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Refractory Technology

Refractory Technology
Which one contains minimum percentage of SiO₂?

Semi-silica
Sillimanite
Aluminous firebrick
Firebrick

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Refractory Technology
SiO₂ percentage in firebrick is about

>94
55-60
80-85
35-40

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Refractory Technology
Dolomite bricks have good resistance to attack by

Molten steel
Lime slag
Iron oxide
None of these

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Refractory Technology
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of

Corrundum
Silicon carbide
Siliceous fireclay
Fireclay

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Refractory Technology
'Super refractories' are made from pure

Carbides
Borides
Oxides
Nitrides

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Refractory Technology
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

Fireclay
Silica
Dolomite
Very low alumina

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