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← ScienceWhich risk increases when a heat engine cylinder reaches its designed temperature limit?
A)Piston ring thermal expansion✓
B)Volumetric efficiency decreases
C)Fuel auto-ignition probability lowers
D)Exhaust valve seat improves
💡 Explanation
Excessive temperatures cause piston ring thermal expansion, potentially leading to engine seizure because the tight tolerances increase friction; therefore, thermal expansion generates elevated risk, rather than decreased efficiency or improved exhaust sealing at the valve seats.
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