Refractory Technology Natural silica Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes All of these Is not stable at high temperature Mainly contains quartz Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes All of these Is not stable at high temperature Mainly contains quartz ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite. Crushing strength Resistance to slag Spalling resistance Refractoriness Crushing strength Resistance to slag Spalling resistance Refractoriness ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is the stable form of silica below 870°C ? Cristobalite Tridymite None of these Quartz Cristobalite Tridymite None of these Quartz ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following has the lowest electrical resistivity? Graphite Zircon Alumina Fireclay Graphite Zircon Alumina Fireclay ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material? Plaster of paris Water Lime Aluminium phosphate Plaster of paris Water Lime Aluminium phosphate ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C. 70 270 770 570 70 270 770 570 ANSWER DOWNLOAD EXAMIANS APP
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