Question

What do you mean by the term “Flue gas”?

(a) Dry CO2

(b) Chimney gas

(c) Non-combustible gas

(d) Cold gas

This question was addressed to me in an internship interview.

This question is from Disposal of Effluent in division Effluent Treatment of Bioprocess Engineering

Answer 1

Correct option is (b) Chimney gas

Best explanation: A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. Flue gas is the gas exiting to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants.