Decrease of air-fuel ratio in spark ignition engines results in – McqOptions

MCQOPTIONS

1.	Decrease of air-fuel ratio in spark ignition engines results in
A.	increase of NOx
B.	a decrease of CO and unburnt hydrocarbon
C.	an increase of CO and unburnt hydrocarbon
D.	none of the above
Answer» D. none of the above

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