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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 13: RATINGS,SELECTION,AND MAINTENANCE OF ELECTRIC MACHINERY
+// Example 13-8
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+V = 120 ; // Rated output voltage in volt of separately excited dc generator
+I = 100 ; // Rated output current in A of separately excited dc generator
+R = 0.1 ; // Armature resistance in ohm
+
+// Calculations
+// case a
+V_b = V ; // base voltage in volt
+
+// case b
+I_b = I ; // base current in A
+
+// case c
+R_b = V_b / I_b ; // base resistance in ohm
+
+// case d
+R_pu = R / R_b ; // per-unit value of armature resistance in p.u
+
+// Display the results
+disp("Example 13-8 Solution : ");
+
+printf(" \n a: Base voltage \n    V_b = %d V \n ", V_b );
+
+printf(" \n b: Base current \n    I_b = %d A \n ", I_b );
+
+printf(" \n c: Base resistance \n    R_b = %.1f ohm \n ", R_b );
+
+printf(" \n d: Per-unit value of armature resistance\n    R_p.u = %.3f p.u \n ", R_pu );