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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 9: POLYPHASE INDUCTION (ASYNCHRONOUS) DYNAMOS
+// Example 9-3
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+P = 4 ; // Number of poles in Induction motor
+f = 60 ; // Frequency in Hz 
+s_f = 5*(1/100) ; // Full-load rotor slip
+
+// Calculations
+
+// case a
+// slip, s = (S -S_r)/S ; 
+// where S = Speed in rpm of the rotating magnetic field and 
+//       S_r = Speed in rpm of the rotor
+s = 1 ; // Slip = 1, at the instant of starting, since S_r is zero
+f_r_a = s * f ; // Rotor frequency in Hz at the instant of starting
+
+// case b
+f_r_b = s_f * f ;// Full-load rotor frequency in Hz
+
+// Display the results
+disp("Example 9-3 Solution : ");
+
+printf(" \n a: At the instant of starting, slip s = (S -S_r)/S ; ");
+printf(" \n    where S_r is the rotor speed. Since the rotor speed at the ");
+printf(" \n    instant of starting is zero, s = (S - 0)/S = 1 , or unity slip.");
+printf(" \n\n    The rotor frequency is \n    f_r  = %d Hz \n\n ", f_r_a);
+
+printf(" \n b: At full-load,the slip is 5 percent(as given), and therefore");
+printf(" \n    s = %.2f \n    f_r = %d Hz " , s_f , f_r_b);