Automobile Engineering in ME
The main function of an exhaust muffler is the

Reduction of the exhaust gas volume
Reduction of nitrogen oxide in the exhaust gases
Optimization of exhaust efficiency
Reduction of exhaust noise

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

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

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