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Refractory Technology

Refractory Technology
Roof of a basic open hearth furnace is lined with __________ bricks.

Silica
Fireclay
Magnesite
Dolomite

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Refractory Technology
High thermal conductivity of a refractory material is not important, when it is to be used in the

Recuperators
Muffle furnace
Coke oven regenarators
Blast furnace

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Refractory Technology
Hollow refractory bricks are made by

Slip casting
Hand moulding
Pressing/machine moulding
Extrusion

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Refractory Technology
Maximum apparent porosity of magnesite bricks is about __________ percent.

24
8
58
44

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Refractory Technology
Carbon refractories have very high

Wetting characteristics
Thermal conductivity
Both B and C
Refractoriness

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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
70
90
55

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