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Refractory Technology

Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Zirconia
Thoria
Magnesia
Alumina

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Refractory Technology
'Spinel', a refractory mineral is chemically represented as

MgAl2O₃.2H₂O
MgAl2O₄
MgAl2O₃
MgSO₄

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Refractory Technology
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

1630
1670
1520
1730

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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
15
10

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Refractory Technology
Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?

High resistance to spalling
All of these
High strength and density
High refractoriness

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Refractory Technology
Outer combustion chamber of blast furnace stove is lined with __________ bricks.

Chrome magnesite
Fireclay
Silica
Zirconia

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