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Refractory Technology

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

Quartz
Tridymite
Cristobalite
None of these

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Refractory Technology
Mullite is chemically represented by

Al2O₃ . 2SiO₂
3Al2O₃ . 2SiO₂
2Al2O₃ . 3SiO₂
Al2O₃ . SiO₂

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Refractory Technology
Fireclay bricks are used in the

Chimney linings
All of these
Furnaces allowed to cool frequently
Flues

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Refractory Technology
High refractorinness of refractory bricks means, that it has a

Low spalling resistance
Low porosity
High spalling resistance
High resistance to fusion

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Refractory Technology
Magnesite chrome bricks are used in the

Roof lining of basic open hearth & other basic furnaces
All of these
Soaking pits
Reheating furnaces

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Refractory Technology
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

70
55
80
90

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