Q. Insulating refractories should have

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Q. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .

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Q. Zirconia refractory

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Q. Which one contains maximum percentage of Al₂O₃ ?

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Q. Which of the following does not occur during firing/burning of refractories ?

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Q. Silicon carbide refractories are used in the

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Q. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.

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Q. Fireclay bricks are never used in the

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Q. With increasing alumina content, the fusion point of high alumina refractories

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Q. Chrome magnesite bricks are used in the

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Q. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².

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Q. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?

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Q. __________ nozzles are used in continuous casting of steel.

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Q. Silicon carbide refractories have very low

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Q. Basic bricks are not made of

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Q. With increase in the alumina content in firebricks, its fusion point (refractoriness)

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Q. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

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Q. Fusion point of an acidic refractory material is

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Q. Which is required in an insulating refractory ?

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Q. 'Super refractories' are made from pure

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