Q. Roof of a basic electric furnace is made of __________ bricks.

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Q. High density refractory bricks have lower

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Q. Silliminite (Al₂O₃.SiO₂) refractory, which is a neutral refractory, is not used in

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Q. Zircon refractories have

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Q. Cermets are

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Q. Carbon refractory blocks

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Q. Which is the most stable crystalline form of silica at room temperature ?

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Q. Silica refractories

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

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Q. Which of the following is not an acidic refractory ?

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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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