Automobile Engines — Summer 2025

In what respect four stroke cycle CI engine differ from that of an SI engine?

Draw the otto cycle on p-Vand T-s diagrams and mark the various processes.

Explain Valve timing diagram for 4-stroke C. I. Engine with neat sketch.

What are different air fuel mixture on which an engine can be operated?

Explain working principle of Mechanical fuel pump with neat sketch.

With a neat sketch explain the working principle of a simple carburetor.

Explain throttle body injection system with neat sketch.

Give difference between Air and solid injection system.

Enlist properties of C.Iengine fuels & define any three.

Draw a schematic diagram of fuel feed pump and explain its working principle.

What is the purpose of using a governor in CI engines? What are the two major type of governors?

What is the purpose of a fuel injector? Mention the various parts of an injector assembly.

Explain construction and working of Fuel Injector with neat sketch.

What are the various components to be lubricated in an engine?

Compare the wet sump and dry sump lubrication system.

Enlist types of cooling system & explain Thermo-syphon cooling system with neat sketch.

What is delay period and what are the factors that affect it?

Explain factors affecting flame propagation in C.I. Engine.

Explain the stages of combustion with P-θ diagram in S.I. engines

How does the actual scavenging process differ from the theoretical one? Explain by means of suitable graph.

What is meant by supercharging? What is its effect on engine performance?

What is turbocharging? State the types of turbocharging and explain any one with neat sketch.

Explain the principle involved in the measurement of brake power.

Briefly discuss the various efficiency terms associated with an engine.

With a neat sketch, explain an Eddy current dynamometer.