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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER -III• EXAMINATION SUMMER 2017
Subject Code: 330203 Date: 03 05 2017
Subject Name: Automobile 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.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1

Differentiate between S.I engine and C.I engine.
07

S .I C .I
07

Define following Technical terms used in an engine.
T.D.C B.D.C Stroke B.H.P F.H.P Clearance volume Swept volume.

T. D .C B .D .C B .H..P F. H.. P

Q.2

Give the materials for following: Piston Piston ring Cylinder liner Piston pin Crank shaft connecting rod Cylinder head.
07


07

Draw the actual valve timing diagram of a 4-stroke cycle petrol engine and explain.



OR

Explain the importance of valve overlap period in valve timing. Give its numerical value.
07

Q.3

Explain the combustion process in C.I engine.
07

C.I
07

Explain M.P.F.I system with line diagram.

M .P.F.I

OR
Q.3

Explain various stages of combustion in SI engine.
07
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07

Explain normal and abnormal combustion in SI engine with the help of neat sketch.



Q.4

Enlist the function of F.I pump and explain any one type of F.I pump.
07

F.I
07

Explain simple carburetor with neat sketch.



OR
Q.4

Write short note: Pre-ignition Detonation.
07


07

List types of cooling system and explain pressurized cooling system.




Q.5

Write a short note on Turbo charger.
07


07

Enlist different types of lubricating oil pump and explain any one.



OR
Q.5

Write a short note on Supercharger.
07


07

Enlist properties of Engine oil.