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

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Q. Maximum alumina content in high alumina refractory can be as high as __________ percent.

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Q. Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.

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Q. Fireclay bricks are used in the

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Q. Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.

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Q. Chromite refractories

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Q. Firing temperature is minimum (1250-1400 °C) for __________ bricks.

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Q. Resistance to slag attack of a refractory

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Q. Grog

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Q. Test piece for determination of RUL of a refractory is heated in a/an

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Q. Magnesite refractories are used for the construction of those furnaces, which are

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Q. Roof of a basic electric furnace is made of __________ bricks.

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Q. High density refractory bricks have lower

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Q. Silliminite (Al₂O₃.SiO₂) refractory, which is a neutral refractory, is not used in

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Q. Zircon refractories have

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Q. Cermets are

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Q. Carbon refractory blocks

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Q. Which is the most stable crystalline form of silica at room temperature ?

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Q. Silica refractories

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Q. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

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