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+// Chapter 15 Example 2//
+clc
+clear
+//output voltage=e,ac output voltage =em,firing angle=a//
+a=20;// in degrees//
+e=400;// in kV//
+em=sqrt(2)*e/sqrt(3);
+vdo=3*sqrt(3)*em/%pi;
+printf("\n DC Output voltage = %.2f kV\n",vdo);
+//dc output voltage =vd,dc current=id,commutation resistance=rc//
+vd=500;// in kV//
+id=1;// in kA//
+// vd=vdo*cosd(a)-rc*id interchanging this we get//
+rc=(vdo*cosd(a)-vd)/id;
+printf("\n Effective commutation resistance = %.2f ohms\n",rc);
+\ No newline at end of file