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Refractory Technology

Refractory Technology
Which of the following is not a neutral refractory?

Graphite
Chromite
Silicon carbide
Magnesite

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Refractory Technology
Refractories used in/for __________ should have low thermal conductivity.

Insulation
Coke ovens
Muffle furnaces
Regenerators

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Refractory Technology
'Super refractories' are made from pure

Oxides
Borides
Nitrides
Carbides

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Refractory Technology
Which of the following impurities reduces the refractoriness of magnesite bricks?

CaO
All of these
SiO₂
Al2O₃

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Refractory Technology
Bottom of basic open hearth furnace are constructed of

Semi-silica bricks
Silicon carbide bricks
Porous fireclay bricks
Dead burnt magnesite ramming mass

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

MgSO₄
MgAl2O₃.2H₂O
MgAl2O₄
MgAl2O₃

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