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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 4: DC Dynamo Torque Relations-DC Motors
+// Example 4-19
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+// From the calculations of Ex.4-16 , Ex.4-17 , Ex.4-18 we get no-load and
+// full-load speeds as follows
+S_n1 = 1810 ; // No-load speed in rpm (Ex.4-16)
+S_f1 = 1603 ; // Full-load speed in rpm (Ex.4-16)
+
+S_n2 = 1806 ; // No-load speed in rpm (Ex.4-17)
+S_f2 = 1231 ; // Full-load speed in rpm (Ex.4-17)
+
+S_n3 = 1311 ; // No-load speed in rpm (Ex.4-18)
+S_f3 = 505 ; // Full-load speed in rpm (Ex.4-18)
+
+// Calculations
+SR_1 = ( S_n1 - S_f1 ) / S_f1 * 100 ; // Speed regulation for shunt motor
+
+SR_2 = ( S_n2 - S_f2 ) / S_f2 * 100 ; // Speed regulation for compound motor
+
+SR_3 = ( S_n3 - S_f3 ) / S_f3 * 100 ; // Speed regulation for series motor
+
+// Display the results
+disp("Example 4-19 Solution : ");
+printf(" \n a: SR(shunt) = %.1f percent \n ", SR_1 );
+printf(" \n b: SR(compound) = %.1f percent \n ", SR_2 );
+printf(" \n c: SR(series) = %.1f percent \n ", SR_3 );