Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 3

26. 

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

Explanation:

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27. 

Which one is not an induced draught furnace?

A. Blast furnace stove
B. Sintering furnace
C. High pressure boiler
D. None of these

Answer: Option A

Explanation:

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28. 

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.

Answer: Option C

Explanation:

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29. 

If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

A. premix
B. outside mixing type
C. rotary
D. diffusion

Answer: Option A

Explanation:

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30. 

Neutral atmosphere is maintained in a/an __________ furnace.

A. cold rolled steel coil annealing
B. open hearth
C. soaking pit
D. walking beam reheating

Answer: Option A

Explanation:

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