RGPV Mechanical Engineering (Semester 6)
Internal Combustion Engines
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Solve Any question from Q.1(a,b) & Q.2(a,b)
1(a) Discuss the difference between theoretical and actual valve timing diagrams of a diesel engine.
7 M
1(b) Draw and explain the performance characteristics of SI engine.
7 M

2(a) Discuss the factors which affecting the volumetric efficiency of IC engine.
7 M
2(b) Compare the relative advantage and disadvantage of four stroke and two stroke cycle engines.
7 M

Solve Any question from Q.3(a,b) & Q.4(a,b)
3(a) Explain briefly combustion phenomenon in SI engines.
7 M
3(b) What is ignition lag? Discuss the effect of engine variables on ignition lag.
7 M

4(a) Write the difference between pre-ignition, auto-ignition and detonation.
7 M
4(b) Explain the phenomenon of knocking in SI engines. What are the different factors which influence the knocking .
7 M

Solve Any question from Q.5(a,b) & Q.6(a,b)
5(a) Discuss the various factors which affects combustion in CI engines.
7 M
5(b) Discuss salient features of various types of combustion chambers.
7 M

6(a) Explain the phenomenon of knock in CI engines and compare it with SI engine knock.
7 M
6(b) Explain briefly various phases of CI engine combustion.
7 M

Solve Any question from Q.7(a,b) & Q.8(a,b)
7(a) Give the classification of engine.
7 M
7(b) What are the differences between direct injection and indirect injection.
7 M

8(a) What do you mean by 'air injection' and 'solid injection'?
7 M
8(b) State the advantages and disadvantages of hydrogen as IC engine fuel.
7 M

Solve Any question from Q.9(a,b) & Q.10(a,b)
9(a) What are the basic types of carburetors? Explain in brief.
7 M
9(b) Explain briefly supercharging of CI-engines.
7 M

10(a) Discuss the low and high pressure super-charging.
7 M
10(b) Explain briefly the types of super charging arrangements.
7 M



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