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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 3 : TRANSFORMER AND PER UNIT SYSTEM
+// Example : 3.13
+
+clc;clear; // clears the console and command history 
+
+// Given data
+kVA = 120               // kVA ratings of autotransformer
+V1 = 2200               // lower part voltage of autotransformer in V
+V2 = 220                // upper part voltage of autotransformer in V
+
+// caclulations 
+I_pq = kVA*10^3/V2     // currents of respective windings
+I_qr = kVA*10^3/V1     // currents of respective windings
+I_1 = I_pq+I_qr        // current in primary side in A
+V_2 = V1+V2            // voltage across the secondary side in V
+kVA_1 = I_1*V1/1000    // kVA ratings of autotrnsformer
+kVA_2 = I_pq*V_2/1000  // kVA ratings of autotrnsformer
+ 
+
+// display the result 
+disp("Example 3.13 solution");
+printf(" \n kVA ratings of autotrnsformer \n kVA_1 = %.0f kVA \n", kVA_1);
+printf(" \n kVA ratings of autotrnsformer \n kVA_2 = %.0f kVA \n", kVA_2);
+