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Refractory Technology

Refractory Technology
The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

Corundum
Silica
Fireclay
Magnesite

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Refractory Technology
Mullite is chemically represented by

Al2O₃ . SiO₂
3Al2O₃ . 2SiO₂
Al2O₃ . 2SiO₂
2Al2O₃ . 3SiO₂

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Refractory Technology
Thermal diffusivity of a refractory brick is high, when its __________ is high.

Density
Thermal conductivity
Specific heat
None of these

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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
270
570

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Refractory Technology
Test piece for determination of RUL of a refractory is heated in a/an

Electric furnace
Reducing atmosphere
Oxidising atmosphere
Neutral atmosphere

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Refractory Technology
Cold crushing strength of fireclay bricks is about __________ kgf/cm².

200-400
500-1000
100-150
50-100

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