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Refractory Technology

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

All of these
Al2O₃
SiO₂
CaO

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Refractory Technology
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its

Non-wetting characteristic
High thermal conductivity
High crushing strength
None of these

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Refractory Technology
Spalling resistance of a refractory can not be increased by

Using a coarser grog during its manufacture
Decreasing its thermal co-efficient of expansion
Increasing its porosity
Making it denser

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Refractory Technology
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

Very low alumina
Silica
Dolomite
Fireclay

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Refractory Technology
Chromite refractories are

Acidic refractory
Basic refractory
Neutral refractory
Fired at a temperature of 600°C only

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Refractory Technology
With decrease in porosity, the __________ of the refractories decreases.

Strength
None of these
Thermal conductivity
Spalling resistance

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