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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 7: PARALLEL OPERATION
+// Example 7-5
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+E_1 = 220 ; // Terminal voltage of alternator 1 in volt 
+E_2 = 222 ; // Terminal voltage of alternator 2 in volt 
+f_1 = 60 ; // Frequency of alternator 1 in Hz
+f_2 = 59.5 ; // Frequency of alternator 2 in Hz
+// Switch is open
+
+// Calculations
+// case a
+E_max = (E_1 + E_2)/2 ; // Maximum effective voltage across each lamp in volt 
+E_min = (E_2 - E_1)/2 ; // Minimum effective voltage across each lamp in volt 
+
+// case b
+f = f_1 - f_2 ; // Frequency in Hz of the voltage across the lamps
+
+// case c
+E_peak = E_max / 0.7071 ; // Peak value of the voltage in volt across each lamp
+
+// case d
+n = (1/2)*f_1 ; // Number of maximum light pulsations per minute
+
+// Display the results
+disp("Example 7-5 Solution : ");
+printf(" \n a: E_max/lamp = %d V (rms)\n ", E_max );
+printf(" \n    E_min/lamp = %d V \n ", E_min );
+printf(" \n b: f = %.1f Hz \n ", f );
+printf(" \n c: E_peak = %.f V \n ", E_peak );
+printf(" \n d: n = %d pulsations/min ", n );