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Chemical Engineering
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Refractory Technology
Comments
Question
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
Correct Answer
65
Refractory Technology problems
Search Results
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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Correct Answer: none of these.
2. Nuclides having the same atomic numbers are termed as
Options
A. isotopes
B. isomers
C. isotones
D. isobars
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Correct Answer: isomers
3. Atoms with same number of neutrons, but different number of nucleons are called
Options
A. isotones
B. isobars
C. isotopes
D. isoters
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Correct Answer: isotones
4. Percentage of U-238 in natural uranium is around
Options
A. 0.71
B. 99.29
C. 0.015
D. 29.71
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Discuss
Correct Answer: 99.29
5. Which is a fertile nuclear fuel?
Options
A. U-233
B. U-235
C. Pu-239
D. Th-232
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Correct Answer: Th-232
6. Which of the following is not a neutral refractory?
Options
A. Silicon carbide
B. Magnesite
C. Chromite
D. Graphite
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Correct Answer: Magnesite
7. 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.
8. With increase in the alumina content in firebricks, its fusion point (refractoriness)
Options
A. decreases linearly
B. remains unchanged
C. increases
D. decreases
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Correct Answer: increases
9. Which is not an alumino-silicate refractory?
Options
A. Fireclay bricks.
B. Mullite bricks.
C. Tar dolomite bricks.
D. High alumina bricks.
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Correct Answer: Tar dolomite bricks.
10. 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)
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