Refractory Technology Presence of MgO in alumino-silicate refractories __________ its refractoriness. Does not affect Lowers Either A or B; depends on its quantity Increases Does not affect Lowers Either A or B; depends on its quantity Increases ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory Mortars None of these Cements Castables Mortars None of these Cements Castables ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Magnesite refractories have low resistance to Abrasion Attack by basic slag Disintegration on sudden change of temperature Both B and C Abrasion Attack by basic slag Disintegration on sudden change of temperature Both B and C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractories used in/for __________ should have low thermal conductivity. Coke ovens Regenerators Muffle furnaces Insulation Coke ovens Regenerators Muffle furnaces Insulation ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is the stable form of silica between 1470°C and the melting point 1713°C ? Cristobalite None of these Quartz Tridymite Cristobalite None of these Quartz Tridymite ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thermal spalling mainly occurs during __________ of furnaces. Neither A nor B Warming up Cooling down Both A & B Neither A nor B Warming up Cooling down Both A & B ANSWER DOWNLOAD EXAMIANS APP
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