MI Boiler Operator Practice Questions - Michigan Boiler Operator License Exam

What does 'excess air' mean in boiler combustion?

Air supplied to the burner beyond the theoretical amount needed for complete combustion Air leaking into the boiler through casing defects The air remaining in the furnace after a pre-purge cycle Air trapped in the boiler water causing corrosion

Correct Answer:

Air supplied to the burner beyond the theoretical amount needed for complete combustion

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