in RPM
+pf = sqrt(1-((I*X)/V)^2);                                       // Power factor lagging
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 7.5: SOLUTION :-");
+printf("\n When the Motor operting at AC 230V, 50 Hz \n\n (a) NAC = %.f RPM \n",NAC)
+printf("\n (b) Power factor = %.4f lagging \n",pf)