The upper edges of the piston rings, shown...

Question 1 / 270705eccefa1bacbc34ba4d47547

Question 1 of 270705eccefa1bacbc34ba4d47547

The upper edges of the piston rings, shown in the illustration are rounded off to __________. See illustration MO-0015.

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Question 1 of 27070

The upper edges of the piston rings, shown in the illustration are rounded off to __________. See illustration MO-0015.

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🔍 Key Concepts

• Function of piston rings in sealing and scraping • Effect of sharp vs rounded edges on ring movement in the groove • How ring edge shape influences lubrication and wear

💭 Think About

• Consider what happens to gas pressure and carbon deposits around a sharp-edged ring versus a rounded edge when the piston moves up and down • Think about which problem is most likely to occur if the ring edge digs into the groove or cylinder wall instead of sliding smoothly • Ask yourself which option directly relates to how easily the ring can move and conform to the cylinder wall during operation

✅ Before You Answer

• Identify which choice is most closely related to free ring movement in the groove • Eliminate options that focus only on strength without mentioning movement or sealing • Consider which option would help avoid sticking due to carbon, varnish, or side pressure in actual engine operation

Question 1 of 27070

The upper edges of the piston rings, shown in the illustration are rounded off to __________. See illustration MO-0015.

obtain increased strength

reduce oil pumping

keep the ring from sticking in the grove

reduce the probability of ring fracture