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

FirstRanker.com

GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020

--- Content provided by FirstRanker.com ---

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.

--- Content provided by‍ FirstRanker.com ---

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

--- Content provided by‍ FirstRanker.com ---

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

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

--- Content provided by‌ FirstRanker.com ---

(b) List the different compensating devices used in modern carburetor and explain any one in detail. 04
(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 governing. 03
(b) Explain heat and miss type governing system. 04
(c) Explain solex carburetor with neat figure. 07

--- Content provided by‌ FirstRanker.com ---

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 engine. 04

--- Content provided by⁠ FirstRanker.com ---

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

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

--- Content provided by FirstRanker.com ---

(b) Draw the layout of diesel engine power plant. 04
(c) List the different method of turbocharging and explain pulse converting turbocharging method. 07