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diff --git a/431/CH5/EX5.11/EX5_11.sce b/431/CH5/EX5.11/EX5_11.sce
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+//chapter 5
+//example 5.11
+//page 441
+clear;
+clc;
+disp("example 5.11");
+printf("\n");
+disp("field exitation current=10A");
+V_oc=900;      //induced emf on open circuit
+I_sc=150;      //short circuit current
+Z_s=V_oc/I_sc; //synchronous impedence
+printf("synchronous impedence,Z_s= %d ohm\n",Z_s);
+I_a=60;
+printf("internal voltage drop when the load current is 60amp=  %d V",(I_a*Z_s));
+\ No newline at end of file