Download GTU B.Tech 2020 Winter 6th Sem 2161902 Internal Combustion Engines Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 6th Sem 2161902 Internal Combustion Engines Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VI (NEW) EXAMINATION ? WINTER 2020
Subject Code:2161902 Date:22/01/2021
Subject Name:Internal Combustion Engines
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Define (1) Compression ratio (2) Cut off ratio (3) Air fuel ratio
03

(b) Draw port timing diagram for two stroke petrol engine.
04

(c) Explain different kind of loss in actual fuel cycle compare to air
07
standard cycle.



Q.2 (a) Define (1) HCV (2) LCV (3) Adiabatic flame temperature
03

(b) Derive stoichiometry air fuel ratio for octane as gasoline fuel
04

(c) Explain different components used in MPFI engine.
07




Q.3 (a) Write down difference between supercharging and turbocharging.
03

(b) List the different compensating devices used in modern carburetor
04
and explain any one in detail.

(c) Derive the equation of exact air fuel ratio for single jet carburetor.
07




Q.4 (a) Define (1) Firing order (2) Quality governing (3) Quantity
03
governing.

(b) Explain heat and miss type governing system.
04

(c) Explain solex carburetor with neat figure.
07



Q.5 (a) Define (1) Auto ignition (2) Detonation (3) Pre-ignition
03

(b) Explain M. type combustion chamber.
04

(c) Explain combustion stages in CI engine.
07



Q.6 (a) Define (1) Ignition lag (2) Delay period (3) Octane number
03

(b) Explain any two methods to control the knocking tendency in SI
04
engine.

(c) Explain thermo syphon cooling system with neat sketch.
07



Q.7 (a) Define (1) Thermal efficiency (2) Indicated power (3) Mechanical
03
efficiency.

(b) Explain willan's line method for engine testing.
04

(c) Explain magneto ignition system with neat sketch.
07



Q.8 (a) Difference between Euro norms and Bharat stage norms.
03
(b) Draw the layout of diesel engine power plant.
04
(c) List the different method of turbocharging and explain pulse
07
converting turbocharging method.

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