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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Q. Which is a neutral refractory ?

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Q. Permeability of bricks is a measure of the

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Q. With increase in the density of silica refractories, its

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Q. Magnesite chrome refractories

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Q. Zirconia refractories are not used in

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Q. Carbon refractories

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Q. Magnesite refractories have low resistance to

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Q. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?

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Q. The maximum linear expansion of silica bricks during firing is about __________ percent.

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Q. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

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Q. Porosity of fireclay refractories is __________ percent.

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Q. SiO₂ percentage in firebrick is about

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Q. Porosity is induced in insulating refractories by adding

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Q. Magnesite bricks have poor resistance to attack by __________ slag.

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Q. An ideal refractory should have high

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Q. Ganister is a source of the

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Q. Which brick undergoes maximum shrinkage on drying ?

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