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Refractory Technology

Refractory Technology
Which of the following is not a neutral refractory?

Silicon carbide
Graphite
Magnesite
Chromite

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Refractory Technology
Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.

Chrome or magnesite
Silicon carbide
Lowduty fireclay
Silica

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Refractory Technology
With increasing alumina content, the fusion point of high alumina refractories

Remains constant
May increase or decrease ; depends on its alumina content
Decreases
Increases

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Refractory Technology
Panel test determines the __________ of refractories.

Slag penetration resistance
Fusion point
Spalling resistance
Refractoriness under load (RUL)

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Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Either A or B; depends on its quantity
Does not affect
Increases
Lowers

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Refractory Technology
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

80
55
70
90

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