Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2161902 Internal Combustion Engines Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161902 Date:20/11/2018
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.
MARKS
Q.1 (a) State the function of following I.C.engine components. 14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Cylinder head
Spark plug
Fuel pump
Radiator
Flywheel
Dynamic oil seal
Supercharger
Governor
Piston pin
Piston rings
Combustion chamber
Cam & follower set
Carburetor
Injector
Q.2 (a) Define Air standard, Fuel air and Actual cycle. 03
(b) Explain with a neat sketch the working of two stroke engine. 04
(c) Explain with neat sketch actual valve timing diagram of diesel engine
for law and high speed.
07
OR
(c) Explain with P-V diagram the effect of variable specific heat on Otto,
Diesel and Dual cycle.
07
Q.3 (a) List assumptions for fuel air cycle. 03
(b) List the losses in actual fuel-air cycle and explain any three in detail. 04
(c) Draw a schematic diagram of Bosch type fuel pump and explain its
working.
07
OR
Q.3 (a) Define Rich, Lean and Stoichiometric A:F mixture. 03
(b) Compare Battery and magneto ignition systems. 04
(c) Describe the construction and explain the working of Junkers ? gas
calorimeter.
07
Q.4 (a) Explain detonation in C.I. engine. 03
(b) Give the various types and applications of lubrication and cooling
system in I.C.engine.
04
(c) Explain stages of combustion in C.I. engines. 07
OR
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161902 Date:20/11/2018
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.
MARKS
Q.1 (a) State the function of following I.C.engine components. 14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Cylinder head
Spark plug
Fuel pump
Radiator
Flywheel
Dynamic oil seal
Supercharger
Governor
Piston pin
Piston rings
Combustion chamber
Cam & follower set
Carburetor
Injector
Q.2 (a) Define Air standard, Fuel air and Actual cycle. 03
(b) Explain with a neat sketch the working of two stroke engine. 04
(c) Explain with neat sketch actual valve timing diagram of diesel engine
for law and high speed.
07
OR
(c) Explain with P-V diagram the effect of variable specific heat on Otto,
Diesel and Dual cycle.
07
Q.3 (a) List assumptions for fuel air cycle. 03
(b) List the losses in actual fuel-air cycle and explain any three in detail. 04
(c) Draw a schematic diagram of Bosch type fuel pump and explain its
working.
07
OR
Q.3 (a) Define Rich, Lean and Stoichiometric A:F mixture. 03
(b) Compare Battery and magneto ignition systems. 04
(c) Describe the construction and explain the working of Junkers ? gas
calorimeter.
07
Q.4 (a) Explain detonation in C.I. engine. 03
(b) Give the various types and applications of lubrication and cooling
system in I.C.engine.
04
(c) Explain stages of combustion in C.I. engines. 07
OR
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2
Q.4 (a) Compare liquid and air cooled systems. 03
(b) State the different methods of supercharging and discuss any one of
them with figure.
04
(c) Design the size of the fuel orifice to give an air fuel ratio 13:1. The
venturi throat is 3.5 cm in diameter and the vacuum at the venturi is 6.5
cm of Hg. Take Cda = 0.92 and Cdf = 0.95. The air temperature and
pressure at the carburetor entrance are 1 bar and 293 K. The fuel orifice
is at the same level as that of the float chamber fuel level. Take density
of fuel as 750 kg/m
3
.
07
Q.5 (a) What are the major difficulties to be faced if a single jet carburetor is
used?
03
(b) State two merits and two demerits of diesel engine power plants. 04
(c) A 4-cylinder, 4-stroke petrol engine 6 cm bore and 9 cm stroke was
tested at constant speed. The fuel supply was fixed to 0.13 kg/min and
plugs of 4-cylinders were successively short-circuited without change
of speed. The power measurements were as follows:
With all cylinder working=16.25 kw
With No.1st ?cylinder cut-off =11.55 kw
With No.2nd ?cylinder cut-off =11.65 kw (BP)
With No.3rd ?cylinder cut-off =11.70 kw (BP)
With No.4th ?cylinder cut-off =11.50 kw (BP)
Find (a) The IP of engine (b) Mechanical efficiency (c) Indicated
thermal efficiency if CV of fuel used is 42000 kj/kg.
Assume clearance volume 60 cu.cm.
07
OR
Q.5 (a) Write a short note on air pollution due to IC engines. 03
(b) Explain the method of obtaining I.P. of multi-cylinder engine by Morse
Test.
04
(c) Explain and draw up the heat balance sheet with necessary equations
to represent the heat distribution on minute and percentage basis.
07
*************
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This post was last modified on 20 February 2020