Refractory Technology What is Thoria? Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock All of these Which is expensive & radioactive, is used in crucibles for melting high purity metals Thoria Has high resistance to basic slags Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock All of these Which is expensive & radioactive, is used in crucibles for melting high purity metals Thoria Has high resistance to basic slags ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica bricks are never used for lining the Beehive coke ovens Roof of open hearth furnace Dome of blast furnace stoves By-product coke ovens Beehive coke ovens Roof of open hearth furnace Dome of blast furnace stoves By-product coke ovens ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Test piece for determination of RUL of a refractory is heated in a/an Neutral atmosphere Reducing atmosphere Electric furnace Oxidising atmosphere Neutral atmosphere Reducing atmosphere Electric furnace Oxidising atmosphere ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Permeability of bricks is a measure of the Refractoriness Rate at which a fluid will pass through the pores Expansion during heating Melting point Refractoriness Rate at which a fluid will pass through the pores Expansion during heating Melting point ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following bricks should not be used, if the furnace is to be used intermit-tantly? Sillimanite Silica bricks Silicon carbide bricks Firebricks Sillimanite Silica bricks Silicon carbide bricks Firebricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling resistance of a refractory can not be increased by Decreasing its thermal co-efficient of expansion Making it denser Increasing its porosity Using a coarser grog during its manufacture Decreasing its thermal co-efficient of expansion Making it denser Increasing its porosity Using a coarser grog during its manufacture ANSWER DOWNLOAD EXAMIANS APP
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