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Refractory Technology problems
1. silicon carbide refractories have very low
Options
A. refractoriness (< 1700°C).
B. thermal conductivity.
C. resistance to thermal shock.
D. none of these.
Show Answer
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Discuss
Correct Answer: none of these.
2. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm
2
. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm
2
.
Options
A. 450
B. 250
C. 150
D. 65
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Correct Answer: 65
3. Which of the following is not a neutral refractory?
Options
A. Silicon carbide
B. Magnesite
C. Chromite
D. Graphite
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Discuss
Correct Answer: Magnesite
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. 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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Correct Answer: increases
6. 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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Correct Answer: Tar dolomite bricks.
7. 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)
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Correct Answer: Neither (a) nor (b)
8. __________ nozzles are used in continuous casting of steel,
Options
A. Zircon
B. Thoria
C. Carborundum
D. Beryllia
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Correct Answer: Zircon
9. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
Options
A. fireclay
B. carborundum
C. graphite
D. chromite
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Correct Answer: graphite
10. 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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Correct Answer: Quartz
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