Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2161902 Internal Combustion Engines Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2161902 Date: 06/12/2019
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.
MARKS
Q.1 (a) Draw Port timing diagram of two stroke diesel engine. 03
(b) Explain effect of dissociation with suitable graphs. 04
(c) Define the following terms: (1) Bore (2) Stroke (3) Dead Centres
(4) Clearance volume (5) Swept volume (6) Compression ratio
(7) Piston speed.
07
Q.2 (a) Explain bomb calorimeter with neat sketch. 03
(b) Compare Gasoline with CNG. 04
(c) Explain Solex Carburetor with neat sketch. 07
OR
(c) What are the requirements of ideal injection system for C.I.
Engine?
07
Q.3 (a) What are the functions of Ignition system? 03
(b) Compare battery ignition system with magneto ignition system. 04
(c) Explain High voltage capacitive discharge ignition system with
neat sketch.
07
OR
Q.3 (a) What are the objectives of supercharging? 03
(b) Explain the effects of supercharging. 04
(c) What is turbocharging? State the types of turbocharging and
explain any one with neat sketch.
07
Q.4 (a) What is ignition limit? 03
(b) Explain factors affecting on ignition lag in S. I. engine. 04
(c) Explain the stages of combustion of S.I. engine. 07
OR
Q.4 (a) What is knocking? 03
(b) Explain factors affecting on delay period in C.I. engine. 04
(c) Explain the stages of combustion of C.I. engine. 07
Q.5 (a) Compare wet and dry sump lubrication system 03
(b) Explain Exhaust Gas Circulation (EGR) with neat sketch. 04
(c) A one liter capacity, 4-stroke, 4 cylinder S.I. engine gives 30 %
brake thermal efficiency and develops 40 kW indicated power at
full load. The mechanical efficiency at half load is 35 % and
compression ratio is 8. Assuming constant mechanical losses,
Calculate. (1) Brake power and frictional power at full load (2)
Mechanical efficiency at full load (3) Indicated thermal efficiency
at full load (4) Clearance volume.
07
OR
Q.5 (a) Explain Flame Ionization Detector with neat sketch. 03
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2161902 Date: 06/12/2019
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.
MARKS
Q.1 (a) Draw Port timing diagram of two stroke diesel engine. 03
(b) Explain effect of dissociation with suitable graphs. 04
(c) Define the following terms: (1) Bore (2) Stroke (3) Dead Centres
(4) Clearance volume (5) Swept volume (6) Compression ratio
(7) Piston speed.
07
Q.2 (a) Explain bomb calorimeter with neat sketch. 03
(b) Compare Gasoline with CNG. 04
(c) Explain Solex Carburetor with neat sketch. 07
OR
(c) What are the requirements of ideal injection system for C.I.
Engine?
07
Q.3 (a) What are the functions of Ignition system? 03
(b) Compare battery ignition system with magneto ignition system. 04
(c) Explain High voltage capacitive discharge ignition system with
neat sketch.
07
OR
Q.3 (a) What are the objectives of supercharging? 03
(b) Explain the effects of supercharging. 04
(c) What is turbocharging? State the types of turbocharging and
explain any one with neat sketch.
07
Q.4 (a) What is ignition limit? 03
(b) Explain factors affecting on ignition lag in S. I. engine. 04
(c) Explain the stages of combustion of S.I. engine. 07
OR
Q.4 (a) What is knocking? 03
(b) Explain factors affecting on delay period in C.I. engine. 04
(c) Explain the stages of combustion of C.I. engine. 07
Q.5 (a) Compare wet and dry sump lubrication system 03
(b) Explain Exhaust Gas Circulation (EGR) with neat sketch. 04
(c) A one liter capacity, 4-stroke, 4 cylinder S.I. engine gives 30 %
brake thermal efficiency and develops 40 kW indicated power at
full load. The mechanical efficiency at half load is 35 % and
compression ratio is 8. Assuming constant mechanical losses,
Calculate. (1) Brake power and frictional power at full load (2)
Mechanical efficiency at full load (3) Indicated thermal efficiency
at full load (4) Clearance volume.
07
OR
Q.5 (a) Explain Flame Ionization Detector with neat sketch. 03
2
(b) Explain forced circulation thermostat cooling system. 04
(c) A 4 cylinder, 4 stroke petrol engine develops 21 kW. A Morse
test was conducted at constant speed of 3000 rpm and B. P. is
measured, when each cylinder was cut-off are 14.8, 14.5, 14.6 and
14.75 kW respectively. Find I.P. of the engine when all cylinders
are developing power. Also find mechanical efficiency and brake
mean effective pressure. Take bore = 7.5 cm and stroke = 9 cm.
07
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This post was last modified on 20 February 2020