initial commit / add all books

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diff --git a/431/CH4/EX4.15/EX4_15.sce b/431/CH4/EX4.15/EX4_15.sce
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+//Calculating new full load speed

+//Chapter 4

+//Example 4.15

+//page 310

+clear;

+clc; 

+disp("Example 4.15")

+f=50;.....................//frequency of induction motor in hertz

+P=4;                        //number of poles

+Nr=1440;                    //rotor speed in rpm

+R2=0.1;                    //rotor resistance in ohms

+X20=0.6;                    //rotor standstill resistance in ohms

+Ns=(120*f)/P;

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

+S1=(Ns-Nr)*(100/Ns);

+printf("Full-load slip with rotor resistance,R2 i.e. S1=%f",S1);

+disp("on adding extra resistance o.1ohm")

+//on solving we get S2=0.08

+S2=0.08;

+Nr2=Ns*(1-S2);

+printf("\nNew rotor speed=%drpm",Nr2);

+

diff --git a/431/CH4/EX4.15/resultEX4_15.txt b/431/CH4/EX4.15/resultEX4_15.txt
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+  

+ Example 4.15   

+Synchronous speed=1500rpmFull-load slip with rotor resistance,R2 i.e. S1=4.000000 

+ on adding extra resistance o.1ohm   

+

+New rotor speed=1380rpm
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