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Refractory Technology

Refractory Technology
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

Carborundum
Graphite
Fireclay
Chromite

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

MgAl2O₃
MgSO₄
MgAl2O₃.2H₂O
MgAl2O₄

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Refractory Technology
Conversion of silica mineral to cristobalite is accompanied by reduction in its

Specific gravity
Neither A nor B
Both A & B
Volume

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Refractory Technology
Which of the following has the lowest electrical resistivity?

Graphite
Zircon
Fireclay
Alumina

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Refractory Technology
'Super refractories' are made from pure

Borides
Oxides
Carbides
Nitrides

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Refractory Technology
Ferromagnetic ceramic material is not used in the

Transformers
Magnetic switches
Thermal insulation
Television sets

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