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Refractory Technology

Refractory Technology
Which of the following impurities reduces the refractoriness of magnesite bricks?

SiO₂
Al2O₃
All of these
CaO

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Refractory Technology
Refractories are dried in the

None of these
Tunnel kilns
Sun
Rotary kilns

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Refractory Technology
__________ nozzles are used in continuous casting of steel,

Zircon
Thoria
Carborundum
Beryllia

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Refractory Technology
Which is the stable form of silica below 870°C ?

None of these
Tridymite
Cristobalite
Quartz

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Refractory Technology
Silica refractories are not used in

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

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Refractory Technology
The main raw material for manufacture of silicon carbide refractories is

Carborundum
Corrundum
Periclase
Bauxite

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