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

High atmospheric temperature combustion
High temperature combustion
Low temperature combustion
Incomplete combustion

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

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

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