Pick out the wrong statement.
A. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
B. Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
D. None of these
Answer: Option D
This Question Belongs to Chemical Engineering >> Furnace Technology
Overfire burning in a furnace is a phenomenon characterised by
A. Supply of excess fuel
B. Supply of excess air
C. Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
D. None of these
Which of the following variables does not affect the furnace capacity?
A. Size of the furnace
B. Gas velocity in furnace
C. Ratio of wall surface to surface of stock
D. None of these
__________ is an indirectly heated furnace.
A. Open hearth furnace
B. Muffle furnace
C. Soaking pit
D. Reheating furnace
Reducing atmosphere is maintained in a
A. Calcination kiln
B. Blast furnace
C. Soaking pit
D. L.D. converter
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