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Refractory Technology

Refractory Technology
Which is not a high alumina refractory?

Corrundum
Bauxite
Mullite
Dolomite

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Refractory Technology
__________ nozzles are used in continuous casting of steel,

Carborundum
Thoria
Zircon
Beryllia

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Refractory Technology
Which is the stable form of silica below 870°C ?

None of these
Quartz
Cristobalite
Tridymite

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Refractory Technology
To resist spalling tendency, a refractory should have

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

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Refractory Technology
With increase in the alumina content, the refractoriness of high alumina refractories

Remains same
Increases
Decreases
May increase or decrease

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Refractory Technology
Graphite or carbon refractories

Exihibit wetting characteristics
Are not resistant to corrosion by slag
Should be used in neutral or reducing atmosphere
Exhibit high shrinkage on thermal treatment

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