Refractory Technology Addition of grog in fireclay brick during its manufacture is advantageous, because it results in Less shrinkage in heating, decreased apparent porosity & increased specific gravity High strength & thermal spalling resistance All of these Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production Less shrinkage in heating, decreased apparent porosity & increased specific gravity High strength & thermal spalling resistance All of these Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology High refractorinness of refractory bricks means, that it has a High spalling resistance Low porosity High resistance to fusion Low spalling resistance High spalling resistance Low porosity High resistance to fusion Low spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent. 2-3 5-7 7-12 14-20 2-3 5-7 7-12 14-20 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which one contains minimum percentage of SiO₂? Sillimanite Semi-silica Aluminous firebrick Firebrick Sillimanite Semi-silica Aluminous firebrick Firebrick ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory Castables Cements Mortars None of these Castables Cements Mortars None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With increase in the alumina content, the refractoriness of high alumina refractories Remains same May increase or decrease Decreases Increases Remains same May increase or decrease Decreases Increases ANSWER DOWNLOAD EXAMIANS APP
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