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Refractory Technology

Refractory Technology
Porosity of fireclay refractories is __________ percent.

35-50
25-35
44129
43961

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Refractory Technology
Refractoriness under load (RUL) is the most important property for the refractory bricks

Used for furnace insulation
None of these
At the hearth bottom of the furnace on which stock is placed
Used in the roof of the furnace

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Refractory Technology
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?

Fireclay bricks
Magnesite bricks
Mullite bricks
Tar bonded dolomite bricks

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Refractory Technology
Firing of refractory brick is done to

Form ceramic bonds necessary for development of high crushing strength in the finished product
Develop stable mineral forms in them
Dehydrate the dried refractory
All of these

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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
Pyrometric cone equivalent (PCE) of a refractory is the measure of its

Resistance to carbon monoxide attack
Resistance to slag penetration
Spalling resistance
Fusion point

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