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Refractory Technology

Refractory Technology
Thermal diffusivity of a refractory brick is high, when its __________ is high.

Specific heat
None of these
Density
Thermal conductivity

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

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

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Refractory Technology
Spalling tendency of refractories is reduced by increasing its

Thermal conductivity
Specific gravity
Strength
Porosity

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Refractory Technology
High density refractory bricks have lower

Slag penetration resistance
Thermal conductivity
Spalling resistance
Fusion point

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

Alumina
Thoria
Magnesia
Zirconia

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Refractory Technology
Hollow refractory bricks are made by

Extrusion
Hand moulding
Slip casting
Pressing/machine moulding

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