Discussion
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- Question
The main raw material for manufacture of silicon carbide refractories is
Options- A. corrundum
- B. carborundum
- C. bauxite
- D. periclase
- Correct Answer
- carborundum
- 1. Sillimanite is a __________ refractory.
Options- A. basic
- B. neutral
- C. high alumina
- D. insulating Discuss
- 2. Chrome magnesite is not used in the
Options- A. inner lining of L.D. converter.
- B. aluminium melting furnaces.
- C. wear out lining of steel melting furnaces.
- D. all (a), and (b) and (c) Discuss
- 3. Conversion of silica mineral to cristobalite is accompanied by reduction in its
Options- A. volume
- B. specific gravity
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 4. Tar dolomite bricks are used in the
Options- A. basic Bessemer converter
- B. basic open hearth furnace
- C. electric furnaces
- D. all (a), (b) and (c) Discuss
- 5. Which is the stable form of silica upto 1470°C?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. None of these Discuss
- 6. High refractorinness of refractory bricks means, that it has a
Options- A. high spalling resistance.
- B. low spalling resistance.
- C. high resistance to fusion.
- D. low porosity. Discuss
- 7. Which furnace consumes maximum refractory annually in an integrated steel plant?
Options- A. Soaking pit
- B. Blastfurnace
- C. L.D. converter
- D. Coke ovens Discuss
- 8. Carbon refractories have very high
Options- A. wetting characteristics
- B. refractoriness
- C. thermal conductivity
- D. both (b) and (c) Discuss
- 9. 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
- 10. 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
Refractory Technology problems
Search Results
Correct Answer: high alumina
Correct Answer: wear out lining of steel melting furnaces.
Correct Answer: specific gravity
Correct Answer: all (a), (b) and (c)
Correct Answer: Tridymite
Correct Answer: high resistance to fusion.
Correct Answer: L.D. converter
Correct Answer: both (b) and (c)
Correct Answer: 2700
Correct Answer: having higher RUL than silica bricks.
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