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+clc;
+vdr=2; // percentage full load voltage drop in resistance
+vdx=4; // percentage full load voltage drop in leakage reactance
+// full load ohmic losses are equal to 0.02*VA rating of transformer which is equal to iron losses
+n=100/(1+(vdr/100)+(vdr/100));
+printf('Efficiency on full load at unity p.f is %f percent\n',n);
+// maximum voltage drop means voltage regulation is also maximum
+pf=vdr/sqrt(vdr^2+vdx^2);
+printf('Full load power factor at which voltage regulation is maximum is %f lagging\n',pf);
+pf=vdx/sqrt(vdr^2+vdx^2);
+printf(' load power factor at which voltage regulation is zero is %f leading',pf);