Refractory Technology Which of the following has the lowest electrical resistivity? Zircon Fireclay Alumina Graphite Zircon Fireclay Alumina Graphite ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Firing temperature of magnesite bricks is about __________ °C. 1600-1800 2400-2600 1000-1200 800-1000 1600-1800 2400-2600 1000-1200 800-1000 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C. 270 70 570 770 270 70 570 770 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion point of an acidic refractory material is Reduced by the addition of basic oxides Not affected by the addition of basic oxides Increased by the addition of basic oxides Not affected by the addition of basic oxides Reduced by the addition of basic oxides Not affected by the addition of basic oxides Increased by the addition of basic oxides Not affected by the addition of basic oxides ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling resistance of a refractory can not be increased by Using a coarser grog during its manufacture Decreasing its thermal co-efficient of expansion Increasing its porosity Making it denser Using a coarser grog during its manufacture Decreasing its thermal co-efficient of expansion Increasing its porosity Making it denser ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Magnesite chrome refractories Are not at all resistant to the corrosive action of iron oxide Have better spalling resistance than chrome magnesite refractories Have very low thermal co-efficient of expansion Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form Are not at all resistant to the corrosive action of iron oxide Have better spalling resistance than chrome magnesite refractories Have very low thermal co-efficient of expansion Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form ANSWER DOWNLOAD EXAMIANS APP
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