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Refractory Technology

Refractory Technology
Colour of fireclay bricks is

None of these
Black
Light buff to reddish buff
Yellow

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Refractory Technology
Fusion temperature of pure silica (SiO₂) is __________ °C.

2800
2570
1715
1350

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Refractory Technology
Si percentage in silica refractories used in the walls of coke oven is about

60
80
45
95

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Refractory Technology
Panel test determines the __________ of refractories.

Spalling resistance
Fusion point
Refractoriness under load (RUL)
Slag penetration resistance

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Refractory Technology
Carborundum used for making crucibles for melting non-ferrous metals is chemically

Zirconium sulphate
Silicon carbide
Crystalline magnesia
Silicon nitride

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Refractory Technology
Zirconia refractories are not used in

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

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