Chemical Engineering :: Refractory Technology
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Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
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Pick out the wrong statement.
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__________ bricks should not be used in oxidising atmosphere.
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Pick out the wrong statement.
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Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
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Faster rate of drying of moulded refractories results in high __________ of refractories.
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Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
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A.
Refractories used in muffle furnace should have low thermal conductivity.
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B.
The electrical resistivity of refractories drops rapidly with rise in temperature.
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C.
For reducing spalling tendency, the refractory should be well fired and its porosity should be more.
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D.
Refractoriness under load (RUL) of a refractory is always less than its refractoriness.
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A.
Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks.
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B.
Graphite refractories are also called plumbago refractories.
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C.
Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
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D.
Calcined magnesite is also called dead burnt magnesite.
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