Unit 5: Supercharging in IC Engines

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What is the purpose of supercharging an engine?

To decrease engine power output

To reduce the amount of oxygen available for combustion

To increase fuel consumption

To raise the density of the air charge before entering the cylinders (correct)

How does supercharging impact the amount of air and fuel per cycle in a cylinder?

Does not affect the amount of air and fuel

Increases the amount of air and fuel (correct)

Decreases the amount of air and fuel

Halts the supply of air and fuel

What is the result of compressing air during supercharging on an engine's power output?

Halts the engine's power output

Increases engine power output (correct)

Decreases engine power output

Has no impact on engine power output

What is the purpose of a small displacement engine in the context of emission legislation?

To decrease emissions Signup and view all the answers

How does supercharging an engine affect the mass of air induced into the cylinders?

Increases mass of air induced Signup and view all the answers

What happens to a certain percentage of power in supercharging an engine?

It leads to some power loss Signup and view all the answers

What is a limitation of supercharging on engine parts?

Greater tendency to burn the piston crown and exhaust valves Signup and view all the answers

How does turbocharging differ from traditional supercharging?

Turbocharging does not have a mechanical linkage between the engine and supercharger Signup and view all the answers

What part of the engine is typically made of better materials in engines using supercharging?

Piston crown and exhaust valves Signup and view all the answers

Why is a greater valve overlap necessary in supercharged engines?

To assist in cooling the piston crown and exhaust valves Signup and view all the answers

How does a turbocharger generate compressed air for the engine cylinder?

By using a turbine wheel driven by exhaust gases to spin a compressor wheel Signup and view all the answers

What is the purpose of the valve overlap in supercharged engines?

To assist in cooling the exhaust valves and piston crown Signup and view all the answers

Why does valve overlap need to vary in supercharged engines?

To maximize cooling effect on engine components Signup and view all the answers

What phenomenon is associated with a short delay in boost or manifold pressure increase in turbocharged engines?

Turbolag Signup and view all the answers

What is the main purpose of a supercharger in an engine?

Boost power output Signup and view all the answers

Which type of supercharger is commonly used in automotive engines?

Centrifugal type Signup and view all the answers

What material is commonly used to make impellers in superchargers?

Aluminum Signup and view all the answers

In a Root's supercharger, how do the rotors rotate?

At the same speed Signup and view all the answers

What is a common issue associated with vane type superchargers?

Wear of vane tips Signup and view all the answers

Which method of supercharging involves using an independently driven compressor?

Ram effect Signup and view all the answers

What is a key consideration when choosing a supercharger type for an application?

Maintenance requirements Signup and view all the answers

Why is it important for an impeller in a centrifugal supercharger to withstand high stresses?

"Because it rotates at very high speeds" Signup and view all the answers

What component in the turbocharger assembly limits the maximum boost pressure to prevent detonation and engine damage?

Waste gate Signup and view all the answers

What is the role of a waste gate in a turbocharging system?

Limits maximum boost pressure Signup and view all the answers

What is a key advantage of supercharging in terms of engine performance?

Instant power delivery Signup and view all the answers

What type of engine can maintain higher power levels at higher altitudes due to its forced induction system?

Supercharged engine Signup and view all the answers

Which type of engine is known for providing better performance at altitude due to its ability to maintain high power levels?

Supercharged engine Signup and view all the answers

What contributes to the improved fuel efficiency associated with superchargers?

Instant power delivery Signup and view all the answers

Which type of losses in an engine does the friction power account for?

Both pumping and friction losses Signup and view all the answers

What causes the pumping loss in an internal combustion engine during the inlet and exhaust stroke?

'Moving the piston against gaseous pressure' Signup and view all the answers

What is the main drawback of Willan's line method?

Long distance to be extrapolated towards the zero line of fuel input Signup and view all the answers

How does the Morse test render a cylinder inoperative in a gasoline engine?

Shorting the spark plug Signup and view all the answers

Which method is also known as the fuel rate extrapolation method?

Willan's Line Method Signup and view all the answers

What does the unshaded area of the indicator diagram represent in the Morse test?

Gross power developed by the engine Signup and view all the answers

In Willan's line method, what does the negative intercept of the x-axis represent?

Work representing combined losses due to friction, pumping, and blow by Signup and view all the answers

What is the main limitation of the Morse test?

Assumes pumping and friction losses are equal when a cylinder is inoperative Signup and view all the answers

According to Willan's line method, when bp = 0 (brake power equals zero), what does the engine consume?

A certain amount of fuel Signup and view all the answers

Why is it important to take many readings at light loads in Willan's line method?

To establish the true nature of the curve Signup and view all the answers

What does $5(7 + 3)$ equal to?

30 Signup and view all the answers