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+////Chapter 13  Steam Engines
+////Example 13.2 Page No 283
+///Find Therotical mean effective pressure
+//Input data
+clc;
+clear;
+a=5/100;     //Engine cylinder of the stroke valume in %
+P1=12;       //Pressure of the stream
+rc=3;        //Cut-off is one-third
+Pb=1.1;      //Constant the back pressure in bar
+
+//Calulation
+//Therotical mean effective pressure Pm
+Pm=P1*(1/rc+((1/rc)+a)*log((1+a)/((1/rc)+a)))-Pb; 
+
+//Output
+printf('Therotical mean effective pressure=%f N/m^2 \n',Pm);