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Refractory Technology

Refractory Technology
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

70
55
80
90

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Refractory Technology
Crushing strength of a refractory

Decreases with increase in porosity
Decreases with rise in service temperature
Is unaffected with change in service temperature
Increases with rise in service temperature

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Refractory Technology
Zircon refractories have

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

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Refractory Technology
Insulating refractories should have

Both A & B
High porosity
Low thermal conductivity
Neither A nor B

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Refractory Technology
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

Carborundum
Graphite
Chromite
Fireclay

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Refractory Technology
Cold crushing strength of a refractory does not depend upon its

Composition
Shape
Firing temperature
Texture

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