Automobile Engineering in ME
A three way catalytic converter

Burns fuel vapour gases
Reduces N₂, H₂O, and CO₂ emission levels
Removes CO, HC, and NO₂ from the exhaust gases passing through it
Re-circulates exhaust gases

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

Less compression ratio gives better performance
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
It makes petrol engines lighter
It is just customary to have less compression ratio in petrol engines

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