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+
+
+                   // Examle 15.4
+
+p=4;                       // No.Of poles
+f=50;                      // Frequency
+Ns=(120*f)/p;              // Synchronous speed
+disp(' The Synchronous Speed (Ns) = '+string(Ns)+' rpm');
+
+s1=0.04;                   // Slip
+N1=Ns*(1-s1);              // The Speed of Rotor
+disp('(b) The Speed of Rotor (at s=0.04) = '+string(N1)+' rpm');
+
+N=600;                     // Speed Of rotation
+s=(Ns-N)/Ns;               // When speed is (600 rmp) Then Slip
+fr=s*f;                    // The Frequence of Rotor (fr)
+disp('(d) The Frequence of Rotor (fr) = '+string(fr)+' Hz');
+
+
+
+
+             //  p 594        15.4
+
+
+