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Refractory Technology

Refractory Technology
Refractoriness/fusion points of 'superduty' refractories is __________ °C.

1520-1630
> 1730
> 2000
1630-1670

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Refractory Technology
Roof of a basic electric furnace is made of __________ bricks.

Silica
Chromite
Superduty fireclay
None of these

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

Gas retorts
Glass melting furnace
Crucibles
Pottery furnace

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Refractory Technology
Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to

CO attack
Slag attack
Thermal spalling
Fusion under load

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Refractory Technology
Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.

1630
1730
1670
1520

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Refractory Technology
Magnesite refractories have low resistance to

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

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