Internal Combustion Engines (ME-501) - Important Questions

Differentiate Otto cycle and Diesel cycle and derive expressions for thermal efficiency, work done and mean effective pressure of the Diesel cycle.

A four-stroke, eight-cylinder engine is tested running at $3600$ r.p.m. The inlet air temperature is $5^{\circ}C$ and the pressure is $760$ mm of Hg. The total piston displacement volume is $4066$ cm$^{3}$. The air fuel ratio of the engine is $14$:$1$ and b.s.f.c is $0.38$ kg/kwh. The power output is $86$ kw. Find the volumetric efficiency of the engine.

Numerically determine the thermal efficiency of a Diesel cycle engine from given bore, stroke, clearance volume and cut-off, and the efficiency loss due to delayed cut-off.

Discuss the importance of firing order with respect to engine balancing, vibration reduction, and crankshaft design.

Discuss the term knock in SI engine. What are the effects of knock. Also discuss the methods to reduce detonation.

Express the factors affecting delay period in CI Engine, in detail. Justify it with suitable reason.

What do you understand by Theory of Carburetion? Explain in detail.

Describe working principle of fuel pump and fuel injectors.

What do you understand by Nozzle? Define its type.

Explain in detail the construction, working and disadvantage of TBL.

Describe the term carburetor. Explain the working of Solex carburetor.

Explain alternative fuels for SI and CI Engine. Explain the fuel characteristics of LPG, CNG and hydrogen.

Explain the methods of supercharging in IC engines. Also explain the engine modifications required for supercharging.

Explain how electronic control improves boost pressure regulation, engine safety and fuel efficiency?

Discuss the lubrication system of SI engine. Highlight the importance of lubrication and its components.

Compare Homogeneous Charge Compression Ignition Engine, Lean Burn Engine & Stratified Charge Engines with respect to combustion process, efficiency, emissions and practical usages.