Automotive and Combustion Engine Technology(Department Elective III) — Winter 2022

Explain tail pipe emission formed by combustion of gasoline in brief.

Enlist advance technologies employed in gasoline engine to enhance fuel economy.

Explain concept and working of direct injection gasoline engine with neat s ketch.

What do you mean by turbo lag? Explain in brief.

Explain in brief concept of Lean NOx trap.

Explain concept and technology variable valve timing (VVT) in details. Also give advantages of it.

Explain urea-based SCR NO after treatment strategy to control NO . x x

Define delay period in brief.

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

Describe stages of combustion of CI engine with pressure-theta (crank angle) diagram.

Differentiate between internal exhaust gas recirculation system and external exhaust gas recirculation system.

Explain NO formation mechanism. x

Explain the reasons for knocking and abnormal combustion with turbocharging in SI engine?

Explain in brief concept of lean boost (LBDI) combustion system.

Describe the need of a cam profile switching (CPS) mechanism in conjunction with twin independent variable cam timing (VCT) devices in SI and controlled auto ignition operation in a gasoline engine.

Explain principle of auto ignition combustion in gasoline engine.

Enlist the limitation of HCCI combustion

Explain implications of fuel injection timing on combustion.

Describe problems associated with turbo-charging the SI engine.1

Explain in brief implications of EGR on exhaust emission of gasoline engine.

Explain operation of gasoline auto ignition combustion with thermal management.

What are the advantages of combining direct injection and turbo charging in Spark-ignition engine.

Write disadvantages of super-charging.

Differentiate between carburation, MPFI and GDI technologies.

Explain concept of downsizing with one illustration.