Automotive and Combustion Engine Technology(Department Elective III) — Summer 2023

What is Engine downsizing?

What is lean boost direct injection (LBDI) concept?

Describe the urea-based SCR NOx after treatment with schematic diagram.

What is Micro Hybrid & Mild Hybrid Vehicle?

What is stratified charge operation in case of gasoline direct injection?

Explain working of Direct Injection Gasoline Engine with schematic diagram.

Explain the wall, air and spray combustion system for the mixture preparation of gasoline direct injection.

What is turbo charging? What is the advantage of turbo charging in SI engine?

Explain EGR with the neat sketch.

With a neat sketch explain thermodynamic analysis of gasoline direct injection at part-load condition.

Define : Atkinson cycle and Miller cycle.

Write the advantages of gasoline direct injection in terms of efficiency in a real engine.

What is auto ignition phenomenon? What is the basic difference between auto ignition combustion and SI combustion?

What is internal exhaust gas recirculation system and external exhaust gas recirculation system?

Which are the modifications required to change from SI combustion to auto ignition combustion?

What are the approaches to auto ignition combustion operation in gasoline engines? Explain any two in detail.

Give the difference between turbocharging and supercharging.

Enlist the methods to reduce knock and abnormal combustion of an SI engine with turbocharging.

Describe the operation of gasoline engines with autoignition combustion.

Explain basic principle of HCCI combustion.

Enlist the controlling parameters for HCCI combustion for best fuel economy and low emissions in SI engine.

Differentiate homogenous combustion and diffusion combustion based on any seven aspects.

Enlist the limitation of HCCI combustion.

Compare emissions with HCCI and CI engine operation.

Explain stages of combustion of HCCI engine.