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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 12: POWER,ENERGY,AND EFFICIENCY RELATIONS OF DC AND AC DYNAMOS
+// Example 12-2
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+// data from Ex.12-1
+P = 10000 ; // Power rating of the shunt generator in W
+V = 230 ;// Voltage rating of the shunt generator in volt
+S = 1750 ; // Speed in rpm of the shunt generator
+
+// ( Solutions from Example 12-1 )
+Rotational_losses = 489.2 // Rotational losses at full load in W
+armature_loss = 396 ; // Full-load armature loss in W
+field_loss = 230 ; // Full-load field loss in W
+
+// case a
+x1 = (1/4); // Fraction of full-load
+// Subscript a for eta indicates case a
+eta_a = (P*x1) / ( (P*x1) + Rotational_losses + (armature_loss*(x1^2)+field_loss) ) * 100 ; 
+
+// case b
+x2 = (1/2); // Fraction of full-load
+// Subscript b for eta indicates case b
+eta_b = (P*x2) / ( (P*x2) + Rotational_losses + (armature_loss*(x2^2)+field_loss) ) * 100 ; 
+
+// case c
+x3 = (3/4); // Fraction of full-load
+// Subscript c for eta indicates case c
+eta_c = (P*x3) / ( (P*x3) + Rotational_losses + (armature_loss*(x3^2)+field_loss) ) * 100 ; 
+
+// case d
+x4 = (5/4); // Fraction of full-load
+// Subscript d for eta indicates case d
+eta_d = (P*x4) / ( (P*x4) + Rotational_losses + (armature_loss*(x4^2)+field_loss) ) * 100 ; 
+
+// Display the results
+disp("Example 12-2 Solution : ");
+
+printf(" \n    If x is the fraction of full-load, then \n ");
+printf(" \n a: Efficiency of generator when x = %.2f ",x1 );
+printf(" \n    η = %.1f percent \n ",eta_a);
+
+printf(" \n b: Efficiency of generator when x = %.2f ",x2 );
+printf(" \n    η = %.1f percent \n ",eta_b);
+
+printf(" \n c: Efficiency of generator when x = %.2f ",x3 );
+printf(" \n    η = %.1f percent \n ",eta_c);
+
+printf(" \n d: Efficiency of generator when x = %.2f ",x4 );
+printf(" \n    η = %.1f percent \n ",eta_d);