initial commit / add all books

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diff --git a/83/CH4/EX4.1/example_4_1.sce b/83/CH4/EX4.1/example_4_1.sce
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+//Chapter 4
+//Example 4.1
+//page 103
+// to draw the per unit reactance diagram
+clear;clc;
+mvab=30; kvb=33; //MVA base and KVA base are selected
+
+gen1_mva=30; gen1_kv=10.5; gen1_x=1.6;  //Generator No.1 details
+gen2_mva=15; gen2_kv=6.6; gen2_x=1.2;  //Generator No.2 details
+gen3_mva=25; gen3_kv=6.6; gen3_x=0.56;  //Generator No.3 details
+
+t1_mva=15; t1_hv=33; t1_lv=11; t1_x=15.2; //Transformer T1 details
+t2_mva=15; t2_hv=33; t2_lv=6.2; t2_x=16; //Transformer T1 details
+
+tl_x=20.5; //Transmission line recatance
+
+//Loads are neglected as said in the problem
+
+tl_pu=(tl_x*mvab)/kvb^2;
+t1_pu=(t1_x*mvab)/kvb^2;
+t2_pu=(t2_x*mvab)/kvb^2;
+gen1_kv_base=t1_lv;
+gen1_pu=(gen1_x*mvab)/gen1_kv_base^2;
+gen2_kv_base=t2_lv;
+gen2_pu=(gen2_x*mvab)/gen2_kv_base^2;
+gen3_pu=(gen3_x*mvab)/gen2_kv_base^2;
+
+//diplaying the results on console
+
+printf('Per unit impedance of the components of the given power system are as follows :\n\n');
+
+printf('Transmission line: %0.3f \n\n',tl_pu);
+
+printf('Transformer T1: %0.3f \n\n',t1_pu);
+
+printf('Transformer T2: %0.3f \n\n',t2_pu);
+
+printf('Generator 1: %0.3f \n\n',gen1_pu);
+
+printf('Generator 2: %0.3f \n\n',gen2_pu);
+
+printf('Generator 3: %0.3f \n\n',gen3_pu);
+
diff --git a/83/CH4/EX4.1/result_example_4_1.txt b/83/CH4/EX4.1/result_example_4_1.txt
new file mode 100755
index 000000000..975ce31a8
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+ 
+Per unit impedance of the components of the given power system are as follows :
+
+Transmission line: 0.565 
+
+Transformer T1: 0.419 
+
+Transformer T2: 0.441 
+
+Generator 1: 0.397 
+
+Generator 2: 0.937 
+
+Generator 3: 0.437 
+
+ 
+ Execution done.   
+