Discussion
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- Question
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
Options- A. non-wetting characteristic.
- B. high thermal conductivity.
- C. high crushing strength.
- D. none of these.
- Correct Answer
- non-wetting characteristic.
- 1. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
Options- A. hearth of the blast furnace.
- B. nuclear reactors, missiles & space crafts.
- C. insulation of high temperature furnaces.
- D. roof of electric furnaces. Discuss
- 2. Magnesite refractories are used for the construction of those furnaces, which are
Options- A. not required to resist the corrosive action of basic slag.
- B. not subjected to fluctuation in temperature.
- C. used for raising & maintaining high temperature.
- D. both (b) and (c) Discuss
- 3. Refractories are dried in the
Options- A. rotary kilns
- B. tunnel kilns
- C. sun
- D. none of these Discuss
- 4. Outer combustion chamber of blast furnace stove is lined with __________ bricks.
Options- A. fireclay
- B. silica
- C. chrome magnesite
- D. zirconia Discuss
- 5. Which one expands on heating?
Options- A. Silica bricks
- B. Fireclay bricks
- C. Both (a) & (b)
- D. Neither (a) nor (b) Discuss
- 6. Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.
Options- A. high duty fireclay
- B. silica
- C. mullite
- D. carborundum Discuss
- 7. Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.
Options- A. 5
- B. 20
- C. 40
- D. 55 Discuss
- 8. A steel member used in the furnace construction to take the thrust of the brickwork is called
Options- A. buckstay
- B. breast wall
- C. armouring
- D. baffle Discuss
- 9. Grog
Options- A. contains both alumina and silica.
- B. iscrushed firebrick.
- C. is a non-plastic material.
- D. all (a), (b) and (c). Discuss
- 10. With increase in the alumina content, the refractoriness of high alumina refractories
Options- A. increases
- B. decreases
- C. remains same
- D. may increase or decrease Discuss
Refractory Technology problems
Search Results
Correct Answer: nuclear reactors, missiles & space crafts.
Correct Answer: both (b) and (c)
Correct Answer: tunnel kilns
Correct Answer: fireclay
Correct Answer: Silica bricks
Correct Answer: high duty fireclay
Correct Answer: 20
Correct Answer: buckstay
Correct Answer: all (a), (b) and (c).
Correct Answer: increases
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