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Refractory Technology

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

1730
1630
1520
1670

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Refractory Technology
Tar dolomite bricks are used in the

Basic Bessemer converter
All of these
Electric furnaces
Basic open hearth furnace

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Refractory Technology
Mullite is chemically represented by

Al2O₃ . 2SiO₂
2Al2O₃ . 3SiO₂
3Al2O₃ . 2SiO₂
Al2O₃ . SiO₂

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Refractory Technology
Segar cones are used for the determination of __________ of refractories.

Resistance to slag attack
Electrical conductivity
Spalling resistance
Softening temperature

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Refractory Technology
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?

Chemically prepared foam
Cork
Sand
Saw dust

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Refractory Technology
Which is the stable form of silica between 1470°C and the melting point 1713°C ?

Quartz
None of these
Cristobalite
Tridymite

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