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Refractory Technology

Refractory Technology
Which of the following is not a high alumina refractory material?

Kyanite
Diaspore
Periclase
Sillimanite

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Refractory Technology
Silicon carbide refractories are used in the

All of these
Zinc smelting furnace
Muffle furnace
Ceramic recuperators

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Refractory Technology
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

570
270
70
770

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Refractory Technology
Mullite is chemically represented by

3Al2O₃ . 2SiO₂
Al2O₃ . 2SiO₂
2Al2O₃ . 3SiO₂
Al2O₃ . SiO₂

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Refractory Technology
Which is not an alumino-silicate refractory?

Fireclay bricks
Mullite bricks
High alumina bricks
Tar dolomite bricks

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Refractory Technology
Which one contains minimum percentage of SiO₂?

Aluminous firebrick
Semi-silica
Firebrick
Sillimanite

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