Which of the following reasons represents...

Question 1 / 270705eccefa1bacbc34ba4d47361

Question 1 of 270705eccefa1bacbc34ba4d47361

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

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Question 1 of 27070

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

🔍 Key Concepts

• Difference between spark-ignition (gasoline) and compression-ignition (diesel) engines • Role of compression ratio in causing temperature rise and potential pre‑ignition/knock • How the fuel is ignited in gasoline vs diesel engines

💭 Think About

• Ask yourself: In a gasoline engine, what actually starts the combustion process, and do we rely on high compression heat for ignition? • Consider what happens if you raise the compression ratio too high in a gasoline engine that uses a spark plug—what type of abnormal combustion can occur? • In a diesel engine, why is a very high compression ratio essential, and how is this different from the requirement in a gasoline engine?

✅ Before You Answer

• Be clear on whether compression heat is or is not supposed to ignite the fuel in a gasoline engine. • Think about which option confuses cause and effect (for example, does low compression make spark ignition ‘effective,’ or is compression limited for another reason?). • Eliminate any answers that sound like they are describing how a diesel engine works rather than why a gasoline engine’s compression ratio must be lower.

Question 1 of 27070

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

Compression must be low to have effective pre-ignition.

The heat of compression is not used as an ignition source of the fuel.

Compression must be low for effective spark ignition.

Compression must be low for smooth operation.

Question 1 / 270705eccefa1bacbc34ba4d47361

Question 1 of 270705eccefa1bacbc34ba4d47361

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

Back

Question 1 of 27070

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?