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Refractory Technology

Refractory Technology
Which of the following has the lowest electrical resistivity?

Alumina
Zircon
Graphite
Fireclay

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Refractory Technology
Thermal spalling mainly occurs during __________ of furnaces.

Cooling down
Neither A nor B
Warming up
Both A & B

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

Zircon
Beryllia
Carborundum
Thoria

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Refractory Technology
Chrome magnesite brick is not used for lining the

Coke oven regenerator
Burning zone of limestone rotary kilns
Hearth of soaking pits
Bottom hearth of reheating furnace

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Refractory Technology
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?

Fireclay bricks
Magnesite bricks
Tar bonded dolomite bricks
Mullite bricks

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Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Either A or B; depends on its quantity
Increases
Lowers
Does not affect

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