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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD
+
+// CHAPTER : 4 : DIRECT CURRENT MACHINES 
+
+// EXAMPLE : 4.5
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+p = 4;              // Number of the Poles in the DC machine
+Nt = 100;           // Number of the turns in the Dc machine
+N = 600;            // Rotation speed of the DC machine in RPM
+E = 220;            // EMF generated in open circuit in Volts
+Z = 200;            // Total number of the Conductor in armature
+
+
+// CALCUALTIONS
+// For case (a) Lap Connected
+
+a = 4;                          // Number of the Poles in the DC machine
+n = N/60;                       // Revolution per second
+phi_a = (E*a)/(p*Z*n);          // Useful flux per pole when Armature is Lap connected in Weber
+
+// For case (b) Wave Connected
+
+a = 2;                          // Number of the Poles in the DC machine
+phi_b = (E*a)/(p*Z*n);          // Useful flux per pole when Armature is Wave connected in Weber
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 4.5 : SOLUTION :-") ;
+printf("\n (a) Useful flux per pole when Armature is Lap connected , phi = %.1f Wb  \n ",phi_a);
+printf("\n (B) Useful flux per pole when Armature is Lap connected , phi = %.3f Wb  \n ",phi_b);
+
+