Refractory Technology Which is the stable form of silica between 1470°C and the melting point 1713°C ? Quartz Tridymite Cristobalite None of these Quartz Tridymite Cristobalite None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C. 1630 1670 1520 1730 1630 1670 1520 1730 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling resistance of a refractory can not be increased by Using a coarser grog during its manufacture Increasing its porosity Making it denser Decreasing its thermal co-efficient of expansion Using a coarser grog during its manufacture Increasing its porosity Making it denser Decreasing its thermal co-efficient of expansion ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Vacuum steel degassing units are lined with Low duty firebricks High alumina bricks Silica bricks Graphite blocks Low duty firebricks High alumina bricks Silica bricks Graphite blocks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Hot face insulating linings of high purity alumina fused mullite are used, where Presence of iron or silica is harmful All of these Highly reducing conditions are involved Very high temperatures are involved Presence of iron or silica is harmful All of these Highly reducing conditions are involved Very high temperatures are involved ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Roof of a basic open hearth furnace is lined with __________ bricks. Dolomite Magnesite Fireclay Silica Dolomite Magnesite Fireclay Silica ANSWER DOWNLOAD EXAMIANS APP
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