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Refractory Technology

Refractory Technology
Cold crushing strength of refractories depends upon its

All of these
Composition
Firing temperature
Texture

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Refractory Technology
Which is not a basic refractory?

Magnesite
Chrome magnesite
Silicon carbide
Dolomite

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Refractory Technology
Refractory bricks having lower porosity have

Greater strength
Low heat capacity
Low thermal conductivity
High insulating properties

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Refractory Technology
Magnesite refractories are generally not used in the

Electric furnace walls
Burning zone of cement kilns
Steel melting furnace
Open hearth furnace

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Refractory Technology
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory

Mortars
Cements
None of these
Castables

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Refractory Technology
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

70
770
570
270

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