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Refractory Technology

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

Chromite
Fireclay
Graphite
Carborundum

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Refractory Technology
Crushing strength of a refractory

Decreases with rise in service temperature
Decreases with increase in porosity
Increases with rise in service temperature
Is unaffected with change in service temperature

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Refractory Technology
Magnesite bricks are used in those parts of furnaces, which are

Subjected to high load
Subjected to temperature fluctuation
None of these
Required to resist corrosive basic slag

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Refractory Technology
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

700
1000
2000
1600

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Refractory Technology
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

2400
1800
2200
2700

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Refractory Technology
Chrome magnesite bricks are

Neutral in nature
Acidic in nature
Made by mixing 30% chromite and 70% periclase
Having higher RUL than silica bricks

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