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Refractory Technology

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

Carborundum
Zircon
Thoria
Beryllia

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Refractory Technology
Addition of zircon to silica refractory brick improves its

Crushing strength
Resistance to slag attack
Neither A nor B
Neither A nor B

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Refractory Technology
Permeability of bricks is a measure of the

Rate at which a fluid will pass through the pores
Refractoriness
Expansion during heating
Melting point

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Refractory Technology
Pyrometric cone equivalent (PCE) of a refractory is the measure of its

Resistance to carbon monoxide attack
Resistance to slag penetration
Fusion point
Spalling resistance

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

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

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Refractory Technology
Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

Plaster of paris
Lime
Water
Aluminium phosphate

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