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REFRACTORY TECHNOLOGY

Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Increases
Either A or B; depends on its quantity
Does not affect
Lowers

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Refractory Technology
Fusion point of a basic refractory material is

Not affected by the addition of acid oxides
Increased by the addition of acid oxides
Reduced by the addition of acid oxides
Always less than 1000°C

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Refractory Technology
Which is not a natural insulating material?

Vermiculite
Asbestos
Diatomaceous earth/kieselgur
None of these

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Refractory Technology
Zirconia refractories are not used in

Lining high temperature ceramic kilns
High frequency induction furnaces in the form of inductors
Furnaces subjected to fluctuating temperature
Making sheaths for thermocouple

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Refractory Technology
Silica refractories are not used in

Coke oven walls
Open hearth furnace roof
Dome and upper portion of B.F. stoves
Beehive coke ovens

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