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

FirstRanker.com

GUJARAT TECHNOLOGICAL UNIVERSITY

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

--- Content provided by⁠ FirstRanker.com ---

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

--- Content provided by‌ FirstRanker.com ---

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)

   --- Content provided by‍ FirstRanker.com ---

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)

--- Content provided by⁠ FirstRanker.com ---

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

--- Content provided by‌ FirstRanker.com ---

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)

   --- Content provided by FirstRanker.com ---

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

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

--- Content provided by‍ FirstRanker.com ---

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)

--- Content provided by FirstRanker.com ---

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)

   --- Content provided by FirstRanker.com ---

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)

   --- Content provided by FirstRanker.com ---

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

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

--- Content provided by FirstRanker.com ---

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

FirstRanker.com

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)

--- Content provided by FirstRanker.com ---

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)

--- Content provided by‌ FirstRanker.com ---

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)

FirstRanker.com

--- Content provided by⁠ FirstRanker.com ---