Q. Which is the stable form of silica below 870°C ?

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Q. Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

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Q. Magnesite bricks are used in those parts of furnaces, which are

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Q. Which is not a basic refractory ?

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Q. Thoria

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Q. Which property of refractories is the most important for top section of the blast furnace?

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Q. Which one expands on heating ?

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Q. Refractoriness/fusion points of 'superduty' refractories is __________ °C.

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Q. Outer combustion chamber of blast furnace stove is lined with __________ bricks.

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Q. Presence of MgO in alumino-silicate refractories __________ its refractoriness.

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Q. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

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Q. With increase in the alumina content, the refractoriness of high alumina refractories

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Q. A steel member used in the furnace construction to take the thrust of the brickwork is called

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Q. With increase in the porosity, thermal spalling resistance of fireclay brick

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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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