Automobile Engineering in ME
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

Stoichiometric mixture
Most economical mixture
Too rich mixture
Too lean mixture

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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 on
Headlights and other electrical devices are switched off

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