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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER M.TECH DEGREE EXAMINATION, MAY 2016
Mechanical Engineering
(Internal Combustion Engine and Turbo Machinery)
07ME 6102ADVANCED THERMODYNAMICS AND COMBUSTION
Max. Marks: 60 Duration: 3 Hours
JANAF Table and Steam table are permitted to use
Q.no. Module 1 Marks
1a. Assuming air may be taken as a mixture of ideal gases which has mass composition
23.2% oxygen and 76.8%nitrogen, find the gas constant and apparent molecular weight
of air.

Answer or
1b. A vessel of 1.5m3 capacity contains oxygen at 7 bar and 40C. The vessel is connected to
another vessel of 3m3 capacity containing carbon monoxide at 1 bar and 15C. The
connecting valve opened and gases mix adiabatically. Calculate final temperature and
pressure of the mixture and change in entropy of the system. Cv for
oxygen=21.07kJ/moleK and Cv for carbon monoxide=20.86 kJ/mole K
1c. The pressure and volume of a gas during a process, change from 1bar and 2m3
respectively to 6bar and 4m3 respectively. During the process the increase in enthalpy of
the gas is 200kJ. Taking cv=10.4kJ/kgK, determine cp, R and change in internal energy.

Q.no Module 2 Marks
2a. What is absolute entropy? Explain the second law analysis of reaction system.

Answer or
2b. Methane gas enters a steady-flow adiabatic combustion chamber at 25°C and 1
atm. It is burned with 50 percent excess air that also enters at 25°C and 1 atm. Assuming
complete combustion,determine the reversible work and exergy destruction. Assume that
T0= 298 K and the products leave the combustion chamber at 1 atm pressure.
2c. Methane is burned with dry air. The molar analysis of the products on a dry basis is CO2
CO O2 2.95% and N2 86.85%. Determine
The air-fuel ratio on both a molar and a mass basis
The percentage theoretical air
The product mixtures at 1 atm were passed through a sufficiently long isothermal
duct kept at 45 oC. Comment on the durability of duct
Q. no Module 3 Marks
3a. Derive Vant Hoff Equation.
Answer or
3b. Explain the following with suitable equations
Gibbs relations
Equilibrium constant of reaction equilibrium
Fugacity and Activity
3c. One kilomole of carbon monoxide reacts with the theoretical amount of air to form an
equilibrium mixture of CO2, CO, O2, and N2 at 2500 K and 1 atm. Determine the
equilibrium composition in terms of mole fractions.
Q. no Module 4 Marks
4a. Derive the relation for internal energy and enthalpy of formation
Answer or
4b. Describe with the help of neat sketches the following calorimeter used for the
determination of heating values Bomb calorimeter Junkers gas Calorimeter.
4c. The lower heating value of propane at constant pressure and 250C is 2042055kJ/kg mole.
Find the higher heating value at constant pressure and at constant volume.

Q. no Module 5 Marks
5a. Explain the combustion phenomena in C I Engine.
Answer or
5b. Define swirl and squish. What are the methods for generation air swirl in CI Engine?
Give the advantages and disadvantages of the methods.
5c. Explain the flame propagation in S I Engine. Discuss the variables affecting flame
propagation.
Q. no Module 6 Marks
6a. What are the main sources of pollutants from petrol engine
Answer or
6b. Explain in detail about the soot formation and particle emission in Diesel engine.

6c. Describe with sketches the following methods petrol exhaust emission control
After burner.
Exhaust manifold rector.
Catalytic converter system.