Download GTU B.Tech 2020 Summer 8th Sem 2180215 Automotive And Combustion Engine Technology Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 8th Sem 2180215 Automotive And Combustion Engine Technology Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER-VIII EXAMINATION- SUMMER 2019
Subject Code:2180215

Date:02/11/2020
Subject Name: Automotive and Combustion Engine Technology
Time: 02.30 PM TO 05.00 PM




Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.



MARKS
Q.1 (a) List the advantages of engine downsizing.
03

(b) What are the types of nozzle are used in gasoline direct injection?
04

(c) Explain the combustion phenomenon for gasoline engine.
07
Q.2 (a) What is charge stratification combustion?
03

(b) Explain supercharging of engine.
04

(c) Explain the reasons of knocking in SI Engine. List various methods to reduce
07
knocking.


OR


(c) Explain salient feature of spray guided combustion system for gasoline direct
07
injection
Q.3 (a) Enlist various after treatment technologies for diesel and gasoline vehicle.
03

(b) What is lean boost direct injection (LBDI) concept? Explain the working principle
04
of LBDI

(c)
What are the advantages of combining direct injection and turbo charging in spark-
07
ignition engine?


OR

Q.3 (a) What is internal exhaust gas recirculation system and external exhaust gas
03
recirculation system?

(b) What is auto ignition phenomenon? What is the basic difference between auto
04
ignition combustion and SI combustion?

(c)
Explain effect of different properties of gasoline on combustion phenomenon
07
Q.4 (a) Explain factors which increase NOx production in CI engine.
03

(b) With a neat sketch explain the process of turbo charging?
04

(c)
Differentiate homogenous combustion and diffusion combustion based on any
07
seven aspects.

OR

Q.4 (a) Explain the principle of auto ignition combustion in the gasoline engine.
03

(b) What is Turbo Lag in Turbocharging?
04

(c)
Explain the effect of fuel injection timing on auto ignition combustion.
07
Q.5 (a) Give advantage of HCCI engine.
03

(b) Which are the modifications required to change from SI combustion to auto
04
ignition combustion?

(c)
Describe how the selective catalytic reduction (SCR) NOx control as an alternative
07
to lean NOx traps (LNT)


OR
Q.5 (a) What is Gasoline Direct Injection?
03
(b) Explain EGR with the neat sketch
04
(c)
Describe the stages of combustion of HCCI in gasoline engines.
07

1

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