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Refractory Technology

Refractory Technology
An indication of degree of firing in silica brick is its

None of these
Fusion point
RUL
Specific gravity

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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.

1730
1520
1630
1670

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Refractory Technology
Chrome magnesite is not used in the

Inner lining of L.D. converter
All of these
Aluminium melting furnaces
Wear out lining of steel melting furnaces

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Refractory Technology
Porosity is induced in insulating refractories by adding

All of these
Powdered naphthalene
Ammonium chloride/sulphate
Calcium phosphate

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Refractory Technology
Carborundum used for making crucibles for melting non-ferrous metals is chemically

Crystalline magnesia
Silicon carbide
Zirconium sulphate
Silicon nitride

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Refractory Technology
Semi-silica bricks compared to silica bricks have

Both A & B
Neither A nor B
Less fusion point
Better spalling resistance

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