Carbon bricks are not used in the lining of the Highly chemical resistant equipments Blast furnace hearth Electric furnaces Combustion chamber of blast furnace stoves TRUE ANSWER : ? YOUR ANSWER : ?
Hot face insulating linings of high purity alumina fused mullite are used, where Highly reducing conditions are involved Very high temperatures are involved Presence of iron or silica is harmful All of these TRUE ANSWER : ? YOUR ANSWER : ?
Conversion of silica mineral to cristobalite is accompanied by reduction in its Specific gravity Neither A nor B Volume Both A & B TRUE ANSWER : ? YOUR ANSWER : ?
Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C. 1520 1730 1630 1670 TRUE ANSWER : ? YOUR ANSWER : ?
Which furnace consumes maximum refractory annually in an integrated steel plant? Coke ovens L.D. converter Soaking pit Blastfurnace TRUE ANSWER : ? YOUR ANSWER : ?
Silica refractories Can not be used in the dome of hot blast stoves Crack when subjected to sudden change of temperature Have lower thermal conductivity than fireclay bricks All of these TRUE ANSWER : ? YOUR ANSWER : ?
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours. 2000 1000 1600 700 TRUE ANSWER : ? YOUR ANSWER : ?
Graphite or carbon refractories Exihibit wetting characteristics Are not resistant to corrosion by slag Should be used in neutral or reducing atmosphere Exhibit high shrinkage on thermal treatment TRUE ANSWER : ? YOUR ANSWER : ?
Chromite refractories are used in Bottom of soaking pits Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other Neither A nor B Both A & B TRUE ANSWER : ? YOUR ANSWER : ?
Which one contains minimum percentage of SiO₂? Firebrick Aluminous firebrick Semi-silica Sillimanite TRUE ANSWER : ? YOUR ANSWER : ?