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Refractory Technology

Refractory Technology
With decrease in porosity, the __________ of the refractories decreases.

Strength
Spalling resistance
None of these
Thermal conductivity

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Refractory Technology
Outer combustion chamber of blast furnace stove is lined with __________ bricks.

Chrome magnesite
Fireclay
Silica
Zirconia

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Refractory Technology
Refractoriness under load (RUL) is the most important property for the refractory bricks

Used for furnace insulation
At the hearth bottom of the furnace on which stock is placed
Used in the roof of the furnace
None of these

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Refractory Technology
Magnesite bricks are used in those parts of furnaces, which are

Required to resist corrosive basic slag
Subjected to high load
Subjected to temperature fluctuation
None of these

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Refractory Technology
Which form of silica has the highest specific gravity?

Quartz
Tridymite
All of these
Cristobalite

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Refractory Technology
Spalling of a refractory means its

Softening
Resistancce to compressive loads
Fracture due to uneven expansion at high temperature
Resistance to chemical action of gases and molten fluxes

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