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Refractory Technology

Refractory Technology
Which form of silica has the highest specific gravity?

Tridymite
Quartz
Cristobalite
All of these

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

Tar bonded dolomite bricks
Magnesite bricks
Fireclay bricks
Mullite bricks

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

Silica bricks
High alumina bricks
Tar dolomite bricks
Fireclay bricks

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Refractory Technology
Grog

Is a non-plastic material
All of these
Iscrushed firebrick
Contains both alumina and silica

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Refractory Technology
To resist spalling tendency, a refractory should have

Low thermal co-efficient of expansion
Greater diffusivity
All of these
Low specific heat

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Refractory Technology
With decrease in porosity, the __________ of the refractories decreases.

Thermal conductivity
None of these
Spalling resistance
Strength

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