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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: AU204
Course Name: CI ENGINES AND COMBUSTION (AU)
Max. Marks: 100 Duration: 3 Hours
PART A
Answer any three full questions, each carries 10 marks Marks
1 2) Describe the types of in-cylinder air motions in CI engines. (5)
b) Compare SI and CI engine knock. (5)
2 Explain various events in CI engine combustion with the help of 2-0 diagram. (10)
3 Sketch a typical fuel supply system for CI engine. List all the components along (10)
with theirfunctions.
4 Illustrate and explain modern distributor type fuel pump. What are itsadvantages (10)
over inline pump.
PART B
Answer any three full questions, each carries 10 marks
5 2) Compare Unit pump system and Unit injection system. (6)
b) List various sensors used in CI engines fuel supply system. (4)
6 Explain the working of CRDI engines. State its advantages over conventional (10)
engines.
7 Demonstrate the method of flue gas analysis using ORSAT apparatus. (10)
8 Explain the procedure of performing the Morse test and heat balance test in IC (10)
engine.
PART C
Answer any four full questions, each carries 10 marks
9 Tabulate sources and conditions for formation of regulated emissions from IC (10)
engine.
10 Explain the standard method used for NO and smoke measurement. (10)
11 With illustrations explain any two after treatment devices used in IC engine. (10)
12 Define Turbocharging. Explain any two methods of turbocharging with simple (10)
block diagrams.
13 Explain different types of superchargers with neat sketches. (10)
14 a) With P-v diagram, explain the effect of supercharging on air standard Otto cycle. (5)
b) Explain a typical cold starting device used in CI engine. (5)
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