Hamad Refractory Technology 18/06/2020 A. Silicon carbide B. Silicon nitride C. Crystalline magnesia D. Zirconium sulphate Related Mcqs: Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?A. 10 B. 100 C. 500 D. 1000... Zircon refractories have__________________?A. Low co-efficient of expansion B. High RUL (1600°C) and refractoriness (> 2000°C) C. High spalling resistance D. All A., B. and C.... Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?A. Tar bonded dolomite bricks B. Fireclay bricks C. Mullite bricks D. Magnesite bricks... Rate of slag attack on refractories increases with rise in temperature due to the___________________?A. Decreased viscosity of slag B. Increased thermal conductivity of brick C. Oxidising condition in the furnace D. None of these... Mullite is chemically represented by_________________?A. Al2O3. 2SiO2 B. 3Al2O3. 2SiO2 C. Al2O3. SiO2 D. 2Al2O3. 3SiO2...
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