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

Related Mcqs:

1. Lower part of hot metal mixer are lined with _____________ bricks?

   A. Superduty fireclay
   B. High alumina
   C. Silica
   D. Carborundum

2. Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?

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

3. 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.

4. Bauxite calcining rotary kilns are lined with ________________ bricks?

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

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

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

6. Outer combustion chamber of blast furnace stove is lined with _____________ bricks?

   A. Fireclay
   B. Silica
   C. Chrome magnesite
   D. Zirconia

7. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?

   A. Bakelite impregnated or fused periclase
   B. Silica
   C. Semi-silica
   D. Fireclay

8. Semi-silica bricks compared to silica bricks have_______________?

   A. Less fusion point
   B. Better spalling resistance
   C. Both A. and B.
   D. Neither A. not B.

9. Chemically, mullite refractories is____________________?

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

10. Mullite is chemically represented by_________________?

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