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+// Example 7.1
+// Determine (a) Torque load on the shaft (b) Torque angle if the voltage 
+// drops to 224V (c) Will the rotor pull out of synchronism?
+// Page No. 282
+
+clc;
+clear;
+close;
+
+// Given data
+f=60;                 // Frequency
+P=4;                  // Number of poles
+Pshaft=10;            // Shaft power in hp
+V1=240;               // Rated voltage
+V2=224;               // New voltage
+phirel1=30;           // Torque angle
+
+
+// (a) Torque load on the shaft
+ns=120*f/P;            // speed of machine
+Trel=Pshaft*5252/ns;
+
+
+// (b) Torque angle if the voltage drops to 224V
+phirel2=asind((V1^2/V2^2)*sind(2*phirel1))/2
+
+// Display result on command window
+printf("\n Torque load on the shaft = %0.2f  lb-ft ",Trel);
+printf("\n Torque angle if the voltage drops to 224V = %0.2f deg ",phirel2);
+printf("\n Because torque angle is less than 45 degree, \n the rotor will not pull out of synchronism ")
+