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Refractory Technology

Refractory Technology
Which of the following has the lowest electrical resistivity?

Alumina
Graphite
Fireclay
Zircon

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Refractory Technology
High alumina refractory compared to fireclay bricks have

High resistance to thermal shock and creep
Less load bearing capacity
Low refractoriness
Less resistance to slag attack

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

Specific gravity
Fusion point
None of these
RUL

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Refractory Technology
Spalling tendency of refractories is reduced by increasing its

Porosity
Specific gravity
Thermal conductivity
Strength

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Refractory Technology
Magnesite refractories have low resistance to

Both B and C
Abrasion
Disintegration on sudden change of temperature
Attack by basic slag

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Refractory Technology
Porosity is induced in insulating refractories by adding

Powdered naphthalene
Calcium phosphate
Ammonium chloride/sulphate
All of these

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