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+////Chapter 13  Steam Engines
+////Example 13.11 Page No 290
+///Find Actual mean effective pressure
+//Input data
+clc;
+clear;
+D=240*10^-3;  //Steam engine bor
+L=300*10^-3;  //Stroke of engine
+N=220;         //Speed of engine 220 in rpm      
+IP=36;         //Indicated power in Kw
+Pb=1.3;        //Exhaust pressure in bar
+re=2.5;        //Expansion ratio
+K=0.8;         //Diagram factor
+pi=3.142
+A=((pi/4)*(D^2));
+
+
+
+//Calculation
+Pma=((IP*60000)/(2*10^5*L*A*N));  //Indicated power of steam engine in bar
+Pm=Pma/K;                          //Actual mean effective pressure in bar
+P1=((Pm+Pb)*re)/(1+log(re));  //Theoretical mean effective pressure in bar
+
+//Output
+printf('Indicated power of steam engine= %f bar \n',Pma);
+printf('Actual mean effective pressure= %f bar \n',Pm);
+printf('theoretical mean effective pressure= %f bar \n',P1);