initial commit / add all books

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diff --git a/431/CH3/EX3.26/EX3_26.sce b/431/CH3/EX3.26/EX3_26.sce
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+//Calculate efficiency of transformer //Chapter 3

+//Example 3.26

+//page 234

+clear;

+clc;

+disp("Example 3.26")

+kVA=400;                    //rating of the transformer

+ironloss=2;                //iron loss in kilowatt

+pf=0.8;                     //power factor

+kW=240;                    //load in kilowatt

+kVA1=kW/pf;

+disp("Efficiency is maximium when,core-loss=copper-loss")

+coreloss=ironloss;

+disp("Maximium efficiency occurs at 240kw,0.8 power factor,i.e., at 300kVA load")

+Cl300=coreloss;

+Cl400=(Cl300*(kVA/kVA1)^2);

+pf1=0.71;            //power factor for full load

+effi=(kVA*pf1*100)/((kVA*pf1)+coreloss+Cl400);

+printf("\nEfficiency at full-load and 071 power factor=%dpercent",effi);

+pf2=1                    //maximium efficiency occurs at unity power factor

+MAXeffi=(kVA1*pf2*100)/((kVA1*pf2)+coreloss+Cl300)

+printf("\nMaximium efficiency at 300kVA and unity power factor=%fpercent",MAXeffi);

+

diff --git a/431/CH3/EX3.26/resultEX3_26.txt b/431/CH3/EX3.26/resultEX3_26.txt
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+ Example 3.26   

+ 

+ Efficiency is maximium when,core-loss=copper-loss   

+ 

+ Maximium efficiency occurs at 240kw,0.8 power factor,i.e., at 300kVA load   

+

+Efficiency at full-load and 071 power factor=98percent

+Maximium efficiency at 300kVA and unity power factor=98.684211percent 
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