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Chemical Engineering
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Refractory Technology
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Question
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)
Correct Answer
both (b) and (c)
Refractory Technology problems
Search Results
1. 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
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Discuss
Correct Answer: Ceramic materials do not undergo vitrification on heating.
2. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
Options
A. Beryllia
B. Carborundum
C. Corundum
D. Thoria
Show Answer
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Discuss
Correct Answer: Beryllia
3. Silica bricks are never used for lining the
Options
A. beehive coke ovens.
B. by-product coke ovens.
C. dome of blast furnace stoves.
D. roof of open hearth furnace.
Show Answer
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Discuss
Correct Answer: beehive coke ovens.
4. Magnesite chrome refractories
Options
A. have better spalling resistance than chrome magnesite refractories.
B. have very low thermal co-efficient of expansion.
C. are not at all resistant to the corrosive action of iron oxide.
D. have very low (50 kg/cm
2
) cold crushing strength (C.C.S.), and can not be used in metalcase form.
Show Answer
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Discuss
Correct Answer: have better spalling resistance than chrome magnesite refractories.
5. Dolomite bricks have good resistance to attack by
Options
A. molten steel
B. iron oxide
C. lime slag
D. none of these
Show Answer
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Discuss
Correct Answer: molten steel
6. Which is a neutral refractory?
Options
A. Graphite
B. Magnesite chrome
C. Silica
D. Magnesia
Show Answer
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Discuss
Correct Answer: Graphite
7. 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
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Discuss
Correct Answer: both (a) & (b)
8. __________ bricks should not be used in oxidising atmosphere.
Options
A. Tar dolomite
B. Carbon
C. Silica
D. Fireclay
Show Answer
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Discuss
Correct Answer: Carbon
9. 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
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Discuss
Correct Answer: both (a) and (b).
10. 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.
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