A device in which some portion of waste heat of flue gases is recovere – McqOptions

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1.	A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as$?
A.	Superheater
B.	Air-preheater
C.	Economizer
D.	Injector
Answer» C. Economizer

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