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Chemical Engineering
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Refractory Technology
Comments
Question
Chromite refractories are
Options
A. acidic refractory.
B. neutral refractory.
C. basic refractory.
D. fired at a temperature of 600°C only.
Correct Answer
neutral refractory.
Refractory Technology problems
Search Results
1. 'Super refractories' are made from pure
Options
A. carbides
B. oxides
C. borides
D. nitrides
Show Answer
Scratch Pad
Discuss
Correct Answer: oxides
2. 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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Discuss
Correct Answer: low co-efficient of thermal expansion.
3. 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
4. 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
5. 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
6. Spalling resistance of a refractory can not be increased by
Options
A. increasing its porosity.
B. using a coarser grog during its manufacture.
C. decreasing its thermal co-efficient of expansion.
D. making it denser.
Show Answer
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Discuss
Correct Answer: making it denser.
7. Alumina-graphite bricks are used for lining the
Options
A. slide gate in teeming laddies.
B. continuous casting systems.
C. both (a) and (b).
D. neither (a) nor (b).
Show Answer
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Correct Answer: both (a) and (b).
8. Zirconia refractory
Options
A. does not react with basic slags.
B. is produced from baddeleyite.
C. can not be used as an insulator.
D. has poor electrical conductivity at high temperature.
Show Answer
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Discuss
Correct Answer: is produced from baddeleyite.
9. With increasing alumina content, the fusion point of high alumina refractories
Options
A. increases.
B. decreases.
C. remains constant.
D. may increase or decrease ; depends on its alumina content.
Show Answer
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Correct Answer: increases.
10. Which of the following does not occur during firing/burning of refractories?
Options
A. Removal of water of hydration.
B. Vitrification.
C. Decrease in crushing strength.
D. Development of stable mineral form.
Show Answer
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Discuss
Correct Answer: Decrease in crushing strength.
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