Refractory Technology Which is the most stable crystalline form of silica at room temperature? Cristobalite None of these Tridymite Quartz Cristobalite None of these Tridymite Quartz ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² . 250 65 450 150 250 65 450 150 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the Roof of electric furnaces Nuclear reactors, missiles & space crafts Hearth of the blast furnace Insulation of high temperature furnaces Roof of electric furnaces Nuclear reactors, missiles & space crafts Hearth of the blast furnace Insulation of high temperature furnaces ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Zirconia refractories are not used in High frequency induction furnaces in the form of inductors Furnaces subjected to fluctuating temperature Lining high temperature ceramic kilns Making sheaths for thermocouple High frequency induction furnaces in the form of inductors Furnaces subjected to fluctuating temperature Lining high temperature ceramic kilns Making sheaths for thermocouple ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following impurities reduces the refractoriness of magnesite bricks? Al2O₃ CaO SiO₂ All of these Al2O₃ CaO SiO₂ All of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent. 5-7 7-12 14-20 2-3 5-7 7-12 14-20 2-3 ANSWER DOWNLOAD EXAMIANS APP
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