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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Q. Which is the stable form of silica upto 1470°C ?

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Q. Hot face insulating linings of high purity alumina fused mullite are used, where

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Q. To resist spalling tendency, a refractory should have

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Q. Cold crushing strength of fireclay bricks is about __________ kgf/cm².

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Q. Spalling tendency of refractories is reduced by increasing its

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Q. Carbon refractories are exclusively used in the

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Q. Spalling of a refractory means its

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Q. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the

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Q. Pyrometric cone equivalent (PCE) of a refractory is the measure of its

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

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Q. Chrome magnesite brick is not used for lining the

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Q. Which one contains minimum percentage of SiO₂?

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