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Refractory Technology

Refractory Technology
Which form of silica has the highest specific gravity?

Tridymite
Cristobalite
All of these
Quartz

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Refractory Technology
Which of the following bricks has the most close values of RUL and PCE?

High alumina bricks
Fireclay bricks
Tar dolomite bricks
Silica bricks

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Refractory Technology
10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

Refractoriness
Crushing strength
Resistance to slag
Spalling resistance

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Refractory Technology
Magnesite chrome bricks are used in the

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

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Refractory Technology
Which of the following is not an acidic refractory?

Fireclay bricks
Magnesia bricks
Bauxite bricks
Silica bricks

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Refractory Technology
__________ is the measure of the strength of refractory under the combined effect of temperature & load.

RUL
Specific gravity
Porosity
Thermal conductivity

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