Discussion
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- Question
Thermal conductivity of refractory bricks
Options- A. increases with decrease in porosity.
- B. decreases with decreases in porosity.
- C. is independent of its porosity and is maximum for insulating bricks.
- D. increases with the amount of air entrapped in pores.
- Correct Answer
- increases with decrease in porosity.
- 1. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
Options- A. less shrinkage in heating, decreased apparent porosity & increased specific gravity.
- B. high strength & thermal spalling resistance.
- C. less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
- D. all (a), (b) and (c). Discuss
- 2. Fireclay bricks are not used in the
Options- A. blast furnace
- B. hot blast stove
- C. cupola
- D. wall of coke oven Discuss
- 3. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
Options- A. chrome or magnesite
- B. silicon carbide
- C. silica
- D. lowduty fireclay Discuss
- 4. Which is not a natural insulating material?
Options- A. Diatomaceous earth/kieselgur
- B. Asbestos
- C. Vermiculite
- D. None of these Discuss
- 5. Refractory bricks with lower permeability is produced by using
Options- A. higher firing temperature.
- B. higher moulding pressure.
- C. finer grog size.
- D. all (a), (b) and (c). Discuss
- 6. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
Options- A. bakelite impregnated or fused periclase
- B. silica
- C. semi-silica
- D. fireclay Discuss
- 7. Which is not an acidic refractory?
Options- A. Silica
- B. Fireclay
- C. High alumina refractory
- D. Carbon black Discuss
- 8. Which is an acidic refractory?
Options- A. Magnesite
- B. Dolomite
- C. Fireclay
- D. Chrome magnesite Discuss
- 9. Which form of silica has the highest specific gravity?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. All have the same specific gravity Discuss
- 10. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
Options- A. 55
- B. 70
- C. 80
- D. 90 Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: wall of coke oven
Correct Answer: chrome or magnesite
Correct Answer: None of these
Correct Answer: all (a), (b) and (c).
Correct Answer: bakelite impregnated or fused periclase
Correct Answer: Carbon black
Correct Answer: Fireclay
Correct Answer: Quartz
Correct Answer: 90
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