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Refractory Technology

Refractory Technology
Colour of fireclay bricks is

Yellow
Black
None of these
Light buff to reddish buff

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Refractory Technology
Which is the stable form of silica upto 1470°C ?

Tridymite
Quartz
Cristobalite
None of these

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Refractory Technology
__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

High thermal conductivity
Non-wetting characteristics
High density
Low porosity

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Refractory Technology
Magnesite refractories have low resistance to

Disintegration on sudden change of temperature
Attack by basic slag
Abrasion
Both B and C

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Refractory Technology
Which is required in an insulating refractory?

Both A & B
Neither A nor B
High thermal conductivity
Low porosity

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Refractory Technology
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

Fusion point
Thermal conductivity
Electrical conductivity
Cost

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