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Refractory Technology

Refractory Technology
Porosity of fireclay refractories is __________ percent.

25-35
35-50
44129
43961

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Refractory Technology
Fusion point of an acidic refractory material is

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

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Refractory Technology
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

Thermal conductivity
Electrical conductivity
Fusion point
Cost

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Refractory Technology
A steel member used in the furnace construction to take the thrust of the brickwork is called

Armouring
Buckstay
Breast wall
Baffle

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

Tar dolomite bricks
Fireclay bricks
High alumina bricks
Silica bricks

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Refractory Technology
Refractory castables are used for

Patch work
All of these
Producing monolithic linings
Minimising the number of joints in the structure

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