Permeability of bricks is a measure of the_________________? A. Refractoriness B. Melting pointC. Rate at which a fluid will pass through the pores D. Expansion during heating

Fireclay bricks are not used in the_____________________? A. Blast furnace B. Hot blast stove C. CupolaD. Wall of coke oven

Thermal conductivity of refractory bricks_________________? A. Increases with decrease in porosity B. Decreases with decreases in porosity C. Is independent of its porosity and is maximum for insulating bricks D. Increases with the amount of air entrapped in pores

Fusion point of a basic refractory material is__________________? A. Reduced by the addition of acid oxides B. Increased by the addition of acid oxides C. Not affected by the addition of acid oxides D. Always less than 1000°C

Fireclay bricks are used in the__________________? A. Coke ovens regeneratorB. Outer lining of L.D. converter C. Hearth bottom of blast furnace D. Coke oven walls

In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ °C for 24 hours? A. 700 B. 1000C. 1600 D. 2000

Fireclay bricks is not used for lining the__________________? A. Cupola B. Gas producerC. Bottom of hot metal mixer D. Roof of open hearth furnace

Fireclay refractories____________________? A. Are not resistant to the action of basic slags B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc C. Shrink during firingD. All A., B. and C.

Silica bricks are never used for lining the____________________? A. Beehive coke ovens B. By-product coke ovens C. Dome of blast furnace stoves D. Roof of open hearth furnace

Refractory bricks having lower porosity have_________________________? A. High insulating properties B. Low heat capacity C. Low thermal conductivityD. Greater strength