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Refractory Technology

Refractory Technology
__________ bricks are used in the burning zone of a cement rotary kiln.

Thoria
Silicon carbide
High alumina
Fireclay

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Refractory Technology
Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.

1915
1520
1710
1380

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Refractory Technology
__________ is not a single oxiderefractory.

Zirconia
Silicon carbide
None of these
Magnesia

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Refractory Technology
Conversion of silica mineral to cristobalite is accompanied by reduction in its

Specific gravity
Volume
Both A & B
Neither A nor B

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Refractory Technology
Rate of slag attack on refractories increases with rise in temperature due to the

Increased thermal conductivity of brick
Decreased viscosity of slag
Oxidising condition in the furnace
None of these

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Refractory Technology
10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

Crushing strength
Spalling resistance
Resistance to slag
Refractoriness

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