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Chemical Engineering
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Refractory Technology
Comments
Question
__________ is not a single oxiderefractory.
Options
A. Zirconia
B. Silicon carbide
C. Magnesia
D. None of these
Correct Answer
Silicon carbide
Refractory Technology problems
Search Results
1. 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
2. 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.
3. 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).
Show Answer
Scratch Pad
Discuss
Correct Answer: both (a) and (b).
4. __________ 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
5. 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)
6. The highest melting pure oxide (m.p. > 3000°C)is
Options
A. thoria
B. alumina
C. beryllia
D. zirconia
Show Answer
Scratch Pad
Discuss
Correct Answer: thoria
7. 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).
8. Bottom of basic open hearth furnace are constructed of
Options
A. dead burnt magnesite ramming mass.
B. porous fireclay bricks.
C. semi-silica bricks.
D. silicon carbide bricks.
Show Answer
Scratch Pad
Discuss
Correct Answer: dead burnt magnesite ramming mass.
9. Refractories used in/for __________ should have low thermal conductivity.
Options
A. coke ovens
B. insulation
C. regenerators
D. muffle furnaces
Show Answer
Scratch Pad
Discuss
Correct Answer: insulation
10. Magnesite refractories are generally not used in the
Options
A. electric furnace walls.
B. steel melting furnace.
C. open hearth furnace.
D. burning zone of cement kilns.
Show Answer
Scratch Pad
Discuss
Correct Answer: steel melting furnace.
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