NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

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During a combustion analysis, a high carbon monoxide reading with a low carbon dioxide reading most nearly indicates which condition?

Complete combustion with correct excess air. A perfect condensing boiler at 98 percent AFUE. That the relief valve is undersized. Incomplete combustion from poor mixing, a dirty burner, or insufficient air.

Correct Answer:

Incomplete combustion from poor mixing, a dirty burner, or insufficient air.

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