Q. Which form of silica has the highest specific gravity ?

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Q. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of

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Q. __________ is the measure of the strength of refractory under the combined effect of temperature & load.

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Q. Fireclay bricks are not used in the

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Q. Refractories used in/for __________ should have low thermal conductivity.

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Q. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

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Q. Silica bricks are never used for lining the

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Q. Which is not a natural insulating material?

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Q. Magnesite refractories are generally not used in the

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Q. __________ is not a single oxiderefractory.

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

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Q. High alumina refractory compared to fireclay bricks have

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Q. Refractory bricks with lower permeability is produced by using

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Q. Refractory bricks having lower porosity have

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Q. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.

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Q. Pick out the wrong statement.

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Q. __________ bricks should not be used in oxidising atmosphere.

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Q. Pick out the wrong statement.

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Q. Fusion temperature of pure silica (SiO₂) is __________ °C.

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Q. Addition of zircon to silica refractory brick improves its

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