Refractory Technology Thermal diffusivity of a refractory brick is high, when its __________ is high. Density Thermal conductivity Specific heat None of these Density Thermal conductivity Specific heat None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractories used in/for __________ should have low thermal conductivity. Insulation Muffle furnaces Regenerators Coke ovens Insulation Muffle furnaces Regenerators Coke ovens ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Presence of MgO in alumino-silicate refractories __________ its refractoriness. Lowers Increases Either A or B; depends on its quantity Does not affect Lowers Increases Either A or B; depends on its quantity Does not affect ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Zirconia refractory Can not be used as an insulator Is produced from baddeleyite Does not react with basic slags Has poor electrical conductivity at high temperature Can not be used as an insulator Is produced from baddeleyite Does not react with basic slags Has poor electrical conductivity at high temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Hot face insulating linings of high purity alumina fused mullite are used, where Very high temperatures are involved Presence of iron or silica is harmful Highly reducing conditions are involved All of these Very high temperatures are involved Presence of iron or silica is harmful Highly reducing conditions are involved All of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology SiO₂ percentage in firebrick is about 35-40 80-85 >94 55-60 35-40 80-85 >94 55-60 ANSWER DOWNLOAD EXAMIANS APP
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