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Refractory Technology

Refractory Technology
Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

Zirconia
Fireclay
Magnesite
Silica

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Refractory Technology
Which brick undergoes maximum shrinkage on drying?

Chromite bricks
Tar bonded dolomite bricks
Fireclay bricks
Magnesite bricks

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Refractory Technology
Graphite or carbon refractories

Are not resistant to corrosion by slag
Exihibit wetting characteristics
Should be used in neutral or reducing atmosphere
Exhibit high shrinkage on thermal treatment

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Refractory Technology
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

Semi-silica
Fireclay
Bakelite impregnated or fused periclase
Silica

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Refractory Technology
Refractory bricks with lower permeability is produced by using

Finer grog size
Higher firing temperature
Higher moulding pressure
All of these

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Refractory Technology
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

Crucibles used for melting of high purity metals
Muffles for muffle furnaces
Segar cones
Insulating bricks

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