A. Washing action of metal
B. Corrosion by layer of slag
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- Lower part of hot metal mixer are lined with _____________ bricks?
A. Superduty fireclay
B. High alumina
C. Silica
D. Carborundum - Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
A. Silica
B. Fireclay
C. Magnesite
D. Zirconia - 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. - Bauxite calcining rotary kilns are lined with ________________ bricks?
A. Fireclay
B. Carbon
C. 85% alumina
D. Corundum - Roof of a basic open hearth furnace is lined with ______________ bricks?
A. Silica
B. Fireclay
C. Dolomite
D. Magnesite - Outer combustion chamber of blast furnace stove is lined with _____________ bricks?
A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia - 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 - 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. - Chemically, mullite refractories is____________________?
A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2 - Mullite is chemically represented by_________________?
A. Al2O3. 2SiO2
B. 3Al2O3. 2SiO2
C. Al2O3. SiO2
D. 2Al2O3. 3SiO2
Mcq Added by: admin
