Answer  ALL  Questions

PART – A   (10 x 2  =  20  Marks)

 1.What are four stroke and two stroke engines?

2Explain what is meant by Cetane number.

3.What are the different types of fuel injection systems used in CI engines?

4.Name the different types of fuel injectors used in Diesel engine.

5.What is the importance of swirl in an engine?

6.Name the types of combustion chambers used in modern diesel engines.

7.What is turbo charging and how it is advantageous?

8.Why the charge cooling is needed in turbocharged engines?

9.Name the performance parameters of a diesel engine.

10.Sketch the typical performance curves of an automotive diesel engine.


PART – B     (5 x 16 = 80  Marks)


11.Describe with suitable sketches, the various stages of combustion in a diesel engine.

12.a)i) List the major differences between the actual cycle and the air standard cycle.

ii) Why the efficiency of the actual cycle is lower than that of the air standard cycle. List the various losses in an actual engine.



12.b)i)  What are the important qualities of a CI engine fuel?

ii) Discuss how diesel is rated for antiknock quality and explain how the Cetane number is determined in a laboratory.


13.a) Describe the construction and working of the jerk type fuel injection pump.


13.b) Describe the mechanism of spray formation and discuss the fuel spray characteristics.


14.a)i)  What is meant by delay period and what are the factors that affect the delay period?    

 ii)  Write a note on knock in Diesel engines. 


14.b)i) What are the requirements of a combustion chamber in a diesel engine and what are their design objectives?

  ii)  Write a note on swirl type combustion chambers.


15.a)i)  What are the merits and limitations of turbo charging?        

       ii)  Explain how the turbocharger is matched with an engine.


15.b) Explain the variables that affect the performance of an automotive diesel engine and describe how the engine performance maps are obtained.





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