What is the purpose of piston rings in engines?
a. To prevent air-fuel mixture leakage from the crankshaft chamber to the oil sump.
b. To prevent air-fuel mixture leakage from the combustion chamber to the oil sump.
c. To prevent oil leakage from the oil sump to the rocker chamber.
b. To prevent air-fuel mixture leakage from the combustion chamber to the oil sump.
c. To prevent oil leakage from the oil sump to the rocker chamber.
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