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Chemical Engineering
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Refractory Technology
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Question
Segar cones are used for the determination of __________ of refractories.
Options
A. softening temperature
B. spalling resistance
C. electrical conductivity
D. resistance to slag attack
Correct Answer
softening temperature
Refractory Technology problems
Search Results
1. Which of the following has the lowest electrical resistivity?
Options
A. Graphite
B. Fireclay
C. Alumina
D. Zircon
Show Answer
Scratch Pad
Discuss
Correct Answer: Graphite
2. Silica refractories are not used in
Options
A. coke oven walls.
B. beehive coke ovens.
C. dome and upper portion of B.F. stoves.
D. open hearth furnace roof.
Show Answer
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Discuss
Correct Answer: beehive coke ovens.
3. Carbon bricks are not used in the lining of the
Options
A. combustion chamber of blast furnace stoves.
B. electric furnaces.
C. highly chemical resistant equipments.
D. blast furnace hearth.
Show Answer
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Discuss
Correct Answer: combustion chamber of blast furnace stoves.
4. Pick out the wrong statement.
Options
A. Sand & coke is the main raw material for the manufacture of silicon carbide.
B. Carbon refractories can not be used in the furnaces operating under reducing conditions.
C. Mullite can be obtained by the heating of alusite, kyanite or silimanite.
D. Silica occurs in nature in all cellular, amorphous or crystalline form.
Show Answer
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Discuss
Correct Answer: Carbon refractories can not be used in the furnaces operating under reducing conditions.
5. Silica bricks have low spalling resistance below 600°C, due to its
Options
A. very high thermal conductivity.
B. high co-efficient of expansion upto this temperature.
C. high thermal diffusivity.
D. low refractoriness.
Show Answer
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Discuss
Correct Answer: high co-efficient of expansion upto this temperature.
6. Lower part of hot metal mixer are lined with __________ bricks.
Options
A. superduty fireclay
B. high alumina
C. silica
D. carborundum
Show Answer
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Discuss
Correct Answer: carborundum
7. Pick out the wrong statement.
Options
A. Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
B. Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators.
C. Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity.
D. Electrical conductivity of porous refractory material is low.
Show Answer
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Discuss
Correct Answer: Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
8. Pick out the wrong statement.
Options
A. Fluxing material like lime is added in clay to reduce the vitrification temperature.
B. Main constituents of clay are alumina and silica.
C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning.
D. Vitrification of fireclay material is done to increase its porosity.
Show Answer
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Correct Answer: Vitrification of fireclay material is done to increase its porosity.
9. Refractory materials are never used in the construction of
Options
A. segar cones
B. orton cones
C. pressure vessels
D. ovens & retorts
Show Answer
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Discuss
Correct Answer: pressure vessels
10. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
Options
A. mortars
B. cements
C. castables
D. none of these
Show Answer
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Discuss
Correct Answer: castables
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