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Refractory Technology

Refractory Technology
Refractories are dried in the

Tunnel kilns
None of these
Sun
Rotary kilns

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Refractory Technology
Spalling of a refractory means its

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

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Refractory Technology
Which is not a natural insulating material?

Vermiculite
Diatomaceous earth/kieselgur
Asbestos
None of these

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Refractory Technology
Porosity of silica bricks varies from __________ percent.

45 to 60
20 to 30
60 to 75
5 to 10

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Refractory Technology
Fireclay bricks are never used in the

Coke oven walls
Zinc roaster
Lead blast furnace
Beehive oven

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

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

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