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Refractory Technology

Refractory Technology
Cold crushing strength of fireclay bricks is about __________ kgf/cm².

500-1000
100-150
50-100
200-400

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

None of these
Tridymite
Cristobalite
Quartz

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Refractory Technology
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

30
20
10
15

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Refractory Technology
To resist spalling tendency, a refractory should have

Low thermal co-efficient of expansion
All of these
Greater diffusivity
Low specific heat

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Refractory Technology
Dolomite bricks have good resistance to attack by

Lime slag
Iron oxide
None of these
Molten steel

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Refractory Technology
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?

Chemically prepared foam
Saw dust
Sand
Cork

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