Refractory Technology problems
- 1. 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
Correct Answer: chrome or magnesite
- 2. Fireclay bricks are not used in the
Options- A. blast furnace
- B. hot blast stove
- C. cupola
- D. wall of coke oven Discuss
Correct Answer: wall of coke oven
- 3. 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
Correct Answer: all (a), (b) and (c).
- 4. 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. Discuss
Correct Answer: increases with decrease in porosity.
- 5. 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
Correct Answer: bakelite impregnated or fused periclase
- 6. Which is not an acidic refractory?
Options- A. Silica
- B. Fireclay
- C. High alumina refractory
- D. Carbon black Discuss
Correct Answer: Carbon black
- 7. Which is an acidic refractory?
Options- A. Magnesite
- B. Dolomite
- C. Fireclay
- D. Chrome magnesite Discuss
Correct Answer: Fireclay
- 8. Which form of silica has the highest specific gravity?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. All have the same specific gravity Discuss
Correct Answer: Quartz
- 9. 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
Correct Answer: 90
- 10. Permeability of bricks is a measure of the
Options- A. refractoriness.
- B. melting point.
- C. rate at which a fluid will pass through the pores.
- D. expansion during heating. Discuss
Correct Answer: rate at which a fluid will pass through the pores.
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