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Refractory Technology

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.

90
70
80
55

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Refractory Technology
Which brick undergoes maximum shrinkage on drying?

Magnesite bricks
Fireclay bricks
Chromite bricks
Tar bonded dolomite bricks

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Refractory Technology
An indication of degree of firing in silica brick is its

Fusion point
None of these
Specific gravity
RUL

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

44
58
8
24

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Refractory Technology
Refractory materials are never used in the construction of

Segar cones
Orton cones
Pressure vessels
Ovens & retorts

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Refractory Technology
Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be

Oxidising
Neutral
Either A or B
Neither A nor B

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