ASE H1 CNG Engines (Transit Bus) Practice Questions - ASE H1 - Compressed Natural Gas (CNG) Engines (Transit Bus) Certification Exam

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Technician A says a stoichiometric CNG transit-bus engine runs at an air-fuel ratio near lambda 1.0 so a three-way catalyst can work. Technician B says these engines always run lean-burn for emissions. Who is correct?

Technician B only Technician A only Both A and B Neither A nor B

Correct Answer:

Technician A only

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