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Chemical Engineering
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Refractory Technology
Comments
Question
Silicon carbide refractories are used in the
Options
A. muffle furnace
B. zinc smelting furnace
C. ceramic recuperators
D. all (a), (b) and (c)
Correct Answer
all (a), (b) and (c)
Refractory Technology problems
Search Results
1. Which is a basic refractory?
Options
A. Fireclay
B. Silica
C. Chrome magnesite
D. None of these
Show Answer
Scratch Pad
Discuss
Correct Answer: Chrome magnesite
2. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?
Options
A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Mullite bricks
D. Magnesite bricks
Show Answer
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Discuss
Correct Answer: Tar bonded dolomite bricks
3. Cold crushing strength of refractories depends upon its
Options
A. composition
B. texture
C. firing temperature
D. all (a), (b) and (c)
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c)
4. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm
2
.
Options
A. 10
B. 100
C. 500
D. 1000
Show Answer
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Discuss
Correct Answer: 1000
5. Fusion point of an acidic refractory material is
Options
A. increased by the addition of basic oxides.
B. reduced by the addition of basic oxides.
C. not affected by the addition of basic oxides.
D. always more than 2500°C.
Show Answer
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Discuss
Correct Answer: reduced by the addition of basic oxides.
6. Which is not a high alumina refractory?
Options
A. Mullite
B. Corrundum
C. Bauxite
D. Dolomite
Show Answer
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Discuss
Correct Answer: Dolomite
7. Ramming masses are used for
Options
A. obtaining monolithic working faces.
B. repairing construction of various furnace parts.
C. both (a) & (b).
D. neither (a) nor (b).
Show Answer
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Discuss
Correct Answer: both (a) & (b).
8. __________ is the measure of the strength of refractory under the combined effect of temperature & load.
Options
A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity
Show Answer
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Discuss
Correct Answer: RUL
9. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
Options
A. spalling resistance
B. refractoriness
C. crushing strength
D. resistance to slag
Show Answer
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Discuss
Correct Answer: spalling resistance
10. High alumina refractory compared to fireclay bricks have
Options
A. less load bearing capacity.
B. less resistance to slag attack.
C. low refractoriness.
D. high resistance to thermal shock and creep.
Show Answer
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Discuss
Correct Answer: high resistance to thermal shock and creep.
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