Download PTU B.Tech 2020 March ME 6th Sem I.C Engines Question Paper

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Roll No. ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ Total No. of Pages : 02
Total No. of Questions : 09

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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Q1 Answer briefly :

1. What is heat engine?
2. Discuss the valve timing diagram of 4-stroke petrol engine.
3. Discuss the role of composition of cylinder gases in fuel air cycles.
4. Explain various types of IC engines fuels.

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5. What do you mean by petrol injection system for C.I?
6. Discuss the significance of fuel injector system in engines.
7. Why ratings of S.I engine fuels is done?
8. Explain what is governing of I.C engines.
9. Give the purpose of supercharging.

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10. How performance of S.I engine is checked?

SECTION-B

Q2 Discuss with suitable diagram working of 2-stroke petrol engine and its valve timing diagram.

Q3 Discuss the differences between Actual and fuel air cycle for S.I engines.

Q4 Discuss the important qualities of S.I Engine fuels.

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Q5 Discuss the actual air fuel ratio of single jet carburetor and also discuss the ideal requirements from a carburetor.

Q6 Calculate the diameter and length of the stroke of a diesel engine working on four-stroke constant pressure cycle from the given data : I.P =18.75 kW. R.P.M= 220. Compression ratio = 14 Fuel cut-off = 1/20™ of the stroke. L/d=1.5. Index of expansion= 1.3, Index of compression = 1.35, Assume the pressure and temperature of the air at the inlet are 1 bar and 40°C.

SECTION-C

Q7 Explain various type of supercharger and discuss the arrangement and installation of supercharger for S.I engines?

Q8 A Carnot cycle works between the temperature limits of 900k and 400k and the pressure limits of 60 bar and 1 bar. Find the, following

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1. Pressure and temperature ‘at-all salient points.
2. Work done per kg of air.
3. Heat supplied and rejected per kg of air.
4. Thermal efficiency of the cycle.
5. Mean effective pressure of the cycle

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Q9 Discuss the important qualities of C.I Engine fuels.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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