Download GTU BE/B.Tech 2018 Winter 6th Sem Old 161902 Internal Combustion Engines Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem Old 161902 Internal Combustion Engines Previous Question Paper

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Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:161902 Date: 11/12/2018

Subject Name: Internal Combustion Engines

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) Explain with neat sketch Detonation in C. I. Engine. Also mention the
Factor affecting the detonation

07
(b) Explain use of alcohol as a fuel in IC Engines.

07

Q.2 (a) Explain with neat sketch Combustion stages in S. I .Engine. Also define
Auto ignition Temperature.
07
(b) Explain types of nozzles used in CI Engines.

07
OR
(b) Prove that e Air fuel Ratio for Simple Carburetor if air is assumed to be
incompressible is equal to
A.F. Ratio = Cda Aa ?2?a.(?p)
_______________________
Cdf Af ?2?f [(?p) ? h g ?f]
07

Q.3 (a) Explain hydrogen used as a fuel in IC Engines.

07
(b) Explain the Methods of obtaining Friction Power and explain any one of
them in details.
07
OR
Q.3 (a) Explain following terms: burning time loss factor, heat loss factor,
pumping and friction loss.
07
Q.3 (b) Explain with neat sketch working Simple Carburetor. Also explain
Drawback and application of simple Carburetor.
07

Q.4 (a) Define Supercharging and give its advantages. Also explain the methods
of Supercharging and explain any of them.
07
(b) Explain simple jet type carburetor with neat sketch.

07
OR
Q.4 (a) What are the criteria for the selection of I.C.Engine fuels?

07
Q.4 (b) Explain alternative fuels for I. C. Engine and explain any one of Fuel in
details. Also Define Octane and Cetane No.
07

Q.5 (a) Explain Ignition Requirement. Also Give Types of Ignition Systems and
explain in detail any one of them.
07
(b) Explain alternative fuels for I. C. Engine and explain any one of Fuel in
details. Also Define Octane and Cetane No.
07
OR
Q.5 (a) Explain Valve Timing Diagram of 4 stroke petrol engines.

07
(b) What is Variable Compression Ratio(VCR) Engine and explain methods
of obtaining VCR and performance of VCR Engine.
07

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