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+// Example 9.11
+// Determine (a) Equivalent armature resistance (b) Synchronous reactance 
+// (c) Short-circuit ratio
+// Page 377
+
+clc;
+clear;
+close;
+
+// Given data
+Vdc=10.35;                 // DC voltage
+Idc=52.80;                 // DC current
+VOCph=240/sqrt(3);         // Open-circuit phase voltage
+ISCph=115.65;              // Short-circuit phase current
+P=50000;  
+V=240;                     // Supply voltage
+
+// (a) Equivalent armature resistance
+Rdc=Vdc/Idc;               // DC resistance
+Rgamma=Rdc/2;
+Ra=1.2*Rgamma;             // Armature resistance
+
+// (b) Synchronous reactance 
+Zs= VOCph/ISCph;          // Synchronous impedance/phase
+Xs=sqrt(Zs^2-Ra^2);
+
+// (c) Short-circuit ratio
+Sbase=P/3;                // Power/phase
+Vbase=V/sqrt(3);          // Voltage/phase
+Zbase=Vbase^2/Sbase;
+Xpu=Xs/Zbase;             // Per unit synchronous reactance
+SCR=1/Xpu;                // Short-circuit ratio
+
+
+// Display result on command window
+printf("\n Equivalent armature resistance = %0.4f Ohm ",Ra);
+printf("\n Synchronous reactance = %0.4f Ohm ",Xs);
+printf("\n Short-circuit ratio = %0.3f ",SCR);
+