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diff --git a/431/CH2/EX2.16/EX2_16.sce b/431/CH2/EX2.16/EX2_16.sce
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+//calculate approximate time of commmutation
+//Chapter 2
+//Example 2.16
+//page 103
+clear;
+clc; 
+disp("Example 2.16")
+Cd=0.76;            //commutator diameter in metres
+Cr=.38;              //commutator radius in metres
+bw=1.5*10^(-2);        //brush width in metres
+N=600;                //speed in rpm
+n=10;                //speed in rps
+V=Cr*(2*3.14*n);        
+printf("peripheral speed of commutator,V=%fm/sec",V);
+ Tc=bw/V;
+ printf("\nTime of commutation=%fseconds",Tc)
+ 
+ 
+ 
+ 
+ 
+ 
+\ No newline at end of file