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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 7 : THREE-PHASE INDUCTION MOTOR
+// Example : 7.5
+
+clc;clear; // clears the console and command history 
+
+// Given data
+V = 440     // supply voltage in V
+P = 4       // number of poles
+P_ag = 1500 // rotor i/p in kW
+P_rcu = 250 // copper loss in W
+f = 50      // frequency in Hz
+
+// caclulations 
+s = P_rcu/P_ag       // slip
+N_s = 120*f/P        // synchronous speed in rpm
+N_l = (1-s)*N_s      // rotor maximum speed in rpm
+P_mech = (1-s)*P_ag  // mechanical power developed in W
+
+// display the result 
+disp("Example 7.5 solution");
+printf(" \n Slip \n s = %.3f \n", s);
+printf(" \n Synchronous speed \n N_s = %.f rpm \n", N_s);
+printf(" \n Rotor speed \n N_l = %.0f rpm \n", N_l);
+printf(" \n Mecahnical power developed \n P_mech = %.0f W \n", P_mech);
+
+// NOTE : small change in answer instead 1245 got 1250W