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Multiple Choice Quiz
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1
Five kilogram-mol of octane are burned with a stiochiometric amount of air. How much water is formed in the products if the combustion is complete?
A)15 kg-mol
B)25 kg-mol
C)35 kg-mol
D)45 kg-mol
2
Methyl alcohol is burned with 30% excess air. How much unburned oxygen will there be in the products if the combustion is complete?
A)0.35 kg-mol-O2/kg-mol-fuel
B)0.45 kg-mol-o2/kg-mol-fuel
C)0.55 kg-mol-o2/kg-mol-fuel
D)0.65 kg-mol-o2/kg-mol-fuel
3
Gaseous methane fuel is burned with 100% excess air. This combustion is incomplete with 10% of the carbon in the fuel forming CO. The products of combustion are at 100 kPa. What is the partial pressure of the CO in the products?
A)0.51 kPa
B)1.36 kPa
C)2.78 kPa
D)10.5 kPa
4
Gaseous methane fuel is burned with 50% excess air. When the temperature of the products is 30°C and the pressure is 100 kPa, what fraction of the water in the products is liquid?
A)31%
B)48%
C)62%
D)74%
5
Dodecane is burned at constant pressure with 150% excess air. What is the air-fuel ratio for this process?
A)37.5
B)42.3
C)48.7
D)51.3
6
Liquid octane fuel is burned in an isobaric, steady-flow burner with 80% excess air. The air and fuel enter the burner at 25°C and the combustion products leave at 427°C. How much heat is released by this burner when the combustion is complete?
A)18,530 kJ/kg-fuel
B)31,800 kJ/kg-fuel
C)38,460 kJ/kg-fuel
D)42,610 kJ/kg-fuel
7
One gallon of gasoline (octane) has a mass of 2.66 kg. What is the maximum amount of heat that can be produced when one gallon of gasoline is burned with air?
A)17,320 kJ/gal
B)111,270 kJ/gal
C)116,320 kJ/gal
D)127,650 kJ/gal
8
In a metallurgical process, methane is burned at constant pressure, with a stiochiometric amount of air both of which are at 25°C. What is the maximum temperature of the products?
A)1930 K
B)2320 K
C)2890 K
D)3170 K
9
How irreversible is the combustion of methane at standard atmospheric pressure with 20% excess air when all reactants and products are at 25°C and the water in the products is all liquid?
A)630,000 kJ/kg-mol-CH4
B)780,200 kJ/kg-mol-CH4
C)884,700 kJ/kg-mol-CH4
D)1,110,000 kJ/kg-mol-CH4
10
What is the reversible work for CH4 burned with stiochiometric air when all products and reactants are at the standard referance state?
A)673,500 kJ/kg-mol-fuel
B)718,300 kJ/kg-mol-fuel
C)793,000 kJ/kg-mol-fuel
D)817,900 kJ/kg-mol-fuel





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