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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Q. Porosity of silica bricks varies from __________ percent.

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Q. Colour of fireclay bricks is

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Q. Rate of slag attack on refractories increases with rise in temperature due to the

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Q. Which of the following is not a high alumina refractory material ?

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Q. Magnesite chrome bricks are used in the

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Q. Mullite is chemically represented by

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Q. __________ bricks are used in the burning zone of a cement rotary kiln.

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Q. Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be

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