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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Q. High porosity refractory bricks have

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Q. Vacuum steel degassing units are lined with

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Q. Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.

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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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