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Refractory Technology

Refractory Technology
__________ is the measure of the strength of refractory under the combined effect of temperature & load.

Porosity
RUL
Specific gravity
Thermal conductivity

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Refractory Technology
Which is the stable form of silica below 870°C ?

Tridymite
Cristobalite
None of these
Quartz

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Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Lowers
Either A or B; depends on its quantity
Increases
Does not affect

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Refractory Technology
Which is not an acidic refractory?

Carbon black
Silica
Fireclay
High alumina refractory

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Refractory Technology
Which brick undergoes maximum shrinkage on drying?

Magnesite bricks
Chromite bricks
Tar bonded dolomite bricks
Fireclay bricks

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Refractory Technology
The maximum linear expansion of silica bricks during firing is about __________ percent.

2
0.5
3.5
1

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