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Test Your Knowledge on Engine Knock and Detonation

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Test Your Knowledge on Engine Knock and Detonation

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Questions and Answers

What is detonation?

The process of cooling down the engine after use

Part of the air/fuel mixture exploding outside the normal combustion front (correct)

The sound made by the engine when it's running

Part of the air/fuel mixture exploding within the normal combustion front

What is the effect of detonation on cylinder pressure?

Increases cylinder pressure dramatically (correct)

Has no effect on cylinder pressure

Increases cylinder pressure slightly

Decreases cylinder pressure

How can detonation be prevented in an engine?

By reducing exhaust gas recirculation

By increasing compression ratio

By increasing peak combustion chamber temperatures

By controlling peak combustion chamber temperatures, compression ratio reduction, exhaust gas recirculation, ignition timing schedule, and careful design of the engine's combustion chambers and cooling system (correct)

Which element added to certain fuels can suppress detonation?

Lead Signup and view all the answers

What is the effect of water injection on knock in engines?

Reduces knock Signup and view all the answers

Which type of paraffins resist knock?

Branched chain paraffins Signup and view all the answers

What is the effect of turbulence on knock in engines?

Reduces knock Signup and view all the answers

What causes a different kind of knock in diesel engines?

Fast rate of pressure rise Signup and view all the answers

Study Notes

Detonation occurs when part of the air/fuel mixture explodes outside the normal combustion front
This creates a metallic "pinging" sound and increases cylinder pressure dramatically
Effects range from inconsequential to destructive, damaging engine components
Detonation can be prevented by controlling peak combustion chamber temperatures, compression ratio reduction, exhaust gas recirculation, ignition timing schedule, and careful design of the engine's combustion chambers and cooling system
Lead and thallium added to certain fuels can suppress detonation
Knock is less common in cold climates and water injection system can be used to reduce peak temperatures
Branched chain paraffins resist knock while straight chain paraffins knock easily
Turbulence has a significant effect on knock, engines with good turbulence tend to knock less
Diesel engines suffer from a different kind of knock caused by a fast rate of pressure rise
Careful design of injector pump, fuel injector, combustion chamber, piston crown, and cylinder head can reduce knocking in diesel engines

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Description

Think you know everything about engine knock and detonation? Test your knowledge with this quiz! Learn about the causes and effects of engine knock, and discover the various methods to prevent it from happening. From controlling peak temperatures to fuel additives, this quiz covers all the ways to keep your engine running smoothly. Whether you're a car enthusiast or a mechanic, this quiz is sure to challenge your understanding of engine knock and detonation.