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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD
+
+// CHAPTER : 4 : DIRECT CURRENT MACHINES 
+
+// EXAMPLE : 4.8
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+N = 800;                // Rotation speed of the Commutator in RPM
+D = 50;                // Diameter in Centimeter
+BW = 1.5;               // Brush Width in Centimeter
+
+
+// CALCULATIONS
+
+r = D/2;                   // Radius in Centimeter
+n = N/60;                  // Revoultion per second
+w = (2 * %pi)*n;           // Angular velocity 
+v = w*r;                   // Peripheral Speed in centimeter per second
+Tc = (BW/v)*1000;                 // Time of the Commutation in Second
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 4.8 : SOLUTION :-") ;
+printf("\n (a) Time of the Commutation , Tc = %.4f ms \n",Tc);