Download GTU BE/B.Tech 2019 Winter 8th Sem New 2180215 Automotive And Combustion Engine Technology Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER- VIII (New) EXAMINATION - WINTER 2019

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Subject Code: 2180215

Subject Name: Automotive And Combustion Engine Technology

Time: 02:30 PM TO 05:00 PM

Date: 25/11/2019

Total Marks: 70

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Instructions:

• Attempt all questions.
• Make suitable assumptions wherever necessary.
• Figures to the right indicate full marks.

1. Q.1 Describe pollutants formed by combustion of gasoline in brief. (03)

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2. Q.2 Explain in brief advance technologies employed in gasoline engine to improve fuel economy. (04)

3. Q.3 Define term Downsizing. Explain any one method of downsizing. (07)

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4. Q.4 Explain the need of after cooler in case of exhaust gas recirculation (EGR). (04)

5. Q.5 Explain in brief concept of EGR with schematic diagram. (07)

OR

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1. Q.3 Explain turbocharged direct injection (TDI) with schematic diagram. (07)

2. Q.4 List out exhaust emission control techniques. Explain urea-based SCR NOx after treatment technique. (03)

3. Q.5 Define Ignition lag in brief. (04)

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1. 1. Explain gasoline auto ignition combustion through residual gas trapping approach. (07)

2. 2. Describe combustion phenomenon of gasoline engine. (03)

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OR

1. 1. What is internal exhaust gas recirculation system and external exhaust gas recirculation system? (04)

2. 2. Explain different types of direct injection gasoline injectors. (07)

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1. (2) Explain wall guided and spray guided direct injection combustion system. (03)

2. (b) Explain in brief concept of lean boost combustion system. (04)

3. © Explain operation of gasoline auto ignition combustion with thermal management. (07)

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OR

1. (2) Describe problems and challenges associated with turbo-charging the SI engine. (03)

2. (b) Write disadvantages of wall guided direction injection system. (04)

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3. © Explain operational limitation of HCCI combustion. (07)

1. (2) Explain working principle of auto ignition combustion in gasoline engine. (03)

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2. (b) Explain in brief influences of EGR on exhaust emission of turbo charged diesel engine. (04)

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1. Q5 (a Explain the need of independent variable cam timing (VCT) device in SI and controlled auto ignition operation in a gasoline engine? (04)

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2. (b) Write a short note on homogeneous charge compression ignition (HCCI) diesel engine. (07)

OR

1. © Compare multi point fuel injection and gasoline direct injection system. (03)

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2. (2) Describe any one approach to HCCI operation in gasoline engines. (04)

3. (b) Explain working of direct injection gasoline engine with neat sketch. (07)

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