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Chemical Engineering
‣
Refractory Technology
Comments
Question
Which is an acidic refractory?
Options
A. Magnesite
B. Dolomite
C. Fireclay
D. Chrome magnesite
Correct Answer
Fireclay
Refractory Technology problems
Search Results
1. Which is not an acidic refractory?
Options
A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black
Show Answer
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Discuss
Correct Answer: Carbon black
2. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
Options
A. bakelite impregnated or fused periclase
B. silica
C. semi-silica
D. fireclay
Show Answer
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Discuss
Correct Answer: bakelite impregnated or fused periclase
3. Thermal conductivity of refractory bricks
Options
A. increases with decrease in porosity.
B. decreases with decreases in porosity.
C. is independent of its porosity and is maximum for insulating bricks.
D. increases with the amount of air entrapped in pores.
Show Answer
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Discuss
Correct Answer: increases with decrease in porosity.
4. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
Options
A. less shrinkage in heating, decreased apparent porosity & increased specific gravity.
B. high strength & thermal spalling resistance.
C. less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
D. all (a), (b) and (c).
Show Answer
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Correct Answer: all (a), (b) and (c).
5. Fireclay bricks are not used in the
Options
A. blast furnace
B. hot blast stove
C. cupola
D. wall of coke oven
Show Answer
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Discuss
Correct Answer: wall of coke oven
6. 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
7. 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
Show Answer
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Discuss
Correct Answer: 90
8. 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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Correct Answer: rate at which a fluid will pass through the pores.
9. 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.
10. '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
Show Answer
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Discuss
Correct Answer: M
g
Al
2
O
4
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