Automobile Engineering in ME
The condition that results in large quantities of CO emission is

Insufficient fuel during combustion
Low temperature combustion
Insufficient air during combustion
High temperature combustion

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

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

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