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Refractory Technology

Refractory Technology
Which is not an alumino-silicate refractory?

High alumina bricks
Mullite bricks
Tar dolomite bricks
Fireclay bricks

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Refractory Technology
Which of the following impurities reduces the refractoriness of magnesite bricks?

All of these
CaO
SiO₂
Al2O₃

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Refractory Technology
The maximum linear expansion of silica bricks during firing is about __________ percent.

1
0.5
2
3.5

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Refractory Technology
Chrome magnesite bricks are

Acidic in nature
Having higher RUL than silica bricks
Made by mixing 30% chromite and 70% periclase
Neutral in nature

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Refractory Technology
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

Crucibles used for melting of high purity metals
Insulating bricks
Muffles for muffle furnaces
Segar cones

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

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