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Tuesday, August 30, 2016






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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