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Refractory Technology

Refractory Technology
Which is not a high alumina refractory?

Corrundum
Mullite
Bauxite
Dolomite

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Refractory Technology
Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.

7-12
5-7
14-20
2-3

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Refractory Technology
Maximum apparent porosity of magnesite bricks is about __________ percent.

24
58
44
8

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Refractory Technology
Refractories are dried in the

None of these
Tunnel kilns
Sun
Rotary kilns

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Refractory Technology
Resistance to slag attack of a refractory

All of these
Decreases at higher temperature
Decreases, if defective joints & cracks exist in the refractory
Depends on the nature of slag & refractory

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Refractory Technology
Thermal spalling mainly occurs during __________ of furnaces.

Warming up
Neither A nor B
Cooling down
Both A & B

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