initial commit / add all books

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diff --git a/695/CH3/EX3.11/Ex3_11.txt b/695/CH3/EX3.11/Ex3_11.txt
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+//Caption:Find the equivalent circuit parameters of the transformer reffered to LV side and also calculate the efficiency

+//Exa:3.11

+clc;

+clear;

+close;

+V1=200;//in volts

+I_o=0.8;//in amperes

+W_o=80;//in watts

+pf=W_o/(V1*I_o);

+I_w=I_o*pf;

+I_m=I_o*sqrt(1-pf^2);

+R_O=V1/I_w;

+X_O=V1/I_m;

+a=200/400;

+V_sc=25;//in volts

+I_sc=10;//in amperes

+P_sc=90;//in watts

+Z_O2=V_sc/I_sc;

+R_O2=P_sc/I_sc^2;

+X_O2=sqrt(Z_O2^2-R_O2^2);

+R_O1=a^2*R_O2;

+X_O1=a^2*X_O2;

+I_2=12;

+I_1=I_2/a;

+V2=sqrt((V1*pf+I_1*R_O1)^2+(V1*sqrt(1-pf^2)+I_1*X_O1)^2);

+P_iron=80;//in watts

+P_cu=(12/10)^2*90;

+P_total=P_cu+P_iron;

+Eff=6000*0.8/(6000*0.8+P_total);

+disp(R_O,'R_O (in ohms)=');

+disp(X_O,'X_O Magnetising reactance (in ohms)=');

+disp(R_O1,'Equivalent Resistance reffered to LV Side (in ohms)=');

+disp(X_O1,'Equivalent Reactance reffered to LV Side (in ohms)');

+disp(Eff*100,'Efficiency (in %)=')
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