Refractory Technology Natural silica All of these Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes Is not stable at high temperature Mainly contains quartz All of these Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes Is not stable at high temperature Mainly contains quartz ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling resistance of a refractory can not be increased by Increasing its porosity Using a coarser grog during its manufacture Making it denser Decreasing its thermal co-efficient of expansion Increasing its porosity Using a coarser grog during its manufacture Making it denser Decreasing its thermal co-efficient of expansion ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C. >1350 1000 500 >2000 >1350 1000 500 >2000 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thermal conductivity of refractory bricks Decreases with decreases in porosity Is independent of its porosity and is maximum for insulating bricks Increases with the amount of air entrapped in pores Increases with decrease in porosity Decreases with decreases in porosity Is independent of its porosity and is maximum for insulating bricks Increases with the amount of air entrapped in pores Increases with decrease in porosity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Mixing of ground refractory material and water is done in a __________ mill. Pug Tube Ball Rod Pug Tube Ball Rod ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following does not occur during firing/burning of refractories? Development of stable mineral form Removal of water of hydration Decrease in crushing strength Vitrification Development of stable mineral form Removal of water of hydration Decrease in crushing strength Vitrification ANSWER DOWNLOAD EXAMIANS APP
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