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Total Pages: 2

Name:

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

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

PARTA
Answer any three full questions. Each question carries 10 marks.

Explain the ignition delay in diesel engines and its influencing factors?
Whatare the advantages of direct combustion chamber over indirect combustion chamber?
How do you differentiate knocking phenomena in petrol and diesel engine?
What are the important points that should be borne in mind when considering a new
combustion chamber for a diesel engine?
What is the importance of air movement inside combustion chamber of a ൨
engine?
With neat sketch explain various types of fuel nozzles used in diesel fuel injection
system.
Explain diesel engine fuel supply system by illustrating the functions of each
components associated with it.
List the important properties of diesel fuel.

PART 8

Answer any three full questions. Each question carries 10 marks.

Explain the Electronic Diesel Control System with layout?
List out the various sensors and actuators used in CRDI Engines?
Explain the Electronic Unit Injection (हता) used in diesel engines?
What is the significance of preparing heat balance sheet for an IC engine?
Draw a typical valve timing diagram for a four-stroke diesel engine and mark the
valve overlap.
Name four basic performance parameters of an engine.
How is flue gas analysis carried out by Orsat's apparatus?
PART C
Answer any four full questions. Each question carries 10 marks.

Discuss the emissions from diesel engines. On what factors, these emissions
depend.

What is the cause of formation of NOx in diesel engine exhaust?

What are catalytic converters? How are they helpful in reducing HC, CO and NOx
emissions?

Explain the working of particulate trap

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