Refractory Technology problems
- 1. Tar bonded dolomite bricks
Options- 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) Discuss
Correct Answer: all (a), (b) and (c)
- 2. High density refractory bricks have lower
Options- A. spalling resistance.
- B. thermal conductivity.
- C. fusion point.
- D. slag penetration resistance. Discuss
Correct Answer: spalling resistance.
- 3. Periclase refractory contains mainly
Options- A. CaO
- B. MgO
- C. Al2O3
- D. SiO2 Discuss
Correct Answer: MgO
- 4. Carbon refractory blocks
Options- A. are wetted by molten iron.
- B. are used in the hearth of blast furnace.
- C. are acidic in nature.
- D. all (a), (b) and (c). Discuss
Correct Answer: are used in the hearth of blast furnace.
- 5. Fusion point of an acidic refractory material is
Options- A. increased by the addition of basic oxides.
- B. reduced by the addition of basic oxides.
- C. not affected by the addition of basic oxides.
- D. always more than 2500°C. Discuss
Correct Answer: reduced by the addition of basic oxides.
- 6. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
Options- A. 10
- B. 100
- C. 500
- D. 1000 Discuss
Correct Answer: 1000
- 7. Cold crushing strength of refractories depends upon its
Options- A. composition
- B. texture
- C. firing temperature
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 8. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?
Options- A. Tar bonded dolomite bricks
- B. Fireclay bricks
- C. Mullite bricks
- D. Magnesite bricks Discuss
Correct Answer: Tar bonded dolomite bricks
- 9. Which is a basic refractory?
Options- A. Fireclay
- B. Silica
- C. Chrome magnesite
- D. None of these Discuss
Correct Answer: Chrome magnesite
- 10. Silicon carbide refractories are used in the
Options- A. muffle furnace
- B. zinc smelting furnace
- C. ceramic recuperators
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
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