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REFRACTORY TECHNOLOGY

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

Silicon nitride
Zirconium sulphate
Silicon carbide
Crystalline magnesia

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Refractory Technology
Which one contains minimum percentage of SiO₂?

Firebrick
Aluminous firebrick
Sillimanite
Semi-silica

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Refractory Technology
Dilatometer is used for the determination of __________ of refractories.

Modulus of rupture
RUL
Resistance to CO attack
Permanent linear change

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Refractory Technology
Segar cones are used for the determination of __________ of refractories.

Softening temperature
Spalling resistance
Electrical conductivity
Resistance to slag attack

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Refractory Technology
RUL of refractories depends on the

All of these
Physical structure
Presence of impurities like iron & alkali
Chemical composition

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