Q181
Open questionBeryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except
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Chemical Engineering · all questionsRefractory Technology
Refractory Technology
practice.
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220
Questions
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Q182
Open questionSiO2 percentage in firebrick is about
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Q183
Open questionRefractories are dried in the
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Q184
Open questionRefractoriness/fusion points of 'superduty' refractories is __________ °C.
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Q185
Open questionRefractoriness/fusion points of 'superduty' refractories is __________ °C.
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Q186
Open questionAn 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?
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Q187
Open questionWhich of the following does not occur during firing/burning of refractories?
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Q188
Open questionRate of slag attack on refractories increases with rise in temperature due to the
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Q189
Open question__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
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Q190
Open questionBottom of basic open hearth furnace are constructed of
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Q191
Open questionPick out the wrong statement.
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Q192
Open questionHigh refractorinness of refractory bricks means, that it has a
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Q193
Open questionCold crushing strength of fireclay bricks is about __________ kgf/cm2.
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Q194
Open questionMaximum apparent porosity of magnesite bricks is about __________ percent.
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Q195
Open questionPick out the wrong statement.
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Q196
Open questionSpalling tendency of refractories is reduced by increasing its
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Q197
Open questionWith increase in the alumina content, the refractoriness of high alumina refractories
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Q198
Open questionWhich of the following bricks should not be used, if the furnace is to be used intermit-tantly?
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Q199
Open questionCrushing strength of a refractory
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Q200
Open questionSilica refractories
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