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Refractory Technology

Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Zirconia
Thoria
Alumina
Magnesia

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Refractory Technology
Test piece for determination of RUL of a refractory is heated in a/an

Reducing atmosphere
Oxidising atmosphere
Neutral atmosphere
Electric furnace

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Refractory Technology
Which of the following is not an acidic refractory?

Bauxite bricks
Magnesia bricks
Silica bricks
Fireclay bricks

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Refractory Technology
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

Electrical conductivity
Cost
Fusion point
Thermal conductivity

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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
Which is not an acidic refractory?

Silica
Carbon black
Fireclay
High alumina refractory

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