Refractory Technology Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except Electrical conductivity Thermal conductivity Cost Fusion point Electrical conductivity Thermal conductivity Cost Fusion point ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thermal diffusivity of a refractory brick is high, when its __________ is high. Specific heat Density Thermal conductivity None of these Specific heat Density Thermal conductivity None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C. 1520 1670 1730 1630 1520 1670 1730 1630 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Presence of MgO in alumino-silicate refractories __________ its refractoriness. Either A or B; depends on its quantity Increases Lowers Does not affect Either A or B; depends on its quantity Increases Lowers Does not affect ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology High refractorinness of refractory bricks means, that it has a Low spalling resistance Low porosity High resistance to fusion High spalling resistance Low spalling resistance Low porosity High resistance to fusion High spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C. 570 770 270 70 570 770 270 70 ANSWER DOWNLOAD EXAMIANS APP
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