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Refractory Technology

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

Magnesia bricks
Fireclay bricks
Bauxite bricks
Silica bricks

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Refractory Technology
Spray test determines the __________ of refractories.

RUL
Resistance to CO attack
Resistance to slag penetration
Permanent linear change

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

Cristobalite
None of these
Tridymite
Quartz

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Refractory Technology
Hollow refractory bricks are made by

Slip casting
Hand moulding
Extrusion
Pressing/machine moulding

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Refractory Technology
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

15
30
10
20

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Refractory Technology
Refractoriness under load (RUL) is the most important property for the refractory bricks

Used for furnace insulation
At the hearth bottom of the furnace on which stock is placed
None of these
Used in the roof of the furnace

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