Download GTU BE/B.Tech 2018 Winter 8th Sem New 21802102180215 Automptive And Combustion Engine Technology Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 8th Sem New 21802102180215 Automptive And Combustion Engine Technology Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2180210/2180215 Date: 19/11/2018

Subject Name: Automptive 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.


Q.1 (a) What is engine downsizing? 03
(b) How is stratified charge combustion achieved? 04
(c) What are the types of nozzle used in gasoline direct injection? Also explain
their constructional features.
07

Q.2 (a) What is lean boost direct injection (LBDI) concept? 03
(b) Explain Lean NOx trap 04
(c) What are the problems associated with turbo charging the spark-ignition
engine? Explain any two of the problems in detail.
07
OR
(c) Describe the three combustion concepts (wall, air and spray) for the
implementation of mixture preparation of gasoline direct injection
07
Q.3 (a) Write short notes on exhaust emission. 03
(b) Explain the salient features of the first-generation 04
(c) Describe the different approaches to HCCI operation in gasoline engines? 07
OR
Q.3 (a) Write short notes on exhaust gas treatment on fuel economy. 03
(b) Explain the salient features of the second-generation 04
(c) With a neat sketch explain thermodynamic analysis of gasoline direct
injection at part-load condition.
07
Q.4 (a) Write short notes on engine knock 03
(b) Mention the advantages of direct injection system. 04
(c) Describe how the selective catalytic reduction (SCR) NOx control as an
alternative to lean NOx traps (LNT).
07
OR
Q.4 (a) Draw a diagram of a typical DI gasoline engine with sensors and control 03
(b) Explain the conventional diesel combustion with a neat sketch. 04
(c) Explain the principle of autoignition combustion in the gasoline engine. 07
Q.5 (a) What is turbo charging? 03
(b) With a neat sketch explain the process of turbo charging? 04
(c) Describe the different approaches to HCCI operation in gasoline engines? 07
OR

Q.5 (a) Explain the thermodynamic aspects of gasoline direct injection 03
(b) Differentiate turbo charging and super charging. 04
(c) Describe the fundamental principle of HCCI combustion in gasoline
engines.
07


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