AE6301 Aero Engineering Thermodynamics
Second year, Department of Aeronautical Engineering
First and second Units Questions.
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PART A – (10 x 2 = 20 Marks)
1.      State zeroth law of thermodynamics?
2.      Define thermodynamic equilibrium?
3.      Differentiate between intensive and extensive properties giving examples?
4.      State the second law of thermodynamics?
5.      What is point and path functions? Give examples.
6.      What is thermodynamics temperature scale and why is its significance?
7.      What do you understand by reversible process and irreversible process?
8.      Explain isochoric and isobaric process
9.      Represent Carnot cycle in P-v diagram and T-s diagram and explain the process involved.
10.  What is Carnot theorem?
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PART - B [65 Marks]
  1. 1500KJ of heat is transferred to 1m3of air at 15 bar and 220oC. Find (i) the final temperature and pressure if the volume remains constant,(ii)the final temperature and volume if the pressure remains constant. After which process the internal energy of the air has a greater value?(iii)After the heating process, if the air is expanded isothermally to a pressure of P3=5 bar, what is the final volume in each case. Take Cp=1.005KJ/KgK, Cv=0.718KJ/KgK and R=0.287KJ/KgK                                                                                                                          (13)
12.  Three grams of nitrogen gas at 6 atm and 160 ℃ in a frictionless piston cylinder arrangement is expanded adiabatically to double its initial volume, then compressed at constant pressure to its initial volume and then compressed again at constant volume to its initial state. Calculate the network done on the gas. Draw the p-v diagram for the processes. .                                        (13)
13.  An insulated rigid tank having 5 kg of air at 3 atm and 30℃ is connected to an air supply line at 8 atm and 50℃ through a valve. The valve is now slowly opened to allow the air from the supply line to flow into the tank until the rank pressure reaches 8 atm and then the valve is closed. Determine the final temperature of the air in the tank and find the amount of air added to the tank.                                                                                                                                    (13)
  1. Air of 0.03 m3 at 2 bar and 300K is compressed to a volume of 0.003m3 according to the law PV1.3=constant. What is the final temperature and work done during compression and change internal energy, heat transfer, change in enthalpy? Also sketch the PV graph?                     (13)
15.   A reversible heat engine operating between thermal reservoirs at 800℃ and 300℃ drives a reversible refrigerator which refrigerates a space at -15℃ and delivers heat engine to a thermal reservoir at 30℃.the heat input to the heat engine is 1900 kJ and there is a network output from the combined planet of 290 kJ; determine the heat transfer to the refrigerant and the total heat transfer to the 30℃ thermal reservoir.                                                                                (13)
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PART - B [15Marks]
16.  Why is the Carnot cycle not suitable as an ideal cycle for all power producing cycle devices? (15)