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Refractory Technology

Refractory Technology
Which is not an alumino-silicate refractory?

Mullite bricks
Tar dolomite bricks
Fireclay bricks
High alumina bricks

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Refractory Technology
Cold crushing strength of refractories depends upon its

Composition
All of these
Firing temperature
Texture

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Refractory Technology
With decrease in porosity, the __________ of the refractories decreases.

None of these
Strength
Spalling resistance
Thermal conductivity

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

Zircon
Alumina
Fireclay
Graphite

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Refractory Technology
Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.

1915
1520
1710
1380

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Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Does not affect
Either A or B; depends on its quantity
Increases
Lowers

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