Q. Thermal spalling mainly occurs during __________ of furnaces.

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Q. Which is an acidic refractory ?

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Q. Carborundum used for making crucibles for melting non-ferrous metals is chemically

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Q. Which of the following impurities reduces the refractoriness of magnesite bricks ?

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Q. Crushing strength of a refractory

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Q. Ramming masses are used for

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Q. Pick out the wrong statement.

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Q. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.

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Q. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in

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Q. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

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Q. Fireclay refractories

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Q. Which is not a high alumina refractory ?

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Q. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

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Q. Faster rate of drying of moulded refractories results in high __________ of refractories.

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Q. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

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Q. The highest melting pure oxide (m.p. > 3000°C) is

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Q. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

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Q. Which is not an acidic refractory ?

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Q. Natural silica

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Q. Thermal conductivity of refractory bricks

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