Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?

A. % of CO2 in

B. Temperature of

C. Colour of

D. % of O2in

Found an error? Read our corrections policy and submit a sourced correction below. You can also share a useful explanation in your own words.

Discuss the answer or suggest a sourced correction
Thank you for contributing.
Your comment was submitted and will appear after editorial review.

Your email is used only for moderation and is never displayed. Spam, copied material and fabricated endorsements are rejected.