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Refractory Technology

Refractory Technology
Lower part of hot metal mixer are lined with __________ bricks.

High alumina
Carborundum
Silica
Superduty fireclay

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Refractory Technology
Which is not a basic refractory?

Dolomite
Magnesite
Silicon carbide
Chrome magnesite

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Refractory Technology
Dolomite bricks have good resistance to attack by

Lime slag
Iron oxide
None of these
Molten steel

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Refractory Technology
Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.

500
>1350
>2000
1000

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Refractory Technology
__________ nozzles are used in continuous casting of steel,

Thoria
Carborundum
Zircon
Beryllia

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Refractory Technology
Spalling resistance of a refractory can not be increased by

Using a coarser grog during its manufacture
Increasing its porosity
Decreasing its thermal co-efficient of expansion
Making it denser

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