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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: AU201
Course Name: S.I. ENGINES AND COMBUSTION (AU)
Max. Marks: 100 Duration: 3 Hours
PART A
Answer any three full questions, each carries 10 marks. Marks
1 What is the difference between Otto Cycle and Diesel Cycle? Derive and )10(
expression to find out the air standard efficiency and mean effective pressure of
diesel cycle.
2 Why actual cycle efficiency is much lower than air-standard cycle efficiency? (10)
Draw a p-V diagram of ideal cycle and shades the respective portions related to
losses to get actual cycle. Briefly explain all the losses in actual cycle.
3 Explain the P- 0 diagram of a typical SI Engine. Tabulate the parameters and their (10)
influence on each stages of combustion.
4 Describe the factors and variables that affect engine knock. (10)
PART B
Answer any three full questions, each carries 10 marks.
5 What are different GDI Engine Burning modes? How they are achieved? (10)
6 a) Compare battery and magneto ignition system. (5)
b) Explain the working of any one type of conventional ignition system. (5)
7 Draw a connecting rod used for automotive application and explain the function of (10)
each part. Also, comment on thedesign considerations and materials used.
8 Explain the construction and working of a three-port engine. (10)
PART C
Answer any four full questions, each carries 10 marks.
9 Explain the construction and working of variable valve timing mechanism used in (10)
Honda cars.
10 ஐ Sketch and explain poppet valve. (5)
b) Explain the working of overhead valve mechanism. (5)
11 Explain the components of exhaust system of SI Engines. (10)
12 Explain the following with respect to engine cooling system. (10)
a) Pressure cap. (5)
b) Evaporative cooling system. (5)
13 Explain different types of lubrication system used for IC Engine application s (10)
14 Explain the following : (10)

i) Oil additives ii) Chassis lubrication
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