initial commit / add all books

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diff --git a/431/CH4/EX4.30/EX4_30.sce b/431/CH4/EX4.30/EX4_30.sce
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+//Calculate full load rotor loss and rotor input and output torque

+//Chapter 4

+//Example 4.30

+//page 345

+clear;

+clc; 

+disp("Example 4.30")

+hp=20;                    //power in horsepower

+f=50;                    //frequency in hertz

+P=4;                    //number of poles

+Ns=(120*f)/P;                //synchronous speed

+printf("Synchronous speed,Ns=%drpm",Ns);

+S=0.04;                            //slip

+Nr=Ns*(1-S);

+OP=hp*735.5;

+printf("\nOutput power=%fW",OP);

+OT=OP/(2*3.14*(Nr/60));

+printf("\nOutput torque=%fNm",OT);

+FL=0.02*OP;          //Friction and windage loss

+PD=OP+FL;

+printf("\nPower developed by the rotor=%fW",PD);

+//from relation, (rotor I^2R-loss=S*Rotor input) we get following relation 

+RL=(S*PD)/(1-S);        

+printf("\nRotor I^2R-loss=%fW",RL);

+RI=RL/S;

+printf("\nRotor input=%dW",RI)

+