Discussion
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- Question
Pick out the wrong statement.
Options- A. Sand & coke is the main raw material for the manufacture of silicon carbide.
- B. Carbon refractories can not be used in the furnaces operating under reducing conditions.
- C. Mullite can be obtained by the heating of alusite, kyanite or silimanite.
- D. Silica occurs in nature in all cellular, amorphous or crystalline form.
- Correct Answer
- Carbon refractories can not be used in the furnaces operating under reducing conditions.
- 1. Silica bricks have low spalling resistance below 600°C, due to its
Options- A. very high thermal conductivity.
- B. high co-efficient of expansion upto this temperature.
- C. high thermal diffusivity.
- D. low refractoriness. Discuss
- 2. Which of the following bricks has the most close values of RUL and PCE?
Options- A. Silica bricks
- B. Fireclay bricks
- C. High alumina bricks
- D. Tar dolomite bricks Discuss
- 3. Chrome magnesite bricks are
Options- A. acidic in nature.
- B. neutral in nature.
- C. having higher RUL than silica bricks.
- D. made by mixing 30% chromite and 70% periclase. Discuss
- 4. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
Options- A. 1800
- B. 2200
- C. 2400
- D. 2700 Discuss
- 5. Carbon refractories have very high
Options- A. wetting characteristics
- B. refractoriness
- C. thermal conductivity
- D. both (b) and (c) Discuss
- 6. Carbon bricks are not used in the lining of the
Options- A. combustion chamber of blast furnace stoves.
- B. electric furnaces.
- C. highly chemical resistant equipments.
- D. blast furnace hearth. Discuss
- 7. Silica refractories are not used in
Options- A. coke oven walls.
- B. beehive coke ovens.
- C. dome and upper portion of B.F. stoves.
- D. open hearth furnace roof. Discuss
- 8. Which of the following has the lowest electrical resistivity?
Options- A. Graphite
- B. Fireclay
- C. Alumina
- D. Zircon Discuss
- 9. Segar cones are used for the determination of __________ of refractories.
Options- A. softening temperature
- B. spalling resistance
- C. electrical conductivity
- D. resistance to slag attack Discuss
- 10. Lower part of hot metal mixer are lined with __________ bricks.
Options- A. superduty fireclay
- B. high alumina
- C. silica
- D. carborundum Discuss
Refractory Technology problems
Search Results
Correct Answer: high co-efficient of expansion upto this temperature.
Correct Answer: Silica bricks
Correct Answer: having higher RUL than silica bricks.
Correct Answer: 2700
Correct Answer: both (b) and (c)
Correct Answer: combustion chamber of blast furnace stoves.
Correct Answer: beehive coke ovens.
Correct Answer: Graphite
Correct Answer: softening temperature
Correct Answer: carborundum
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