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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 7: PARALLEL OPERATION
+// Example 7-6
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+E = 220 ; // Voltage generated in volt
+E_1 = E ; // Voltage generated by alternator 1 in volt
+E_2 = E ; // Voltage generated by alternator 2 in volt
+f_1 = 60 ; // Frequency in Hz of alternator 1
+f_2 = 58 ; // Frequency in Hz of alternator 2
+// Switch is open
+
+// Calculations
+// case a
+E_max = (E_1 + E_2)/2 ; // Maximum effective voltage across each lamp in volt
+f = f_1 - f_2 ; // Frequency in Hz of the voltage across the lamps
+
+// case c
+E_min = (E_2 - E_1)/2 ; // Minimum effective voltage across each lamp in volt 
+
+// Display the results
+disp("Example 7-6 Solution : ");
+printf(" \n a: E_max/lamp = %d V \n    f = %d Hz \n ", E_max, f );
+printf(" \n b: The voltages are equal and opposite in the local circuit. \n ");
+printf(" \n c: E_min/lamp = %d V at zero frequency \n ", E_min );
+printf(" \n d: The voltages are in phase in the local circuit. ");