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Refractory Technology

Refractory Technology
Refractoriness/fusion points of 'superduty' refractories is __________ °C.

1630-1670
> 1730
1520-1630
> 2000

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Refractory Technology
Which of the following is not a high alumina refractory material?

Sillimanite
Periclase
Diaspore
Kyanite

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Refractory Technology
Maximum alumina content in high alumina refractory can be as high as __________ percent.

50
70
90
30

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Refractory Technology
Semi-silica bricks compared to silica bricks have

Better spalling resistance
Neither A nor B
Less fusion point
Both A & B

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

Tridymite
Quartz
None of these
Cristobalite

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Refractory Technology
Fusion point of an acidic refractory material is

Not affected by the addition of basic oxides
Not affected by the addition of basic oxides
Reduced by the addition of basic oxides
Increased by the addition of basic oxides

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