GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Code:2161902
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
Subject Name:Internal Combustion Engines
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) State the function of following I.C.engine components. | 14 |
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| Q.2 | (a) Define Air standard, Fuel air and Actual cycle. | 03 |
| (b) Explain with a neat sketch the working of two stroke engine. | 04 | |
| (c) Explain with neat sketch actual valve timing diagram of diesel engine for law and high speed. | 07 | |
| OR | ||
| (c) Explain with P-V diagram the effect of variable specific heat on Otto, Diesel and Dual cycle: | 07 | |
| Q.3 | (a) List assumptions for fuel air cycle. | 03 |
| (b) List the losses in actual fuel-air cycle and explain any three in detail. | 04 | |
| (c) Draw a schematic diagram of Bosch type fuel pump and explain its working. | 07 | |
| OR | ||
| (a) Define Rich, Lean and Stoichiometric A:F mixture. | 03 | |
| (b) Compare Battery and magneto ignition systems. | 04 | |
| (c) Describe the construction and explain the working of Junkers’ gas calorimeter. | 07 | |
| Q.4 | (a) Explain detonation in C.I. engine. | 03 |
| (b) Give the various types and applications of lubrication and cooling system in I.C.engine. | 04 | |
| (c) Explain stages of combustion in C.I. engines. | 07 | |
| OR | ||
| (b) State the different methods of supercharging and discuss any one of them with figure. | 04 | |
| (c) Design the size of the fuel orifice to give an air fuel ratio 13:1. The venturi throat is 3.5 cm in diameter and the vacuum at the venturi is 6.5 cm of Hg. Take Cd,air = 0.92 and Cd,fuel = 0.95. The air temperature and pressure at the carburetor entrance are 1 bar and 293 K. The fuel orifice is at the same level as that of the float chamber fuel level. Take density of fuel as 750 kg/m3. | 07 | |
| Q.5 | (a) What are the major difficulties to be faced if a single jet carburetor is used? | 03 |
| (b) State two merits and two demerits of diesel engine power plants. | 04 | |
| (c) A 4-cylinder, 4-stroke petrol engine 6 cm bore and 9 cm stroke was tested at constant speed. The fuel supply was fixed to 0.13 kg/min and plugs of 4-cylinders were successively short-circuited without change of speed. The power measurements were as follows: | 07 | |
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| OR | ||
| (a) Write a short note on air pollution due to IC engines. | 03 | |
| (b) Explain the method of obtaining I.P.-of multi-cylinder engine by Morse Test. | 04 | |
| (c) Explain and draw up the heat balance sheet with necessary equations to represent the heat distribution on minute and percentage basis. | 07 |
Date:20/11/2018
Total Marks: 70
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