GUJARAT TECHNOLOGICAL UNIVERSITY
SEMESTER-VI(OLD) - EXAMINATION - SUMMER 2019
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Subject Code:161902 Date:16/05/2019
Subject Name: Internal Combustion Engines
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define IC Engine. Give Comparison between external & internal combustion engine (07)
(b) Explain Effect of variable specific heat on air standard cycles of diesel Cycle with P-V & T-S diagram. (07)
Q.2 (a) Derive the equation for air standard efficiency of an Otto cycle. (07)
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(b) Define following terms. (07)
- Compression Ratio.
- Clearance volume
- Calorific value. (C.V.)
OR
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(b) Define adiabatic flame temperature & explain it with a neat sketch. (07)
Q.3 (a) Explain construction & working of Boy’s gas Calorimeter with neat sketch. (07)
(b) Write Requirements of a good carburetor. Explain working of a simple carburetor. (07)
OR
Q.3 (a) MPFI system for modern Automobile Engines- explains its types with a neat sketch. (07)
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(b) What are different types of fuel injection system? Explain CRDI system for diesel engine. (07)
Q.4 (a) Explain Types of ignition system & advantages & disadvantages of Battery Coil ignition system. (07)
(b) Define supercharging. Explain any one method of supercharging of IC engine with neat sketch. (07)
OR
Q.4 (a) Define combustion. Explain combustion phenomena of SI engine with P-? diagram. (07)
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(b) Write short note on effect of Engine variable on flame propagation. (07)
Q.5 (a) Why governing system is required for IC engine? Explain Hit and Miss governing method for Gas Engine with neat sketch. (07)
(b) What do you mean by turbocharging? Explain in detail the working of pulse turbocharging. (Buchi Type) (07)
OR
Q.5 (a) Explain the Rope brake dynamometer method for measurement of brake power (B.P) (07)
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(b) Write down steps for performance test of IC Engine in laboratory. (07)
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