Refractory Technology An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture? Sand Chemically prepared foam Saw dust Cork Sand Chemically prepared foam Saw dust Cork ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Crushing strength of a refractory Is unaffected with change in service temperature Decreases with increase in porosity Increases with rise in service temperature Decreases with rise in service temperature Is unaffected with change in service temperature Decreases with increase in porosity Increases with rise in service temperature Decreases with rise in service temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractory bricks with lower permeability is produced by using All of these Finer grog size Higher firing temperature Higher moulding pressure All of these Finer grog size Higher firing temperature Higher moulding pressure ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is not an alumino-silicate refractory? High alumina bricks Mullite bricks Fireclay bricks Tar dolomite bricks High alumina bricks Mullite bricks Fireclay bricks Tar dolomite bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thermal conductivity of refractory bricks Increases with the amount of air entrapped in pores Increases with decrease in porosity Is independent of its porosity and is maximum for insulating bricks Decreases with decreases in porosity Increases with the amount of air entrapped in pores Increases with decrease in porosity Is independent of its porosity and is maximum for insulating bricks Decreases with decreases in porosity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Electrical resistor bars are made of Silicon carbide Graphite Zirconia Alumina Silicon carbide Graphite Zirconia Alumina ANSWER DOWNLOAD EXAMIANS APP
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