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Refractory Technology

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

None of these
Fusion point
Specific gravity
RUL

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Refractory Technology
Dilatometer is used for the determination of __________ of refractories.

RUL
Resistance to CO attack
Permanent linear change
Modulus of rupture

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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.

55
70
90
80

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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

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

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Refractory Technology
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

Chromite
Fireclay
Graphite
Carborundum

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Refractory Technology
Refractory bricks with lower permeability is produced by using

Finer grog size
All of these
Higher moulding pressure
Higher firing temperature

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