A. Molten steel
B. Iron oxide
C. Lime slag
D. None of these
Related Mcqs:
- Tar dolomite bricks are used in the_________________?
A. Basic Bessemer converter
B. Basic open hearth furnace
C. Electric furnaces
D. All A., B. and C. - Magnesite bricks have poor resistance to attack by _____________ slag?
A. Lime
B. Basic
C. Acid
D. None of these - 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. - Tar bonded dolomite bricks__________________?
A. Are stored under controlled temperature & humidity to avoid hydration
B. Are used in outer lining of L.D. converters
C. Have poorer hydration resistance than pitch bonded bricks
D. All A., B. and C. - Silica bricks have low spalling resistance below 600°C, due to its________________?
A. Very high thermal conductivity
B. High co-efficient of expansion upto this temperature
C. High thermal diffusivity
D. Low refractoriness - Resistance to slag attack of a refractory _____________________?
A. Depends on the nature of slag & refractory
B. Decreases at higher temperature
C. Decreases, if defective joints & cracks exist in the refractory
D. All A., B. and C. - The linear thermal expansion of _______________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent?
A. Fireclay
B. Silica
C. Magnesite
D. Corundum - 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 - Roof of a basic electric furnace is made of _____________ bricks?
A. Superduty fireclay
B. Silica
C. Chromite
D. None of these - Refractory bricks having lower porosity have_________________________?
A. High insulating properties
B. Low heat capacity
C. Low thermal conductivity
D. Greater strength
