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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.

Silica
Corundum
Fireclay
Magnesite

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Refractory Technology
Refractory bricks with lower permeability is produced by using

Higher firing temperature
Higher moulding pressure
All of these
Finer grog size

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Refractory Technology
Colour of fireclay bricks is

None of these
Light buff to reddish buff
Black
Yellow

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Refractory Technology
Magnesite bricks have poor resistance to attack by __________ slag.

Acid
Lime
Basic
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
Refractory materials are never used in the construction of

Ovens & retorts
Orton cones
Segar cones
Pressure vessels

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