Mullite is chemically represented by_________________?

Related Mcqs:

1. Chemically, mullite refractories is____________________?

   A. 3Al2O3.2SiO2 B. Al2O3 C. ZrSO4 D. ThO2...

2. ‘Spinel’, a refractory mineral is chemically represented as____________________?

   A. MgAl2O4 B. MgAl2O3 C. MgSO4 D. MgAl2O3.2H2O...

3. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?

   A. Washing action of metal B. Corrosion by layer of slag C. Both A. & B. D. Neither A. nor B....

4. Hot face insulating linings of high purity alumina fused mullite are used, where_________________?

   A. Very high temperatures are involved B. Highly reducing conditions are involved C. Presence of iron or silica is harmful D. All A., B. and C....

5. Roof of a basic open hearth furnace is lined with ______________ bricks?

   A. Silica B. Fireclay C. Dolomite D. Magnesite...

6. _____________ is not a single oxide-refractory?

   A. Zirconia B. Silicon carbide C. Magnesia D. None of these...

7. Pyrometric cone equivalent (PCE) value (Segar cone) of ‘Superduty refractories’ is more than 33 which corresponds to a temperature of _____________ °C?

   A. 1520 B. 1630 C. 1670 D. 1730...

8. Chromite refractories are used in_______________?

   A. Bottom of soaking pits B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other C. Both A. & B. D. Neither A. and B....

9. Which is not a high alumina refractory ?

   A. Mullite B. Corundum C. Bauxite D. Dolomite...

10. Dilatometer is used for the determination of ______________ of refractories?

    A. Modulus of rupture B. Permanent linear change C. Resistance to CO attack D. RUL...