Qt-21: Determine the air-fuel ratio and the theoretical amount of air required (mass basis) complete combustion of fuel containing 85% Carbon, 8% Hydrogen, 3\% Oxygen, 1% Sulphur and remaining as Ash. - If 40% excess air is used, what is the volume of air at 27C and 1.05bar pressure. - Also find out the air-fuel equivalence ratio. Ans: Theoretical Air: 12.55kg/kg of fuel Theoretical Air to Fuel Ratio: 12.55 (mass basis) Actual Air: 17.57kg/kg of fuel Actual Air: 14.407m3/kg of fuel at 27C and 1.05 bar pressure Air to Fuel Equivalence Ratio: 1.4 (mass basis)