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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 12-11
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data (from Ex.12-10)
+V = 125 ; // Voltage rating of genrator in volt
+P_o = 12500 ; // Power rating of genrator in W
+P_hp = 20 ; // Power rating of motor in hp
+R_a = 0.1 ; // Armture resistance in ohm
+R_f = 62.5 ; // Field resistance in ohm
+P_var = 1040 ; // Rated variable electric loss in W
+
+// Calculated data from Ex.12-10
+P_k = 1380 ; // Constant losses in W
+
+// Calculations
+// Efficiency of the dc shunt generator
+// η = (output*L.F) / ( (output*L.F) + P_k + (L.F)^2 * P_a_rated ) * 100 
+output = P_o ;
+P_a_rated = P_var ;
+
+// case a
+LF1 = 25*(1/100); // At 25 % rated output
+// Efficiency of the dc shunt generator at 25 % rated output
+eta_1 = (output*LF1) / ( (output*LF1) + P_k + (LF1)^2 * P_a_rated ) * 100 ; 
+
+// case b
+LF2 = 50*(1/100); // At 50 % rated output
+// Efficiency of the dc shunt generator at 50 % rated output
+eta_2 = (output*LF2) / ( (output*LF2) + P_k + (LF2)^2 * P_a_rated ) * 100 ; 
+
+// case c
+LF3 = 75*(1/100); // At 75 % rated output
+// Efficiency of the dc shunt generator at 75 % rated output
+eta_3 = (output*LF3) / ( (output*LF3) + P_k + (LF3)^2 * P_a_rated ) * 100 ; 
+
+// case d
+LF4 = 125*(1/100); // At 125 % rated output
+// Efficiency of the dc shunt generator at 125 % rated output
+eta_4 = (output*LF4) / ( (output*LF4) + P_k + (LF4)^2 * P_a_rated ) * 100 ; 
+
+
+// Display the results
+disp("Example 12-11 Solution : ");
+
+printf(" \n a: η at %.2f rated output = %.2f percent \n ",LF1,eta_1);
+
+printf(" \n b: η at %.2f rated output = %.2f percent \n ",LF2,eta_2);
+printf(" \n    Please note: Calculation error for case b: η in the textbook.\n");
+
+printf(" \n c: η at %.2f rated output = %.2f percent \n ",LF3,eta_3);
+
+printf(" \n d: η at %.2f rated output = %.2f percent \n ",LF4,eta_4);