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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Q. Roof of a basic open hearth furnace is lined with __________ bricks.

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Q. High alumina refractories are used in the

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Q. Semi-silica bricks compared to silica bricks have

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Q. Mixing of ground refractory material and water is done in a __________ mill.

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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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