Q. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its

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Q. Firing temperature of magnesite bricks is about __________ °C.

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Q. Hollow refractory bricks are made by

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Q. Quartz is

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Q. An indication of degree of firing in silica brick is its

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Q. Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.

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Q. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

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Q. An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?

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Q. Firing of refractory brick is done to

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Q. Chemically, mullite refractories is

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Q. Panel test determines the __________ of refractories.

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Q. Fireclay bricks are not used in the

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Q. Fusion point of a basic refractory material is

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Q. RUL of refractories depends on the

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Q. Which is the stable form of silica between 1470°C and the melting point 1713°C ?

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Q. Refractories are dried in the

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Q. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the

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Q. Hot metal runner in blast furnace are lined with __________ bricks.

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Q. Spray test determines the __________ of refractories.

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Q. Thermal diffusivity of a refractory brick is high, when its __________ is high.

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