Refractory Technology Thermal diffusivity of a refractory brick is high, when its __________ is high. Density Thermal conductivity Specific heat None of these Density Thermal conductivity Specific heat None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With decrease in porosity, the __________ of the refractories decreases. Strength None of these Spalling resistance Thermal conductivity Strength None of these Spalling resistance Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Tar bonded dolomite bricks Have poorer hydration resistance than pitch bonded bricks All of these Are stored under controlled temperature & humidity to avoid hydration Are used in outer lining of L.D. converters Have poorer hydration resistance than pitch bonded bricks All of these Are stored under controlled temperature & humidity to avoid hydration Are used in outer lining of L.D. converters ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage? Fireclay bricks Mullite bricks Tar bonded dolomite bricks Magnesite bricks Fireclay bricks Mullite bricks Tar bonded dolomite bricks Magnesite bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following impurities reduces the refractoriness of magnesite bricks? SiO₂ CaO Al2O₃ All of these SiO₂ CaO Al2O₃ 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 2-3 14-20 7-12 5-7 2-3 14-20 7-12 ANSWER DOWNLOAD EXAMIANS APP
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