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Chemical Engineering
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Refractory Technology
Comments
Question
__________ nozzles are used in continuous casting of steel,
Options
A. Zircon
B. Thoria
C. Carborundum
D. Beryllia
Correct Answer
Zircon
Refractory Technology problems
Search Results
1. Which is required in an insulating refractory?
Options
A. High thermal conductivity
B. Low porosity
C. Both (a) and (b)
D. Neither (a) nor (b)
Show Answer
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Discuss
Correct Answer: Neither (a) nor (b)
2. Which is not an alumino-silicate refractory?
Options
A. Fireclay bricks.
B. Mullite bricks.
C. Tar dolomite bricks.
D. High alumina bricks.
Show Answer
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Discuss
Correct Answer: Tar dolomite bricks.
3. With increase in the alumina content in firebricks, its fusion point (refractoriness)
Options
A. decreases linearly
B. remains unchanged
C. increases
D. decreases
Show Answer
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Discuss
Correct Answer: increases
4. Silica refractories
Options
A. crack when subjected to sudden change of temperature.
B. can not be used in the dome of hot blast stoves.
C. have lower thermal conductivity than fireclay bricks.
D. all (a), (b) and (c)
Show Answer
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Correct Answer: crack when subjected to sudden change of temperature.
5. Which of the following is not a neutral refractory?
Options
A. Silicon carbide
B. Magnesite
C. Chromite
D. Graphite
Show Answer
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Discuss
Correct Answer: Magnesite
6. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
Options
A. fireclay
B. carborundum
C. graphite
D. chromite
Show Answer
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Discuss
Correct Answer: graphite
7. Which is the most stable crystalline form of silica at room temperature?
Options
A. Quartz
B. Cristobalite
C. Tridymite
D. None of these
Show Answer
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Discuss
Correct Answer: Quartz
8. Which of the following is not an acidic refractory?
Options
A. Silica bricks
B. Fireclay bricks
C. Bauxite bricks
D. Magnesia bricks
Show Answer
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Discuss
Correct Answer: Magnesia bricks
9. Fireclay refractories have
Options
A. low co-efficient of thermal expansion.
B. poor thermal spalling resistance.
C. tendency to expand unduly high during firing.
D. very high cost.
Show Answer
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Correct Answer: low co-efficient of thermal expansion.
10. 'Super refractories' are made from pure
Options
A. carbides
B. oxides
C. borides
D. nitrides
Show Answer
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Discuss
Correct Answer: oxides
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