White smoke coming out of the chimney of a furnace indicates the use o – McqOptions

MCQOPTIONS

1.	White smoke coming out of the chimney of a furnace indicates the use of
A.	low excess air.
B.	very high excess air.
C.	gaseous fuel in the furnace.
D.	liquid fuel in the furnace.
Answer» C. gaseous fuel in the furnace.

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