Q. Maximum apparent porosity of magnesite bricks is about __________ percent.

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Q. Dilatometer is used for the determination of __________ of refractories.

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Q. With decrease in porosity, the __________ of the refractories decreases.

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Q. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.

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Q. __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

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Q. Bauxite calcining rotary kilns are lined with __________ bricks.

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Q. Use of higher percentage of lime for bonding silica bricks, reduces their

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Q. Grog addition in fireclay during brick manufacture is done to

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Q. Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ?

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Q. Refractory castables are used for

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Q. The largest consumer of refractories is the __________ industry.

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Q. Graphite or carbon refractories

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Q. 'Spinel', a refractory mineral is chemically represented as

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Q. Carbon bricks are not used in the lining of the

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Q. Pick out the wrong statement.

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Q. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

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Q. Chrome magnesite bricks are

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Q. The main raw material for manufacture of silicon carbide refractories is

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Q. Chromite refractories are used in

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Q. Which of the following has the lowest electrical resistivity ?

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