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Reg No. Name:

B4C014 Pages:1

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, JUNE 2017

Course Code: AU204
Course Name: CI ENGINES AND COMBUSTION (AU)

Max. Marks:100 Duration: 3 Hours

1.

PART A
Answer any three questions. Ten marks each.

a. List and define five fuel properties significant to diesel fuel. How this property will
affect combustion. (5)

b. List any two alternative fuels for crude diesel. Mention its properties. (5)
List all CI engine combustion chambers. Describe any one type each category.
Explain any two types of fuel feed pump for CI engine applications.
Compare different types of injector nozzles.
PART B

Answer any three questions. Ten marks each.
With neat schematic, explain a typical CRDI fuel injection system.
Draw a basic layout of EDC and briefly explain each subsystem.

Explain the valve timing diagram of a high speed diesel engine. Compare it with
theoretical valve timing diagram.

Define and give mathematical expression for calculating the following:

(a) Indicated power (b) Brake power (c) Volumetric Efficiency (d) Indicated mean
effective pressure (e) Frictional Power.

PART C
Answer any four questions. Ten marks each.

Illustrate and describe the standard methods used for CO and HC measurement.

. Explain the mechanism of formation of NOx and soot form CI engine.

. ೩. What are the different sources of HC emissions in IC engine (5)

b. Explain any one method for control of non-exhaust emission. (5)

. Define supercharging. Explain with neat sketches any two methods of super charging.

. Explain different types of governors used in CI engines.

. a, Compare supercharging and turbocharging. (5)
b. Account for the limits of super charging in SI and CI engine. (5)
‏بد‎ ೫ ‏اد‎

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