AE2202 Aero Engineering Thermodynamics B.E Question Bank : mamse.co.in

Name of the College : MAM School of Engineering
University : Anna University Chennai
Subject Code/Name : AE2202-Aero Engineering Thermodynamics
Dept : AERONAUTICAL ENGINEERING
Degree : B.E
Year/Sem: II/III
Website : mamse.co.in
Document Type : Question Bank

Download Model Question Paper : https://www.pdfquestion.in/uploads/mamse.co.in/3196-AE2202.pdf

Aero Engineering Thermodynamics

Unit – I

PART-A :
[10*2=20]
1. Write the first law of thermodynamics for a cycle and a process.
2. Differentiate between point and path function.

Related : MAM School of Engineering AE2302 Aircraft Structures B.E Question Bank : www.pdfquestion.in/3200.html

3. Draw the otto cycle on a p – v diagram and mark the processes.
4. What are the assumptions made in air standard cycle analysis?
5. What is meant by quality of steam? Does it have any meaning in the superheated vapour region?
6. Define the terms: thrust and specific impulse.
7. What is a ton of refrigeration?
8. What are the desirable properties of a refrigerant?
9. What is Fourier’s law of heat conduction?
10. Define the terms: Black body and Opaque body.

PART-B : [5*16=80]
1. (a) A centrifugal air compressor delivers 15 kg of air, per minute. The inlet and outlet conditions of air are V1 = 10m/s, p1 = 1 bar vs1 = 0.5 m3/kg and V2 = 80 m/s, p2 = 7 bar, vs2 = 0.15 m3/kg. The increase in enthalpy of air passing through the compressor is 160 kJ/kg and heat loss to the surroundings is 720 KJ/min. Find the power required to drive the compressor. Assume that inlet and discharge lines are at the same level.
Or (b) Two Carnot engines work in series between the sources and sink temperature of 500 K and 300 K. If both engines develop equal power. Determine the intermediate temperature.

2. (a) In an air standard otto cycle the compression ratio is 6. The compression begins 400C and 0.1 MPa. The heat supplied per kg of air at the end of the compression is 852 KJ. Find the temperature and pressure at all salient points and the efficiency.
Or (b) A single stage double acting air compressor of 62.5 kW I.P. running at 120 r.p.m. takes air at 1 bar and delivers at 10 bar. Assuming the law of expansion and compression as pv 1.35 = constant, find the diameter and stroke of the cylinder.

3. (a) A steam power plant operating on Rankine cycle works between 40 bar and 0.05 bar. If the steam supplied is dry saturated, find the cycle efficiency and specific steam consumption.
Or (b) An aircraft flies at 960 kmph. One of its turbojet engines takes in 40 kg/s of air and expands the gases to the ambient pressure. The air – fuel ratio is 50 and the lower calorific value of the fuel is 43 MJ/kg. For maximum thrust power determine (i) Jet velocity (ii) Thrust (iii) Specific thrust (iv) Thrust power (v) Propulsive, thermal and overall efficiencies and (vi) TSFC

4. (a) A refrigerating machine using R12 works between – 180 C and 370 C. the enthalpy of liquid at 370 C is 71 kJ/kg. The enthalpies of R12 entering and leaving the compressor are 183 kJ/kg and 210 kJ/kg respectively. The rate of circulation of refrigerant is 2 kg/min and efficiency of compressor is 0.85. Determine: (i) Capacity of the plant in tons of refrigeration (ii) Power required running the plant. (iii) COP of the plant.
Or (b) With neat sketches, explain the working of winter air –conditioning system.

5. (a) Show that in the case of reciprocating compressor, the work input is independent clearance ratio. Explain with the help of p – v diagrams.
Or (b) Derive an expression for the volumetric efficiency of a two – stage reciprocating compressor in terms of clearance ratio and pressure ratio

Unit – II

PART-A [10*2=20]
1. Differentiate between intensive and extensive properties giving examples.
2. What is meant by quasi – static process?
3. Briefly explain the term mean effective pressure.
4. What are the assumptions in air standard cycles?
5. What is meant by triple point of steam?
6. Define specific impulse and explain its importance.
7. How the cooling capacity of a refrigeration system is defined?
8. What are the important parameters to be considered in the selection of a refrigerant?
9. What is the advantage of multistage compression with intercooling?
10. Represent the processes in an idealized reciprocating compressor by P – V diagram.

PART-B [5*16=80]
1. (a) (i) Heat and work are the energy in transmit and inexact differentials. Explain.
(ii) A reversible heat engine in a satellite operates between a hot reservoir at T1 and a radiating panel at T2. Radiation from the panel is proportional to its area and to the fourth power of T2. For a given work output and values of T1 show that the area of the panel will be minimum when T2/ T1 = 0.75
(b) (i) State Kelvin-Planck and Clausis statement of second law of thermodynamics.
(ii) Show that both the above statements are equivalent in all respects.
(iii) A heat engine operates between a source at 6000C and a sink at 200

C. Determine the minimum rate of heat rejected if the work output is 2 kW. Estimate the same if the engine operates at 40% of ideal efficiency.
2. (a) An ideal diesel cycle using air as the working fluid has a compression ratio of 16 and a cut off ratio of
2. The intake conditions are 100 kPa, 200 C and 2000 cm3. Determine
(i) The net work output
(ii) Thermal efficiency of cycle
(iii) The mean effective pressure.
Or
(b) (i) Represent the processes of Brayton cycle by P-V and T – S diagram.
(ii) Derive an expression for thermal efficiency of Brayton cycle as a function of pressure ratio.
(iii) A gas turbine plant operates on the Brayton cycle between Tmin = 300 K and Tmax = 1073 K. Find the maximum work done per kg of air and the corresponding cycle efficiency. Compare the efficiency with carnot efficiency operating between the same two temperature