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Refractory Technology

Refractory Technology
SiO₂ percentage in firebrick is about

35-40
80-85
55-60
>94

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Refractory Technology
Chromite refractories are used in

Both A & B
Bottom of soaking pits
Neither A nor B
Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other

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Refractory Technology
Porosity of fireclay refractories is __________ percent.

35-50
44129
25-35
43961

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Refractory Technology
Which is the most stable crystalline form of silica at room temperature?

None of these
Tridymite
Quartz
Cristobalite

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Refractory Technology
Which is not an acidic refractory?

Fireclay
High alumina refractory
Carbon black
Silica

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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.

270
770
570
70

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