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//Book Name:Fundamentals of Electrical Engineering
//Author:Rajendra Prasad
//Publisher: PHI Learning Private Limited
//Edition:Third ,2014
//Ex7_6.sce.
clc;
clear;
//the given data are taken from previous example(Ex7_5)
Vp=6600; //primary voltage in V
Vs=440; //secondary voltage in V
rp=0.45; //primary winding resistance in ohms
rs=0.0015; //secondary winding resistance in ohms
Wi=2.9e3; //iron loss in watt
pf=0.8; //power factor lagging
Re=rp+(Vp/Vs)^2*rs; //equivalent resistance referred to primary
Ip=sqrt(Wi/Re);
P_max=Vp*Ip*pf;
total_loss=2*Wi;
Max_efficiency=(P_max/(P_max+total_loss))*100;
printf("\n Maximum Efficiency=%2.2f percentage \n",Max_efficiency)
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