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Refractory Technology

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

Tridymite
Quartz
None of these
Cristobalite

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Refractory Technology
Magnesite refractories have low resistance to

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

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Refractory Technology
Hot face insulating linings of high purity alumina fused mullite are used, where

Very high temperatures are involved
Presence of iron or silica is harmful
All of these
Highly reducing conditions are involved

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Refractory Technology
Thermal spalling mainly occurs during __________ of furnaces.

Cooling down
Warming up
Both A & B
Neither A nor B

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

Electric furnace
Reducing atmosphere
Oxidising atmosphere
Neutral atmosphere

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Refractory Technology
Which one expands on heating?

Silica bricks
Neither A nor B
Fireclay bricks
Both A & B

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