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+clc;funcprot(0);//EXAMPLE 17.24

+// Initialisation of Variables

+v1=0.216;.....................//Gas consumption in m^3/min

+pw=75;........................//Pressure of gas in mm of water

+t1=290;......................//Temperature of gas in K

+ac=2.84;....................//Air consumption in kg/min

+br=745;......................//Barometer reading in m of Hg

+D=0.25;.....................//Engine bore in m

+L=0.475;......................//Engine stroke in m

+N=240;........................//Engine rpm

+R=287;......................//Gas constant for air in J/kgK

+//Calculations

+p1=br+(pw/13.6);...................//Pressure of gas in mm of mercury

+p2=760;t2=273;.....................//NTP conditions in mm of Hg and Kelvin

+v2=(p1*v1*t2)/(t1*p2);...............//Volume of gas used at NTP in m^3

+gs=v2/(N/2);.........................//Gas used per stroke in m^3

+v=(ac*R*t2)/(1.0132*10^5);...........//Volume occupied by air at NTP in m^3/min

+aps=v/(N/2);...........................//Air used per stroke

+Va=gs+aps;.....................//Actual volume of mixture in m^3 drawn per stroke at NTP

+Vs=(%pi/4)*D*D*L;...............//Swept volume in mm^3

+etaV=(Va/Vs);...................//Volumetric efficiency

+disp(etaV*100,"Volumetric efficiency (in %):")