Worn main bearings will cause the...

Question 1 / 205eccefa1bacbc34ba4d4760b

Question 1 of 205eccefa1bacbc34ba4d4760b

Worn main bearings will cause the compression ratio of a diesel engine to __________.

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Question 1 of 20

5eccefa1bacbc34ba4d4760b

Worn main bearings will cause the compression ratio of a diesel engine to __________.

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🔍 Key Concepts

• compression ratio definition in a diesel engine (relationship between total cylinder volume and clearance volume at TDC) • effect of main bearing wear on the crankshaft position and how far the piston can travel toward TDC • how a change in clearance volume at TDC affects compression pressure and temperature

💭 Think About

• Visualize the piston at top dead center (TDC) in a new engine: what are the volumes involved in the compression ratio formula? • If the main bearings wear, does the crankshaft centerline move closer to or farther from the cylinder head, and what does that do to how close the piston can get to TDC? • When the piston no longer reaches as high at TDC, does the trapped volume above the piston get larger or smaller, and how does that affect the compression ratio value?

✅ Before You Answer

• Write out the formula: Compression ratio = (Swept volume + Clearance volume) / Clearance volume and decide which term changes with worn main bearings. • Confirm that bore and stroke do not change with bearing wear; only the effective TDC position (and thus clearance volume) is affected. • Be sure you understand that if clearance volume increases, the compression ratio moves in one specific direction only—identify that direction before choosing.

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Question 1 of 20

Worn main bearings will cause the compression ratio of a diesel engine to __________.

increase

decrease

increase on compression; decrease on expansion

remain the same

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Question 1 / 205eccefa1bacbc34ba4d4760b

Question 1 of 205eccefa1bacbc34ba4d4760b

Worn main bearings will cause the compression ratio of a diesel engine to __________.

Back

Question 1 of 20

5eccefa1bacbc34ba4d4760b

Worn main bearings will cause the compression ratio of a diesel engine 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