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Chemical Engineering
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Refractory Technology
Comments
Question
Use of higher percentage of lime for bonding silica bricks, reduces their
Options
A. strength
B. abrasion resistance
C. both (a) & (b)
D. neither (a) nor (b)
Correct Answer
both (a) & (b)
Refractory Technology problems
Search Results
1. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
Options
A. washing action of metal.
B. corrosion by layer of slag.
C. both (a) & (b).
D. neither (a) nor (b).
Show Answer
Scratch Pad
Discuss
Correct Answer: washing action of metal.
2. The maximum linear expansion of silica bricks during firing is about __________ percent.
Options
A. 0.5
B. 1
C. 2
D. 3.5
Show Answer
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Discuss
Correct Answer: 3.5
3. Dilatometer is used for the determination of __________ of refractories.
Options
A. modulus of rupture
B. permanent linear change
C. resistance to CO attack
D. RUL
Show Answer
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Discuss
Correct Answer: permanent linear change
4. Graphite or carbon refractories
Options
A. exihibit wetting characteristics.
B. should be used in neutral or reducing atmosphere.
C. exhibit high shrinkage on thermal treatment.
D. are not resistant to corrosion by slag.
Show Answer
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Discuss
Correct Answer: should be used in neutral or reducing atmosphere.
5. Mullite is chemically represented by
Options
A. Al
2
O
3
. 2SiO
2
B. 3Al
2
O
3
. 2SiO
2
C. Al
2
O
3
. SiO
2
D. 2Al
2
O
3
. 3SiO
2
Show Answer
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Discuss
Correct Answer: 3Al
2
O
3
. 2SiO
2
6. Semi-silica bricks compared to silica bricks have
Options
A. less fusion point.
B. better spalling resistance.
C. both (a) and (b).
D. neither (a) not (b).
Show Answer
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Discuss
Correct Answer: both (a) and (b).
7. Rate of slag attack on refractories increases with rise in temperature due to the
Options
A. decreased viscosity of slag.
B. increased thermal conductivity of brick.
C. oxidising condition in the furnace.
D. none of these.
Show Answer
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Discuss
Correct Answer: decreased viscosity of slag.
8. Chrome magnesite brick is not used for lining the
Options
A. hearth of soaking pits.
B. bottom hearth of reheating furnace.
C. coke oven regenerator.
D. burning zone of limestone rotary kilns.
Show Answer
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Discuss
Correct Answer: coke oven regenerator.
9. To resist spalling tendency, a refractory should have
Options
A. greater diffusivity.
B. low specific heat.
C. low thermal co-efficient of expansion.
D. all (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
10. Grog addition in fireclay during brick manufacture is done to
Options
A. reduce its shrinkage on heating.
B. impart greater spalling resistance.
C. enhance the strength of fired refractories.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
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