apj abdul kalam technological university fourth … engines... · max. marks: 100 duration: 3 hours...

C D1027 Pages: 2

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Reg No.:_______________ Name:__________________________

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FOURTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), MAY 2019

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 a) Explain the properties of C.I. Engine fuels 4

b) Define the Cetane number? 2

c) Differentiate knocking phenomena in petrol and diesel engine? 4

2 a) Discuss the stages of combustion in C.I. Engine with P-θ diagram 5

b) Mention the different types of combustion chambers in C.I Engines 5

3 a) What are the basic requirements of diesel injection systems? 5

b) Describe different types of diesel injection system? 5

4 a) With neat sketch explain various types of fuel nozzles used in diesel fuel

injection system

6

b) Explain the different types of Air filters in C I engines 4

PART B

Answer any three full questions, each carries 10 marks

5 a) Draw a basic layout of EDC and briefly explain each sub systems 10

6 a) Briefly explain the working of Electronic Unit Injector (EUI). 10

7 a) How is flue gas analysis carried out by Orsat's apparatus? 6

b) What is the significance of valve timing diagram? 4

8 a) What is a heat balance sheet for an engine? 4

b) Explain the procedure for conducting the morse test on the I.C engines. Show the

method of calculation of frictional power.

6

PART C

Answer any four full questions, each carries 10 marks

9 a) Explain the standard methods used for HC, CO. And CO2 measurement 10

10 a) What are catalytic converters? How are they helpful in reducing HC, CO and

NOx emissions.

10

C D1027 Pages: 2

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11 a) Explain the different pollutants from C I Engines and its Effects 5

b) Explain the different types of cold starting devices used in C I Engines 5

12 a) Write short notes on Supercharging 3

b) What are the objectives of super –charging 3

c) Differentiate between super-charging and turbo charging 4

13 a) Explains the term turbo-charging and show the arrangements through a

schematic diagram.

5

b) Explain any two method of turbo charging 5

14 a) Explain any two types of governors used in C I Engines? 10

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C S2062 Pages: 2

Page 1 of 2

Reg No.:_______________ Name:__________________________


FOURTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018

Course Code: AU 204

Course Name: CI ENGINES AND COMBUSTION


PART A

Answer any 3 questions

1. List the precautions to be taken while handling and storage of diesel fuel? (10)

2. With the help of a P – θ diagram explain the stages / phases of combustion in a C.I

engine? (10)

3. Explain with the help of a sketch the construction and working of inline / jerk fuel

injection pump. (10)

4. a) What are the elements of fuel injection system in Diesel engines? Mention its

importance in diesel injection system. (6)

b) What are the factors that affect combustion in a CI engine? (4)

PART B


5. Explain with the help of a neat sketch the construction and working of an Electronic

Unit Injector. (10)

6. What is Electronic diesel control? Explain its functions. (10)

7. a) What is equivalence ratio? What is the relation between equivalence ratio and

exhaust gas? (4 )

b) What are the three important components required for complete combustion? Write

the general equation for complete combustion? (4 )

c) List the exhaust emissions from an IC engine. (2)

8. Explain how flue gas analysis is done using ORSAT apparatus. (10)

PART C


9. Explain the causes of hydrocarbon, NOXand co emissions in SI engines? (10)

10. Explain with a sketch the construction of a catalytic converter? (10)

C S2062 Pages: 2

Page 2 of 2

11. a. What are the non – exhaust emissions in a IC engine? (5)

b. What is the function of particulate traps in CI engines? (5)

12. a. What is supercharging? State its objectives? (4)

b. With the help of neat sketches explain any two methods of supercharging?

(6)

13. a. What are the supercharging limits of a SI engine and what are the factors on which

the limit depends? (6)

b. What are the design features required for an engine to be supercharged? (4)

14. Explain with a sketchthe different methods of turbocharging used in IC engines?

(10)

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C B4C0016

Page 1 of 2

Total Pages: 2 Reg No.:_______________ Name:__________________________


FOURTH SEMESTER B.TECH DEGREE EXAMINATION, JULY 2017

Course Code: AU204



PART A

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

1 a) Explain the ignition delay in diesel engines and its influencing factors? (6)

b) What are the advantages of direct combustion chamber over indirect combustion chamber? (4)

2 a) How do you differentiate knocking phenomena in petrol and diesel engine? (6)

b) What are the important points that should be borne in mind when considering a new

combustion chamber for a diesel engine? (4)

3 a) What is the importance of air movement inside combustion chamber of a C.I

engine?

(4)

b) With neat sketch explain various types of fuel nozzles used in diesel fuel injection

system.

(6)

4 a) Explain diesel engine fuel supply system by illustrating the functions of each

components associated with it.

(6)

b) List the important properties of diesel fuel. (4)

PART B

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

5 Explain the Electronic Diesel Control System with layout? (10)

6 a) List out the various sensors and actuators used in CRDI Engines? (5)

b) Explain the Electronic Unit Injection (EUI) used in diesel engines? (5)

7 a) What is the significance of preparing heat balance sheet for an IC engine? (5)

b) Draw a typical valve timing diagram for a four-stroke diesel engine and mark the

valve overlap.

(5)

8 a) Name four basic performance parameters of an engine. (4)

b) How is flue gas analysis carried out by Orsat's apparatus? (6)

PART C

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

9 a) Discuss the emissions from diesel engines. On what factors, these emissions

depend.

(6)

b) What is the cause of formation of NOx in diesel engine exhaust? (4)

10 a) What are catalytic converters? How are they helpful in reducing HC, CO and NOx

emissions?

(6)

b) Explain the working of particulate trap (4)

C B4C0016

Page 2 of 2

11 a) Propane (C3H8) is reacted with air for the complete combustion. Find the air-fuel

ratio.

(5)

b) Give the details of recently revised emission norms in India. (5)

12 a) What are the objectives of super –charging? (4)

b) Explains the term turbo-charging and show the arrangements through a schematic

diagram.

(6)

13 a) What is the supercharging limits of S.I engines? (4)

b) List the type of superchargers used for I.C engines. (6)

14 a) Define the terms boost pressure and pressure ratio. (4)

b) Supercharging is essential for diesel engines than petrol engine. Justify this

comment.

(6)

****

C B4C014 Pages:1

Page 1 of 1

Reg No._____________ Name:_______________________


FOURTH SEMESTER B.TECH DEGREE EXAMINATION, JUNE 2017

Course Code: AU204


Max. Marks:100 Duration: 3 Hours

PART A

Answer any three questions. Ten marks each.

1. 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)

2. List all CI engine combustion chambers. Describe any one type each category.

3. Explain any two types of fuel feed pump for CI engine applications.

4. Compare different types of injector nozzles.

PART B

Answer any three questions. Ten marks each.

5. With neat schematic, explain a typical CRDI fuel injection system.

6. Draw a basic layout of EDC and briefly explain each subsystem.

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

theoretical valve timing diagram.

8. 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.

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

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

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

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

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

13. Explain different types of governors used in CI engines.

14. a. Compare supercharging and turbocharging. (5)

b. Account for the limits of super charging in SI and CI engine. (5)

***

apj abdul kalam technological university fourth … engines... · max. marks: 100 duration: 3 hours...

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