Refractory Technology Which of the following impurities reduces the refractoriness of magnesite bricks? All of these SiO₂ CaO Al2O₃ All of these SiO₂ CaO Al2O₃ ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology __________ bricks are used in the burning zone of a cement rotary kiln. Fireclay Thoria Silicon carbide High alumina Fireclay Thoria Silicon carbide High alumina ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Magnesite chrome refractories Have very low thermal co-efficient of expansion Have better spalling resistance than chrome magnesite refractories 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 very low thermal co-efficient of expansion Have better spalling resistance than chrome magnesite refractories 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 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Hot face insulating linings of high purity alumina fused mullite are used, where All of these Highly reducing conditions are involved Presence of iron or silica is harmful Very high temperatures are involved All of these Highly reducing conditions are involved Presence of iron or silica is harmful Very high temperatures are involved ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C. 1520 1380 1915 1710 1520 1380 1915 1710 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With decrease in porosity, the __________ of the refractories decreases. None of these Spalling resistance Strength Thermal conductivity None of these Spalling resistance Strength Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP