Automobile Engineering in ME
The function of oil control rings is that it

Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Lubricates the cylinder wall by releasing oil from its hole
Keeps the cylinder wall lubricated by holding oil in its channel
Maintains a seal and prevents escape of burned gases and oil leakage

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface
Creates a standing wave
Bounces vertically or deflects from side to side (as seen from front or rear)
Deflects in the vehicle's longitudinal direction

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Feeds blow by gases to the exhaust manifold
Returns blow by gases from the crankcase to the intake system
Promotes combustion by creating a swirling movement in the air-fuel mixture
Mixes fuel with air

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