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Refractory Technology

Refractory Technology
Porosity of fireclay refractories is __________ percent.

35-50
25-35
43961
44129

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Refractory Technology
Panel test determines the __________ of refractories.

Fusion point
Slag penetration resistance
Spalling resistance
Refractoriness under load (RUL)

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Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Thoria
Zirconia
Magnesia
Alumina

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Refractory Technology
Silica bricks are never used for lining the

By-product coke ovens
Roof of open hearth furnace
Beehive coke ovens
Dome of blast furnace stoves

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Refractory Technology
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?

Cork
Chemically prepared foam
Sand
Saw dust

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

Thermal conductivity
Spalling resistance
Strength
None of these

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