'Spinel', a refractory mineral is chemically represented as MgAl2O₃ MgAl2O₃.2H₂O MgSO₄ MgAl2O₄ TRUE ANSWER : ? YOUR ANSWER : ?
Refractoriness/fusion points of 'superduty' refractories is __________ °C. > 1730 1520-1630 > 2000 1630-1670 TRUE ANSWER : ? YOUR ANSWER : ?
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage? Magnesite bricks Mullite bricks Fireclay bricks Tar bonded dolomite bricks TRUE ANSWER : ? YOUR ANSWER : ?
Segar cones are used for the determination of __________ of refractories. Electrical conductivity Resistance to slag attack Spalling resistance Softening temperature TRUE ANSWER : ? YOUR ANSWER : ?
Fireclay bricks are used in the Flues Furnaces allowed to cool frequently Chimney linings All of these TRUE ANSWER : ? YOUR ANSWER : ?
__________ nozzles are used in continuous casting of steel, Carborundum Beryllia Zircon Thoria TRUE ANSWER : ? YOUR ANSWER : ?
Which is the stable form of silica below 870°C ? Cristobalite Tridymite None of these Quartz TRUE ANSWER : ? YOUR ANSWER : ?
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C. 1670 1630 1520 1730 TRUE ANSWER : ? YOUR ANSWER : ?
With increase in the alumina content, the refractoriness of high alumina refractories Remains same Increases May increase or decrease Decreases TRUE ANSWER : ? YOUR ANSWER : ?