Many diesel engines have pistons with...

Question 1 / 205eccefa1bacbc34ba4d47535

Question 1 of 205eccefa1bacbc34ba4d47535

Many diesel engines have pistons with concave heads to __________.

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Question 1 of 20

5eccefa1bacbc34ba4d47535

Many diesel engines have pistons with concave heads to __________.

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🔍 Key Concepts

• Diesel engines rely on highly compressed hot air and injected fuel, not a premixed fuel-air charge like gasoline engines • The shape of the piston crown strongly affects airflow motion (swirl/turbulence) in the combustion chamber • Good diesel combustion needs thorough mixing of fuel and air in a very short time

💭 Think About

• Think about what happens in the cylinder just before and during fuel injection—what motion of the air helps the fuel droplets spread and mix? • How would a concave (bowl-shaped) piston head change the path and speed of air moving in the cylinder compared with a flat piston? • Which options describe air motion and mixing, and which focus on afterburning—which is the primary design goal for piston crown shape?

✅ Before You Answer

• Identify which choices talk about air turbulence and fuel mixing versus afterburning effects • Consider whether diesel designers want to increase or decrease air motion near the fuel spray to improve combustion • Ask yourself: in a diesel, is rapid mixing of fuel and air desirable or something to be reduced?

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Question 1 of 20

Many diesel engines have pistons with concave heads to __________.

decrease air turbulence and improve fuel mixing

increase air turbulence and improve fuel mixing

prevent fuel afterburning when injection ends

prolong fuel afterburning when injection ends

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Question 1 / 205eccefa1bacbc34ba4d47535

Question 1 of 205eccefa1bacbc34ba4d47535

Many diesel engines have pistons with concave heads to __________.

Back

Question 1 of 20

5eccefa1bacbc34ba4d47535

Many diesel engines have pistons with concave heads to __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed