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Refractory Technology

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

30
15
20
10

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Refractory Technology
Roof of a basic electric furnace is made of __________ bricks.

Chromite
Silica
Superduty fireclay
None of these

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

1520-1630
1630-1670
> 2000
> 1730

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

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

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Refractory Technology
Silicon carbide refractories are used in the

Ceramic recuperators
Muffle furnace
All of these
Zinc smelting furnace

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Refractory Technology
Porosity is induced in insulating refractories by adding

Calcium phosphate
Ammonium chloride/sulphate
All of these
Powdered naphthalene

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