Q. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

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Q. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

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Q. Alumina-graphite bricks are used for lining the

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Q. Spalling resistance of a refractory can not be increased by

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Q. Fireclay refractories have

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Q. Fireclay bricks is not used for lining the

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Q. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

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Q. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

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Q. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to

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Q. Thermal spalling mainly occurs during __________ of furnaces.

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Q. Which is an acidic refractory ?

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Q. Carborundum used for making crucibles for melting non-ferrous metals is chemically

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Q. Which of the following impurities reduces the refractoriness of magnesite bricks ?

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Q. Crushing strength of a refractory

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Q. Ramming masses are used for

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Q. Pick out the wrong statement.

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Q. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.

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Q. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in

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Q. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

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Q. Fireclay refractories

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