Refractory Technology problems
- 1. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
Options- A. Soaking pits
- B. Ceheating furnace
- C. L.D. converter
- D. Rotary lime kiln Discuss
Correct Answer: L.D. converter
- 2. Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in
Options- A. pottery furnace
- B. glass melting furnace
- C. crucibles
- D. gas retorts Discuss
Correct Answer: gas retorts
- 3. Periclase is
Options- A. crystalline form of MgO.
- B. MgCO3.
- C. ZrSO4.
- D. amorphous magnesite. Discuss
Correct Answer: crystalline form of MgO.
- 4. Basic bricks are not made of
Options- A. fireclay
- B. magnesite
- C. foresterite
- D. chromite Discuss
Correct Answer: fireclay
- 5. Chrome magnesite bricks are used in the
Options- A. side walls of soaking pits and arc furnaces.
- B. copper melting furnaces & converters.
- C. burner block of glass tanks.
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 6. Ferromagnetic ceramic material is not used in the
Options- A. thermal insulation
- B. transformers
- C. magnetic switches
- D. television sets Discuss
Correct Answer: thermal insulation
- 7. Insulating refractories should have
Options- A. high porosity
- B. low thermal conductivity
- C. both (a) and (b)
- D. neither (a) not (b) Discuss
Correct Answer: low thermal conductivity
- 8. Cold crushing strength of a refractory does not depend upon its
Options- A. shape
- B. composition
- C. firing temperature
- D. texture Discuss
Correct Answer: shape
- 9. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
Options- A. 1520
- B. 1630
- C. 1670
- D. 1730 Discuss
Correct Answer: 1730
- 10. Which one contains maximum percentage of Al2O3?
Options- A. Firebrick
- B. Sillimanite
- C. Magnesite
- D. Aluminous firebrick Discuss
Correct Answer: Sillimanite
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