Q.1
14 Marks(a)
Explain valve timing diagram of four stroke petrol engine.
(b)
Give the name of Scavenging methods and explain any one.
Gujarat Technological UniversitySummer 2025 examination
GTU 2161902 Internal Combustion Engines Summer 2025 Question Paper & PDF
B.E. · Mechanical Engineering · Semester 6 · Subject code 2161902
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Explain emission from CI engine.
(b)
Types of losses in actual fuel- air cycle and explain any two.
OR
(b)
Describe the construction and explain the working of Junkers’ gas calorimeter.
Q.3
14 Marks(a)
Explain
1)Willan’s line method for engine testing.
2)Difference between Euro norms and Bharat stage norms.
(b)
Explain characteristics of SI engine fuel
OR
(a)
Define Rich, Lean and Stoichiometric A: F mixture.
(b)
Explain solex carburetor with neat
Q.4
14 Marks(a)
Define
1)Thermal efficiency
2)Indicated power
3)Mechanical
efficiency
4)Brake power
(b)
Explain battery ignition system with neat sketch.
OR
(a)
Give the name of supercharging methods and explain any one.
(b)
Explain effect on engine variables on knock or detonation.
Q.5
14 Marks(a)
Types of lubrication system and explain splash lubrication system.
(b)
Explain indicated power by morse test.
OR
(a)
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: With all cylinder working=16.25 kw With No.1st –cylinder cut-off =11.55 kw With No.2nd –cylinder cut-off =11.65 kw (BP) With No.3rd –cylinder cut-off =11.70 kw (BP) With No.4th –cylinder cut-off =11.50 kw (BP) Find (a) The IP of engine (b) Mechanical efficiency (c) Indicated thermal efficiency if CV of fuel used is 42000 kj/kg. Assume clearance volume 60 cu.cm.
(b)
Explain different components used in MPFI engine.
Other Semester 6 subjects
BE Mechanical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Internal Combustion Engines (Summer 2025, B.E. · Mechanical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.