Discussion
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- Question
Porosity of silica bricks varies from __________ percent.
Options- A. 5 to 10
- B. 20 to 30
- C. 45 to 60
- D. 60 to 75
- Correct Answer
- 20 to 30
- 1. Magnesite bricks have poor resistance to attack by __________ slag.
Options- A. lime
- B. basic
- C. acid
- D. none of these Discuss
- 2. __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
Options- A. High thermal conductivity
- B. Low porosity
- C. Non-wetting characteristics
- D. High density Discuss
- 3. High alumina refractories are used in the
Options- A. dome of blast furnace stoves.
- B. electric arc furnace roof.
- C. glass melting furnaces.
- D. all (a), (b) and (c). Discuss
- 4. Spalling of a refractory means its
Options- A. softening.
- B. fracture due to uneven expansion at high temperature.
- C. resistancce to compressive loads.
- D. resistance to chemical action of gases and molten fluxes. Discuss
- 5. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.
Options- A. 50-100
- B. 100-150
- C. 200-400
- D. 500-1000 Discuss
- 6. Carbon refractories are exclusively used in the
Options- A. hearth of blast furnace.
- B. walls of coke oven.
- C. regenerators of coke oven.
- D. side wall of soaking pits. Discuss
- 7. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.
Options- A. 500
- B. 1000
- C. >1350
- D. >2000 Discuss
- 8. Which of the following is not a high alumina refractory material?
Options- A. Kyanite
- B. Sillimanite
- C. Diaspore
- D. Periclase Discuss
- 9. Porosity of fireclay refractories is __________ percent.
Options- A. 5-10
- B. 10-25
- C. 25-35
- D. 35-50 Discuss
- 10. Which one contains minimum percentage of SiO2?
Options- A. Firebrick
- B. Sillimanite
- C. Semi-silica
- D. Aluminous firebrick Discuss
Refractory Technology problems
Search Results
Correct Answer: acid
Correct Answer: Non-wetting characteristics
Correct Answer: all (a), (b) and (c).
Correct Answer: fracture due to uneven expansion at high temperature.
Correct Answer: 200-400
Correct Answer: hearth of blast furnace.
Correct Answer: >1350
Correct Answer: Periclase
Correct Answer: 10-25
Correct Answer: Sillimanite
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