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Incomplete combustion can be best judged by

A. Smoky chimney exit

B. Excess air in flue gases

C. Measuring carbon monoxide in flue gases

D. Measuring temperature of flue gases at exit of furnace

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  3. Superheating of steam is done at
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  18. A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through…
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