S.B.
Roll. No. __________
AUTOMOBILE ENGINE -1
3rd Exam/Auto/9307/Dec’11
Time
-3 hrs
Note
: Question No 1 is compulsory.
Draw neat sketches wherever necessary
Note:
Attempt any five questions.
Q.1
Write the correct answer from the given choices:-
(a) The working cycle of a four stroke
engine is completed in the following number of revolutions of
crank shaft: 1/2, 1, 2, 4, 8.
(b) In a diesel engine, fuel is ignited
by:-
spark, injected fuel, heat resulting from compressing the air that
is supplied for combustion, ignitor, combustion chamber.
(c) The calorific value of gaseous fuels is
expressed in terms of:
KCal, KCal/Kg ,
KCal/m sq, KCal/m cube, all of the above.
(d) An engine indicator is used to
determine the following:-
speed, temperature,
volume of cylinder, m.e.p. and IHP, BHP
(e) The specific fuel consumption per BHP
hour for a petrol engine is approximately—
0.15 kg, 0.2 kg,
0.25 kg, 0.3kg, 0.35kg.
Q2. (a) Discuss the various types of cylinder
arrangements available.
(b) State and
explain the importance of engine fan belt.
(c) Discuss four
strokes of a C.I. engine.
Q3 (a)
What do you understand by the terms Top and Bottom dead centres?
(b) Discuss Compression Ratio of a diesel
engine.
Q4
Discuss AC
Mechanical and Electrical Fuel Feed pump of an automobile engine.
Q5 (a) Discuss the requirements of air fuel ratios under the various
load conditions of a Petrol
Engine.
(b) What is the role of a Governor? 5mks
Q6 Draw a schematic sketch of COOLING SYSTEM of a
Diesel engine and name its components.
Q7
(a) Name the various lubrication Systems of
a Petrol Vehicle, discuss any one
(b) What are the essential requirements of
the engine lubricating oils? 7mks
Q8
Write short notes on any three:-
(a) Inlet and Exhaust Manifold
(b) Exhaust Silencers
(c) Valve Timings
(d) Crank Case Ventilation
(e) Thermostat
(f) Fan belt
(g) CB Point Gap
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