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Chemical Engineering
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Refractory Technology
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Question
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)
Correct Answer
crack when subjected to sudden change of temperature.
Refractory Technology problems
Search Results
1. 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
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
Show Answer
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Discuss
Correct Answer: 65
3. 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.
4. Nuclides having the same atomic numbers are termed as
Options
A. isotopes
B. isomers
C. isotones
D. isobars
Show Answer
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Discuss
Correct Answer: isomers
5. Atoms with same number of neutrons, but different number of nucleons are called
Options
A. isotones
B. isobars
C. isotopes
D. isoters
Show Answer
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Discuss
Correct Answer: isotones
6. 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
7. 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.
8. 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)
9. __________ nozzles are used in continuous casting of steel,
Options
A. Zircon
B. Thoria
C. Carborundum
D. Beryllia
Show Answer
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Discuss
Correct Answer: Zircon
10. 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
Scratch Pad
Discuss
Correct Answer: graphite
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