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Chemical Engineering
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Refractory Technology
Comments
Question
Roof of a basic open hearth furnace is lined with __________ bricks.
Options
A. silica
B. fireclay
C. dolomite
D. magnesite
Correct Answer
silica
Refractory Technology problems
Search Results
1. Grog addition in fireclay during brick manufacture is done to
Options
A. reduce its shrinkage on heating.
B. impart greater spalling resistance.
C. enhance the strength of fired refractories.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
2. To resist spalling tendency, a refractory should have
Options
A. greater diffusivity.
B. low specific heat.
C. low thermal co-efficient of expansion.
D. all (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
3. Chrome magnesite brick is not used for lining the
Options
A. hearth of soaking pits.
B. bottom hearth of reheating furnace.
C. coke oven regenerator.
D. burning zone of limestone rotary kilns.
Show Answer
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Discuss
Correct Answer: coke oven regenerator.
4. Rate of slag attack on refractories increases with rise in temperature due to the
Options
A. decreased viscosity of slag.
B. increased thermal conductivity of brick.
C. oxidising condition in the furnace.
D. none of these.
Show Answer
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Discuss
Correct Answer: decreased viscosity of slag.
5. Semi-silica bricks compared to silica bricks have
Options
A. less fusion point.
B. better spalling resistance.
C. both (a) and (b).
D. neither (a) not (b).
Show Answer
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Discuss
Correct Answer: both (a) and (b).
6. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?
Options
A. High refractoriness.
B. High resistance to spalling.
C. High strength and density.
D. All (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: High refractoriness.
7. Spalling tendency of refractories is reduced by increasing its
Options
A. porosity
B. specific gravity
C. thermal conductivity
D. strength
Show Answer
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Discuss
Correct Answer: porosity
8. Colour of fireclay bricks is
Options
A. light buff to reddish buff
B. yellow
C. black
D. none of these
Show Answer
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Discuss
Correct Answer: light buff to reddish buff
9. Which is the stable form of silica upto 1470°C?
Options
A. Quartz
B. Cristobalite
C. Tridymite
D. None of these
Show Answer
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Discuss
Correct Answer: Tridymite
10. Tar dolomite bricks are used in the
Options
A. basic Bessemer converter
B. basic open hearth furnace
C. electric furnaces
D. all (a), (b) and (c)
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c)
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