Refractory Technology Which form of silica has the highest specific gravity? Cristobalite Quartz Tridymite All of these Cristobalite Quartz Tridymite All of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Lower part of hot metal mixer are lined with __________ bricks. Silica Superduty fireclay High alumina Carborundum Silica Superduty fireclay High alumina Carborundum ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Grog addition in fireclay during brick manufacture is done to Reduce its shrinkage on heating Enhance the strength of fired refractories All of these Impart greater spalling resistance Reduce its shrinkage on heating Enhance the strength of fired refractories All of these Impart greater spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Porosity is induced in insulating refractories by adding Calcium phosphate Ammonium chloride/sulphate All of these Powdered naphthalene Calcium phosphate Ammonium chloride/sulphate All of these Powdered naphthalene ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of Crucibles used for melting of high purity metals Muffles for muffle furnaces Insulating bricks Segar cones Crucibles used for melting of high purity metals Muffles for muffle furnaces Insulating bricks Segar cones ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology What is Thoria? All of these Which is expensive & radioactive, is used in crucibles for melting high purity metals Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock Thoria Has high resistance to basic slags All of these Which is expensive & radioactive, is used in crucibles for melting high purity metals Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock Thoria Has high resistance to basic slags ANSWER DOWNLOAD EXAMIANS APP
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