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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 9: POLYPHASE INDUCTION (ASYNCHRONOUS) DYNAMOS
+// Example 9-4
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+P = 4 ; // Number of poles in the IM
+hp = 50 ; // rating of the IM in hp
+V_o = 208 ; // Voltage rating of the IM in volt
+T_orig = 225 ; // Starting torque in lb-ft
+I_orig = 700 ; // Instantaneous startign current in A at rated voltage
+V_s = 120 ; // Reduced 3-phase voltage supplied in volt
+
+// Calculations
+// case a
+T_s = T_orig * (V_s/V_o)^2 ; // Starting torque in lb-ft after application of V_s
+
+// case b
+I_s = I_orig * (V_s/V_o) ; // Starting current in A after application of V_s
+
+// Display the results
+disp("Example 9-4 Solution : ");
+printf(" \n a: Starting torque :\n    T_s = %.f lb-ft \n",T_s );
+
+printf(" \n b: Starting current :\n    I_s = %d A \n",I_s );