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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD 
+
+// CHAPTER : 3 : TRANSFORMERS 
+
+// EXAMPLE : 3.5
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+Ai = 2.3 * 10 ^ -3;                 // Cross-Sectional area of the core in Meter-Square
+mue_0 = 4*%pi*10^ -7;               // Permeability of the air in Henry/Meter
+Fe_loss = 2.6;                      // Iron loss at the working Flux density Watts/kg
+Fe_den = 7.8 * 10 ^ 3;              // Density of the Iron in kg/Meter-Cube
+N1 = 800;                           // Number of Turns of the Primary winding
+L = 2.5;                            // Length of the Flux path in Meter
+mue_r = 1000;                       // Relative Permeability
+E = 400;                            // Primary Volatge of the Transformer in Volts
+f = 50;                             // Frequency in Hertz
+
+
+// CALCULATIONS
+
+Bm = E/(4.44*f*Ai*800);             // Flux Density in Weber/Meter-Square
+phi_m = (Bm*Ai)*10^3;               // Maximum Flux in the core in milli-Weber
+F = (L*Bm)/(mue_r*mue_0);           // Magnetizing MMF in Amphere-turns
+Im = F/(N1*sqrt(2));                // Magnetizing Current in Amphere
+Vol = L*Ai;                         // Volume of the Core in Meter-Cube
+W = Vol * Fe_den;                   // Weight of the Core in kg
+Total_Fe_loss = Fe_loss * W;        // Total Iron loss in Watt
+Ic = Total_Fe_loss/E;               // Loss component of Current in Amphere
+Io= sqrt((Ic ^ 2)+(Im ^ 2));        // No load Current in Amphere
+pf_angle = atand(Io/Ic);            // No load Power factor angle in degree
+pf = cosd(pf_angle);                // No load Power factor 
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 3.5 : SOLUTION :-") ;
+printf("\n (a) Maximum Flux in the core , phi_m = %.6f mWb \n ",phi_m);
+printf("\n (b) No load Current , I0 = %.3f A \n",Io);
+printf("\n (c) No load Power factor angle  =  %.3f degree \n ",pf_angle);
+printf("\n (d) No load Power factor =  %.4f \n ",pf);