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

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

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Automobile Engineering in ME
In which of the following conditions, the idle CO percentage should be measured with the vehicle?

Headlights are switched on
Headlights and other lights are switched off
Headlights and other electrical devices are switched off
Headlights and other electrical devices are switched on

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