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Chemical Engineering
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Refractory Technology
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Question
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.
Correct Answer
coke oven regenerator.
Refractory Technology problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: decreased viscosity of slag.
2. 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).
3. Use of higher percentage of lime for bonding silica bricks, reduces their
Options
A. strength
B. abrasion resistance
C. both (a) & (b)
D. neither (a) nor (b)
Show Answer
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Discuss
Correct Answer: both (a) & (b)
4. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
Options
A. washing action of metal.
B. corrosion by layer of slag.
C. both (a) & (b).
D. neither (a) nor (b).
Show Answer
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Discuss
Correct Answer: washing action of metal.
5. The maximum linear expansion of silica bricks during firing is about __________ percent.
Options
A. 0.5
B. 1
C. 2
D. 3.5
Show Answer
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Discuss
Correct Answer: 3.5
6. 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).
7. 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
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Discuss
Correct Answer: all (a), (b) and (c).
8. Roof of a basic open hearth furnace is lined with __________ bricks.
Options
A. silica
B. fireclay
C. dolomite
D. magnesite
Show Answer
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Discuss
Correct Answer: silica
9. 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.
10. 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
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