Download GTU BE/B.Tech 2018 Winter 8th Sem New 21802102180215 Automptive And Combustion Engine Technology Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. (a) What is engine downsizing? [03]
2. (b) How is stratified charge combustion achieved? [04]

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3. (c) What are the types of nozzle used in gasoline direct injection? Also explain their constructional features. [07]

Q.2

1. (a) What is lean boost direct injection (LBDI) concept? [03]
2. (b) Explain Lean NOx trap [04]
3. (c) What are the problems associated with turbo charging the spark-ignition engine? Explain any two of the problems in detail. [07]

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OR

1. (c) Describe the three combustion concepts (wall, air and spray) for the implementation of mixture preparation of gasoline direct injection [07]

Q.3

1. (a) Write short notes on exhaust emission. [03]
2. (b) Explain the salient features of the first-generation [04]

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3. (c) Describe the different approaches to HCCI operation in gasoline engines? [07]

OR

1. (a) Write short notes on exhaust gas treatment on fuel economy. [03]
2. (b) Explain the salient features of the second-generation [04]
3. (c) With a neat sketch explain thermodynamic analysis of gasoline direct injection at part-load condition. [07]

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Q.4

1. (a) Write short notes on engine-knock [03]
2. (b) Mention the advantages of direct injection system. [04]
3. (c) Describe how the selective catalytic reduction (SCR) NOx control as an alternative to lean NOx traps (LNT). [07]

OR

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1. (a) Draw a diagram of a typical DI gasoline engine with sensors and control [03]
2. (b) Explain the conventional diesel combustion with a neat sketch. [04]
3. (c) Explain the principle of autoignition combustion in the gasoline engine. [07]

Q.5

1. (a) What is turbo charging? [03]

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2. (b) With a neat sketch explain the process of turbo charging? [04]
3. (c) Describe the different approaches to HCCI operation in gasoline engines? [07]

OR

1. (a) Explain the thermodynamic aspects of gasoline direct injection [03]
2. (b) Differentiate turbo charging and super charging. [04]

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3. (c) Describe the fundamental principle of HCCI combustion in gasoline engines. [07]

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