Download GTU BE/B.Tech 2019 Summer 4th Sem New 2140203 Automobile Engines Question Paper

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Subject Code: 2140203

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-IV(NEW) - EXAMINATION - SUMMER 2019
Subject Name: Automobile Engines
Time:02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Compare I.C. Engine and E.C. Engine MARKS 03
(b) State reason for early opening of exhaust valve and late closing of inlet valve in 4-stroke Engine. MARKS 04
(c) Draw & explain actual valve timing diagram for 4-stroke petrol engine. MARKS 07

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Q.2 (a) Define following terms (1) choke (2) Idling system (3) Metering rod MARKS 03
(b) Explain the use of CNG as substitute fuel for IC Engine. MARKS 04
(c) Explain working of Simple carburetor with neat sketch. MARKS 07

OR

(c) With a line diagram explain the working of common rail fuel injection system. MARKS 07

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Q.3 (a) Define following terms (i) Ice formation (ii) Vapour lock (iii) Back firing. MARKS 03
(b) Why engine cooling is required? Explain air cooling system for I.C. engine. MARKS 04
(c) Explain splash lubrication system used in automobile engines with neat sketch. MARKS 07

OR

Q.3 (a) Write a short note on antifreeze solutions. MARKS 03

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(b) Give comparison between wet sump and dry sump lubrication system. MARKS 04
(c) Classify cooling system and discuss forced circulation thermo-stat cooling system with neat sketch. MARKS 07

Q.4 (a) What are the different factors that affect the ignition lag in S.I. engine combustion? MARKS 03
(b) What are the different parameter considered to control the knock? MARKS 04
(c) With the help of P-? diagram explain the stages of combustion in S.I. engine. MARKS 07

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OR

Q.4 (a) State effect of supercharging on following parameter (i) Power output (ii) Mechanical efficiency (iii) Fuel consumption. MARKS 03
(b) Write the advantages and limitations of supercharging SI and CI engines? MARKS 04
(c) Explain with neat sketch the constant pressure turbocharging. MARKS 07

Q.5 (a) Write a short note on scavenging pump. MARKS 03

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(b) Explain Willan’s line method for measuring friction power. MARKS 04
(c) Explain the working of 4 stroke petrol engine with neat sketch. MARKS 07

OR

Q.5 (a) What is delay period in C.I engine? Explain importance of delay period. MARKS 03
(b) Draw and explain salient features of open combustion chamber. MARKS 04

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(c) Draw and explain cross scavenging. What are its merits and demerits? MARKS 07

Date:25/05/2019
Total Marks: 70