FACULTY OF ENGINEERING B.E. 3/4 (Mech.Prod) I-Semester (New)(Main) Examination, November/ December 2012 Subject : Applied Thermodynamics and Heat Transfer Time : 3 Hours
Max. Marks: 75
Note: Answer all questions of Part - A and answer any five questions from Part-B. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
12.
PART – A (25 Marks) List out the advantages of multi-staging in reciprocating air compressors and define volumetric and isothermal efficiency of reciprocating air compressor. Write the importance of an inter cooler placed in between two stages of a multistage air compressor. Compare the relative advantages and disadvantages of four-stroke and twostroke cycle engines. Explain why deviation exists between actual cycles and air standard cycles in IC engines. What is pre-ignition and what is detonation? Write the desirable characteristics of combustion chamber for S.I. engines. Define and explain the significance of critical radius of insulation. What is composite wall and write an equation of heat transfer through composite wall. Explain the significance of Grashof number and Reynolds number in convection heat transfer. What is Stefan-Boltzmann law and distinguish between a black body and gray body. PART – B (5x10=50 Marks) A single-stage double-acting air compressor is required to deliver 14m3 of air per minute measured at 1.013 bar and 15oC. The delivery pressure is 7 bar and the speed is 300 rpm. Take the clearance volume as 5% of the swept volume with the compression and expression index of n=1.3. Calculate (a) swept volume of the cylinder (b) The delivery temperature (c) indicated power. A two-stroke cycle I.C. engine has a mean effective pressure of 6 bar. The speed of the engine is 1000 rpm. If the diameter of the piston and stroke are 110mm and 140mm respectively. Find the indicated power developed.
13.(a) Briefly explain the various stages of combustion in S.I. Engines. (b) Describe the working principle of a simple carburettor. 14.
A fireclay wall 20cm thick has its two surfaces maintained at 1000oC and 200oC. Thermal conductivity of the fireclay varies with temperature as K=0.813 + 0.000582 Tm. (K is in w / mK). Calculate the rate of heat flow.
15.
Hot oil with a capacity rate of 2500 W/K flows through a double pipe heat exchanger. It enters at 360oC and leaves at 300oC. Cold fluid enters at 30oC and leaves 200oC. If the overall heat transfer coefficient is 800 W/m2 K determine the heat exchanger area required for counter flow.
16.(a) Describe the working of a Four-Stroke petrol engine. (b) Explain temperature and velocity profiles in free convection on a vertical wall. 17.
Write short notes on : (a) Effect of clearance volume on work done and efficiency in reciprocating air compressor. (b) Lubrication system of an IC engines (c) Stefan-Boltzman law *****
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Page 1 of 2. Code No. 2342 / N. FACULTY OF ENGINEERING. B.E. 3/4 (Mechanical) I â Semester (New) (Main) Examination, Nov. / Dec. 2012. Subject : Applied Thermodynamics. Time : 3 hours Max. Marks : 75. Note: Answer all questions from PartâA and an
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