PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?

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Bauxite calcining rotary kilns are lined with ________________ bricks?

A. Fireclay B. Carbon C. 85% alumina D. Corundum...

Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the_______________?

A. Hearth of the blast furnace B. Nuclear reactors, missiles & space crafts C. Insulation of high temperature furnaces D. Roof of electric furnaces...

Quartz is___________________?

A. Stable form of silica upto 870°C B. Converted to Tridymite on firing between 870 to 1470°C C. Transformed to Cristobalite on heating above 1470°C D. All A., B. and C....

Pick out the wrong statement ?

A. Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces B. Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators C. Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity D. Electrical conductivity of porous refractory … Pick out the wrong statement ?Read More...

Highest melting (m.p = 3070°C) oxide refractory is__________________?

A. Alumina B. Thoria C. Zirconia D. Magnesia...