initial commit / add all books

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diff --git a/3760/CH4/EX4.43/Ex4_43.sce b/3760/CH4/EX4.43/Ex4_43.sce
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+clc;

+v=230; // rated voltage of dc shunt motor

+n1=900; // speed at which motor is running 

+ia1=2; // armature current at n=900 rpm

+ra=0.5; // armature resistance

+ia2=20; // armature current at rated load and rated voltage

+Ea=v-ia1*ra; // counter EMF at no load

+k=(Ea*60)/(2*%pi*n1); // constant term used for calculating back EMF

+disp('case a');

+rs=2; // resistance in series with armature

+rp=3; // resistace in parallel with series combination of rs and ra

+A=rp/(rp+rs);

+wmo=(1/k)*(A*v-ia1*(A*rs+ra)); // no-load speed

+wml=(1/k)*(A*v-ia2*(A*rs+ra)); // full-load speed

+sr=((wmo-wml)/wml)*100; // percent speed regulation

+printf('Speed regulation for first case is %f percent\n',sr);

+disp('case b');

+rs=3; // resistance in series with armature

+wmo=(1/k)*(v-ia1*(rs+ra)); // no-load speed

+wml=(1/k)*(v-ia2*(rs+ra)); // full-load speed

+sr=((wmo-wml)/wml)*100; // percent speed regulation

+printf('Speed regulation for second case is %f percent\n',sr);