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Chemical Engineering
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Refractory Technology
Comments
Question
'Spinel', a refractory mineral is chemically represented as
Options
A. M
g
Al
2
O
4
B. M
g
Al
2
O
3
C. M
g
SO
4
D. M
g
Al
2
O
3
.2H
2
O
Correct Answer
M
g
Al
2
O
4
Refractory Technology problems
Search Results
1. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
Options
A. spalling resistance.
B. fusion point.
C. resistance to slag penetration.
D. resistance to carbon monoxide attack.
Show Answer
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Discuss
Correct Answer: fusion point.
2. Permeability of bricks is a measure of the
Options
A. refractoriness.
B. melting point.
C. rate at which a fluid will pass through the pores.
D. expansion during heating.
Show Answer
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Discuss
Correct Answer: rate at which a fluid will pass through the pores.
3. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
Options
A. 55
B. 70
C. 80
D. 90
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Correct Answer: 90
4. Which form of silica has the highest specific gravity?
Options
A. Quartz
B. Cristobalite
C. Tridymite
D. All have the same specific gravity
Show Answer
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Discuss
Correct Answer: Quartz
5. Which is an acidic refractory?
Options
A. Magnesite
B. Dolomite
C. Fireclay
D. Chrome magnesite
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Discuss
Correct Answer: Fireclay
6. Refractory castables are used for
Options
A. producing monolithic linings.
B. patch work.
C. minimising the number of joints in the structure.
D. all (a), (b) and (c).
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Correct Answer: all (a), (b) and (c).
7. Which brick undergoes maximum shrinkage on drying?
Options
A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Magnesite bricks
D. Chromite bricks
Show Answer
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Discuss
Correct Answer: Fireclay bricks
8. Carbon refractories
Options
A. do not burn/oxidise, when exposed to air on heating.
B. are not attacked by slags, as they are not wetted by melts.
C. do not resist temperature fluctuations.
D. have extremely low thermal & electrical conductivities.
Show Answer
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Correct Answer: are not attacked by slags, as they are not wetted by melts.
9. Bauxite calcining rotary kilns are lined with __________ bricks.
Options
A. fireclay
B. carbon
C. 85% alumina
D. corundum
Show Answer
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Discuss
Correct Answer: 85% alumina
10. __________ bricks are used in the burning zone of a cement rotary kiln.
Options
A. High alumina
B. Fireclay
C. Thoria
D. Silicon carbide
Show Answer
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Discuss
Correct Answer: High alumina
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