initial commit / add all books

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diff --git a/431/CH4/EX4.2/EX4_2.sce b/431/CH4/EX4.2/EX4_2.sce
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+//determining rotor running at high slip

+//Chapter 4

+//Example 4.2

+//page 288

+clear;

+clc;

+disp("example 4.2");

+f=50;   //frequency

+V=400; //voltage supply

+

+p=2;

+printf("when P=2, Syhchronous speed,Ns=%d \n",((120*f)/p));

+p=4;

+printf("when P=2, Syhchronous speed,Ns=%d \n",((120*f)/p));

+p=6;

+printf("when P=2, Syhchronous speed,Ns=%d \n",((120*f)/p));

+p=8;

+printf("when P=2, Syhchronous speed,Ns=%d \n",((120*f)/p));

+disp("for Nr to be 1440 , Ns will be 1500, thus p=4")

+Ns=1500;Nr1=1440;

+S1=((Ns-Nr1)/Ns)*100;

+printf("slip=%d\n",S1);

+disp("for Nr to be 940 , Ns will be 1000, thus p=6")

+Ns=1000;Nr2=940;

+S2=((Ns-Nr2)/Ns)*100;

+printf("slip=%d\n",S2);

+if S1>S2 then

+    disp("motor running at 1440 rpm is running at higher slip")

+elseif S2>S1

+    disp("motor running at 940 rpm is running at higher slip")
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diff --git a/431/CH4/EX4.2/resultEX4_2.txt b/431/CH4/EX4.2/resultEX4_2.txt
new file mode 100755
index 000000000..be975322a
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+++ b/431/CH4/EX4.2/resultEX4_2.txt
@@ -0,0 +1,14 @@
+ example 4.2   

+when P=2, Syhchronous speed,Ns=3000 

+when P=2, Syhchronous speed,Ns=1500 

+when P=2, Syhchronous speed,Ns=1000 

+when P=2, Syhchronous speed,Ns=750 

+ 

+ for Nr to be 1440 , Ns will be 1500, thus p=4   

+slip=4

+ 

+ for Nr to be 940 , Ns will be 1000, thus p=6   

+slip=6

+ 

+ motor running at 940 rpm is running at higher slip   

+ 
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