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+clc;funcprot(0);//EXAMPLE 11.5
+// Initialisation of Variables
+afr=15;.....................//Air fuel ratio
+p1=1;.........................//Atmospheric pressure in bar
+p2=0.8;.......................//Pressure at venturi throat in bar
+pd=30;....................//Pressure drop to air cleaner in mm of Hg
+rhohg=13600;....................//Density of Hg in kg/m^3
+af=240;........................//Air flow at sea level in kg/h
+g=9.81;.....................//Acceleration due to gravity in m/s^2
+//calculations
+delpa=p1-p2;........................//When there is no air cleaner
+pt=1-(rhohg*g*(pd/1000)*10^(-5))-delpa;..........................//Throat pressure in bar
+disp(pt,"Throat pressure (in bar):")
+afrn=afr*sqrt(delpa/(p1-pt));...............................//Air fuel ratio when the air cleaner is fitted
+disp(afrn,"Air fuel ratio when the air cleaner is fitted:")
+