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Refractory Technology
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Question
Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
Options
A. chrome or magnesite
B. silicon carbide
C. silica
D. lowduty fireclay
Correct Answer
chrome or magnesite
Refractory Technology problems
Search Results
1. Which is not a natural insulating material?
Options
A. Diatomaceous earth/kieselgur
B. Asbestos
C. Vermiculite
D. None of these
Show Answer
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Discuss
Correct Answer: None of these
2. Refractory bricks with lower permeability is produced by using
Options
A. higher firing temperature.
B. higher moulding pressure.
C. finer grog size.
D. all (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
3. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
Options
A. 80 and 20
B. 20 and 80
C. 50 and 50
D. 60 and 40
Show Answer
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Correct Answer: 80 and 20
4. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
Options
A. thermal spalling
B. slag attack
C. fusion under load
D. CO attack
Show Answer
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Discuss
Correct Answer: thermal spalling
5. Carborundum used for making crucibles for melting non-ferrous metals is chemically
Options
A. silicon carbide
B. silicon nitride
C. crystalline magnesia
D. zirconium sulphate
Show Answer
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Correct Answer: silicon carbide
6. 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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Correct Answer: wall of coke oven
7. 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).
8. 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.
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Correct Answer: increases with decrease in porosity.
9. 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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Correct Answer: bakelite impregnated or fused periclase
10. 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
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