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Wednesday, October 26, 2016



Roll No. ......................
Total No. of Questions : 09]
B.Tech. (Sem. – 4th)
INTERNAL COMBUSTION ENGINES
SUBJECT CODE : AE - 202
Paper ID : [A0708]
Time : 03 Hours
Instruction to Candidates:
1. SECTION-A is COMPULSORY consisting of TEN questions carrying
TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and
students has to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and
students has to attempt any TWO questions.
SECTION-A
l. Write briefly :
a) What do you mean by compression ratio of an engine?
b) How are I.C engines classified?
c) What are the drawbacks of a simple carburettor?
d) Define Cetane number of a fuel.
e) What do you mean by ignition lag?
f) What are the different stages of combustion in CI engine?
g) What are the different methods of turbocharging?
h) What is function of fins and why they are provided?
i) Differentiate between I.H.P. and B.H.P.
j) What are different additives used in lubricants?
SECTION-B
2. Draw the valve timing diagram of two stroke and four stroke engine and
compare them with actual diagrams.
3. Explain the phenomenon of knocking in S.I engine and what is the effect
of various engine variables on S.I engine knock?
4. What are the essential requirements of an automobile carburettor? Explain
any one automobile carburettor with a suitable sketch.
5. What is an air cooling system and in which type of engine it is normally
used?
6. What is the need for supercharging and explain the working of Turbocharger?
SECTION-C
7. A large four stroke cycle diesel engine runs at 2000 r.p.m. The engine
has a displacement of 25 litres and brake mean effective pressure of
0.6MN/m
2. It consumes 0.018 kg/s of fuel and the calorific value of fuel
is 42000 kJ/kg. Determine the brake power and brake thermal efficiency.
8. The following details were noted in a test on four cylinder, four stroke
engine. Diameter = 100 mm,
Stroke = 120mm,
Speed of the engine =1600 r.p.m.,
Fuel consumption = 0.2 kg/min,
Calorific value of fuel = 44000 kJ/kg
Difference in tension on either side of the brake pulley = 40 kg,
Brake circumference = 300 cm.
If the mechanical efficiency is 80 %. Calculate :
i. Brake Thermal efficiency
ii. Indicated thermal efficiency
iii. Indicated mean effective pressure
iv. Brake specific fuel consumption

9. Explain with a suitable sketch Dry sump and Wet sump lubrication system.

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