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Refractory Technology

Refractory Technology
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

1630
1520
1730
1670

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Refractory Technology
Resistance to slag attack of a refractory

All of these
Decreases at higher temperature
Decreases, if defective joints & cracks exist in the refractory
Depends on the nature of slag & refractory

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Refractory Technology
Chemically, mullite refractories is

ZrSO₄
3Al2O₃.2SiO₂
ThO₂
Al2O₃

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Refractory Technology
Which of the following is not a high alumina refractory material?

Diaspore
Periclase
Kyanite
Sillimanite

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Refractory Technology
Which of the following impurities reduces the refractoriness of magnesite bricks?

Al2O₃
SiO₂
All of these
CaO

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Refractory Technology
Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

Refractoriness under load (RUL)
Refractoriness
Spalling resistance
None of these

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