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Refractory Technology

Refractory Technology
Porosity of fireclay refractories is __________ percent.

44129
35-50
25-35
43961

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Refractory Technology
Which is not a natural insulating material?

None of these
Asbestos
Diatomaceous earth/kieselgur
Vermiculite

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Refractory Technology
Thermal diffusivity of a refractory brick is high, when its __________ is high.

Specific heat
Thermal conductivity
Density
None of these

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Refractory Technology
Which is not an acidic refractory?

Carbon black
Fireclay
Silica
High alumina refractory

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

All of these
Tridymite
Quartz
Cristobalite

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Refractory Technology
Zircon refractories have

High RUL (1600°C) and refractoriness (> 2000°C)
Low co-efficient of expansion
High spalling resistance
All of these

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