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Refractory Technology

Refractory Technology
Conversion of silica mineral to cristobalite is accompanied by reduction in its

Neither A nor B
Both A & B
Specific gravity
Volume

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Refractory Technology
Refractory bricks with lower permeability is produced by using

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

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Refractory Technology
High porosity refractory bricks have

Better thermal spalling resistance
All of these
Poor heat conductivity & low strength
Poor resistance to the peneration of molten slag, metal & flue gases

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Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Alumina
Thoria
Zirconia
Magnesia

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Refractory Technology
Magnesite refractories are used for the construction of those furnaces, which are

Used for raising & maintaining high temperature
Both (b) and ©
Not subjected to fluctuation in temperature
Not required to resist the corrosive action of basic slag

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Refractory Technology
Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

Silica
Zirconia
Magnesite
Fireclay

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