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Chemical Engineering - Furnace Technology

Exercise : Furnace Technology - Section 3
26.
Pick out the wrong statement.
Addition of methane to the furnace atmosphere reduces decarburising by hydrogen.
Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures.
Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Which one is not an induced draught furnace?
Blast furnace stove
Sintering furnace
High pressure boiler
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Overfire burning in a furnace is a phenomenon characterised by
supply of excess fuel.
supply of excess air.
burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
premix
outside mixing type
rotary
diffusion
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Neutral atmosphere is maintained in a/an __________ furnace.
cold rolled steel coil annealing
open hearth
soaking pit
walking beam reheating
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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