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Chemical Engineering
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Refractory Technology
Comments
Question
With increase in the density of silica refractories, its
Options
A. resistance to slag attack increases.
B. spalling resistance reduces.
C. both (a) and (b).
D. neither (a) nor (b).
Correct Answer
both (a) and (b).
Refractory Technology problems
Search Results
1. __________ bricks should not be used in oxidising atmosphere.
Options
A. Tar dolomite
B. Carbon
C. Silica
D. Fireclay
Show Answer
Scratch Pad
Discuss
Correct Answer: Carbon
2. Thermal spalling mainly occurs during __________ of furnaces.
Options
A. cooling down
B. warming up
C. both (a) & (b)
D. neither (a) nor (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: both (a) & (b)
3. Which is a neutral refractory?
Options
A. Graphite
B. Magnesite chrome
C. Silica
D. Magnesia
Show Answer
Scratch Pad
Discuss
Correct Answer: Graphite
4. Faster rate of drying of moulded refractories results in high __________ of refractories.
Options
A. green strength
B. voids
C. shrinkage
D. both (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: both (b) and (c)
5. Pick out the wrong statement.
Options
A. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass.
B. Ceramic materials do not undergo vitrification on heating.
C. Ceramic materials are brittle in nature.
D. Non-oxide ceramic materials generally act as a semi-conductor.
Show Answer
Scratch Pad
Discuss
Correct Answer: Ceramic materials do not undergo vitrification on heating.
6. Fireclay bricks is not used for lining the
Options
A. cupola.
B. gas producer.
C. bottom of hot metal mixer.
D. roof of open hearth furnace.
Show Answer
Scratch Pad
Discuss
Correct Answer: bottom of hot metal mixer.
7. Fusion temperature of pure silica (SiO
2
) is __________ °C.
Options
A. 1350
B. 1715
C. 2570
D. 2800
Show Answer
Scratch Pad
Discuss
Correct Answer: 1715
8. __________ is not a single oxiderefractory.
Options
A. Zirconia
B. Silicon carbide
C. Magnesia
D. None of these
Show Answer
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Discuss
Correct Answer: Silicon carbide
9. The highest melting pure oxide (m.p. > 3000°C)is
Options
A. thoria
B. alumina
C. beryllia
D. zirconia
Show Answer
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Discuss
Correct Answer: thoria
10. Natural silica
Options
A. mainly contains quartz.
B. is not stable at high temperature.
C. transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
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