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Refractory Technology

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

Zircon
Carborundum
Thoria
Beryllia

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Refractory Technology
Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.

1520
1730
1630
1670

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Refractory Technology
Panel test determines the __________ of refractories.

Fusion point
Refractoriness under load (RUL)
Spalling resistance
Slag penetration resistance

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Refractory Technology
With increase in the alumina content, the refractoriness of high alumina refractories

Increases
Remains same
May increase or decrease
Decreases

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Refractory Technology
Which is the stable form of silica below 870°C ?

Quartz
Tridymite
Cristobalite
None of these

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Refractory Technology
High alumina refractories are used in the

All of these
Dome of blast furnace stoves
Glass melting furnaces
Electric arc furnace roof

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