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Refractory Technology

Refractory Technology
Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.

14-20
5-7
2-3
7-12

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Refractory Technology
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of

Corrundum
Siliceous fireclay
Silicon carbide
Fireclay

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Refractory Technology
Refractoriness under load (RUL) is the most important property for the refractory bricks

Used for furnace insulation
Used in the roof of the furnace
None of these
At the hearth bottom of the furnace on which stock is placed

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Refractory Technology
Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.

60 and 40
50 and 50
20 and 80
80 and 20

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Refractory Technology
Chrome magnesite bricks are

Having higher RUL than silica bricks
Acidic in nature
Neutral in nature
Made by mixing 30% chromite and 70% periclase

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Refractory Technology
Refractoriness/fusion points of 'superduty' refractories is __________ °C.

> 2000
1630-1670
> 1730
1520-1630

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