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Refractory Technology

Refractory Technology
An indication of degree of firing in silica brick is its

RUL
None of these
Fusion point
Specific gravity

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Refractory Technology
Grog addition in fireclay during brick manufacture is done to

Reduce its shrinkage on heating
All of these
Impart greater spalling resistance
Enhance the strength of fired refractories

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Refractory Technology
Fusion point of an acidic refractory material is

Not affected by the addition of basic oxides
Not affected by the addition of basic oxides
Increased by the addition of basic oxides
Reduced by the addition of basic oxides

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Refractory Technology
Refractory bricks with lower permeability is produced by using

Higher moulding pressure
Higher firing temperature
Finer grog size
All of these

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Refractory Technology
Which property of refractories is the most important for top section of the blast furnace?

Resistance to slag peneration
Stability of volume at high temperature
Resistance to corrosion by slag
Resistance to abrasion

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

Superduty fireclay
Chromite
Silica
None of these

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