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Refractory Technology

Refractory Technology
Insulating refractories should have

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

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Refractory Technology
Dilatometer is used for the determination of __________ of refractories.

Resistance to CO attack
Modulus of rupture
RUL
Permanent linear change

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Refractory Technology
The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

Corundum
Silica
Fireclay
Magnesite

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Refractory Technology
Which is the stable form of silica upto 1470°C ?

Cristobalite
Tridymite
Quartz
None of these

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Refractory Technology
With increase in the alumina content in firebricks, its fusion point (refractoriness)

Remains unchanged
Decreases linearly
Decreases
Increases

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Refractory Technology
Cold crushing strength of fireclay bricks is about __________ kgf/cm².

50-100
500-1000
200-400
100-150

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