GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI EXAMINATION — SUMMER 2020
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Subject Code: 2161902 Date:26/10/2020Subject 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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MARKS
Q.1 (a) State the basic function of piston, piston rings and flywheel. 03
(b) Explain with a neat sketch the working of two stroke petrol engine. 04
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(c) Explain the variation in specific heat and loss due to it in an Otto cycle with the help of P-V diagram 07
Q.2 (a) Make comparison of SI and CI engine. 03
(b) What is scavenging? Explain uniflow scavenging 04
(c) Write a short note on effect of time loss, heat loss and exhaust loss in Petrol and Diesel engines 07
OR
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(c) Explain construction and working of bomb calorimeter. 07
Q.3 (a) Define: HUCR, Octane number and Cetane number. 03
(b) Write short note on adiabatic flame temperature. 04
(c) Discuss various mixture requirement for different loads and speeds 07
OR
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Q.3 (a) List assumptions for fuel air cycle 03
(b) Write the limitations of supercharging SI and CI engines? 04
(c) Explain construction and working of simple carburetor with neat sketch. 07
Q.4 (a) What are the needs of supercharging? 03
(b) Describe the Pintle and Pintaux nozzle with neat sketch and discuss their relative merits & demerits. 04
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(c) Make comparison of battery and magneto ignition system. 07
OR
Q.4 (a) List the desired properties of a coolant. 03
(b) Make comparison of wet and dry sump lubrication system. 04
(c) Draw and explain various stages of combustion in C.I. engine. 07
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Q.5 (a) Classify C.I engine combustion chamber. 03
(b) What are the effects of knocking on engine performance? 04
(c) State and explain effect of variables on ignition delay in SI engine. 07
OR
Q.5 (a) Write a short note on Euro norms. 03
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(b) Explain William’s line method to find friction power. 04
(c) Write short note on catalytic converter. 07
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