Automobile Engineering in ME
The most effective method of controlling S.I. engine exhaust emission is by

Recirculating exhaust
None of these
Using some additives in the fuel
Using catalytic converter

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced by the passage of a spark
Ignition induced to supplement the process of normal combustion
Automatic ignition of the charge at the end of compression
Ignition of the charge before the passage of flame front

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