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Refractory Technology

Refractory Technology
Which is required in an insulating refractory?

Both A & B
Low porosity
Neither A nor B
High thermal conductivity

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Refractory Technology
To resist spalling tendency, a refractory should have

Greater diffusivity
Low thermal co-efficient of expansion
All of these
Low specific heat

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Refractory Technology
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

1000
2000
700
1600

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Refractory Technology
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

Dolomite
Very low alumina
Fireclay
Silica

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Refractory Technology
With decrease in porosity, the __________ of the refractories decreases.

Spalling resistance
None of these
Strength
Thermal conductivity

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Refractory Technology
Alumina-graphite bricks are used for lining the

Slide gate in teeming laddies
Neither A nor B
Continuous casting systems
Both A & B

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