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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Q. Which is not a basic refractory ?

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Q. Thoria

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Q. Which property of refractories is the most important for top section of the blast furnace?

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Q. Which one expands on heating ?

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Q. Refractoriness/fusion points of 'superduty' refractories is __________ °C.

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Q. Outer combustion chamber of blast furnace stove is lined with __________ bricks.

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Q. Presence of MgO in alumino-silicate refractories __________ its refractoriness.

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