High refractoriness of refractory bricks means, that it has a________________?

Related Mcqs:

1. Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?

   A. At the hearth bottom of the furnace on which stock is placed B. Used for furnace insulation C. Used in the roof of the furnace D. None of these...

2. Which of the following impurities reduces the refractoriness of magnesite bricks ?

   A. Al2O3 B. CaO C. SiO2 D. All A., B. & C....

3. . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?

   A. 500 B. 1000 C. >1350 D. >2000...

4. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

   A. Fireclay B. Silica C. Dolomite D. Very low alumina...

5. High porosity refractory bricks have _______________?

   A. Poor resistance to the penetration of molten slag, metal & flue gases B. Poor heat conductivity & low strength C. Better thermal spalling resistance D. All A., B. and C....

6. High density refractory bricks have lower__________________?

   A. Spalling resistance B. Thermal conductivity C. Fusion point D. Slag penetration resistance...

7. High alumina refractory compared to fireclay bricks have____________________?

   A. Less load bearing capacity B. Less resistance to slag attack C. Low refractoriness D. High resistance to thermal shock and creep...

8. Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?

   A. Pottery furnace B. Glass melting furnace C. Crucibles D. Gas retorts...

9. Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?

   A. 5 B. 20 C. 40 D. 55...

10. Refractory bricks with lower permeability is produced by using __________________?

    A. Higher firing temperature B. Higher moulding pressure C. Finer grog size D. All A., B. and C....