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Refractory Technology

Refractory Technology
Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

Fireclay
Silica
Zirconia
Magnesite

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Refractory Technology
Silica refractories are not used in

Coke oven walls
Beehive coke ovens
Open hearth furnace roof
Dome and upper portion of B.F. stoves

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Refractory Technology
Test piece for determination of RUL of a refractory is heated in a/an

Reducing atmosphere
Oxidising atmosphere
Neutral atmosphere
Electric furnace

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Refractory Technology
Which is the stable form of silica between 1470°C and the melting point 1713°C ?

None of these
Cristobalite
Tridymite
Quartz

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Refractory Technology
Silliminite (Al2O₃.SiO₂) refractory, which is a neutral refractory, is not used in

Glass melting furnace
Gas retorts
Pottery furnace
Crucibles

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Refractory Technology
Which is the most stable crystalline form of silica at room temperature?

Cristobalite
Tridymite
None of these
Quartz

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