Discussion
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- Question
'Super refractories' are made from pure
Options- A. carbides
- B. oxides
- C. borides
- D. nitrides
- Correct Answer
- oxides
- 1. Fireclay refractories have
Options- A. low co-efficient of thermal expansion.
- B. poor thermal spalling resistance.
- C. tendency to expand unduly high during firing.
- D. very high cost. Discuss
- 2. Which of the following is not an acidic refractory?
Options- A. Silica bricks
- B. Fireclay bricks
- C. Bauxite bricks
- D. Magnesia bricks Discuss
- 3. Which is the most stable crystalline form of silica at room temperature?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. None of these Discuss
- 4. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
Options- A. fireclay
- B. carborundum
- C. graphite
- D. chromite Discuss
- 5. __________ nozzles are used in continuous casting of steel,
Options- A. Zircon
- B. Thoria
- C. Carborundum
- D. Beryllia Discuss
- 6. Chromite refractories are
Options- A. acidic refractory.
- B. neutral refractory.
- C. basic refractory.
- D. fired at a temperature of 600°C only. Discuss
- 7. Spalling resistance of a refractory can not be increased by
Options- A. increasing its porosity.
- B. using a coarser grog during its manufacture.
- C. decreasing its thermal co-efficient of expansion.
- D. making it denser. Discuss
- 8. Alumina-graphite bricks are used for lining the
Options- A. slide gate in teeming laddies.
- B. continuous casting systems.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
- 9. Zirconia refractory
Options- A. does not react with basic slags.
- B. is produced from baddeleyite.
- C. can not be used as an insulator.
- D. has poor electrical conductivity at high temperature. Discuss
- 10. With increasing alumina content, the fusion point of high alumina refractories
Options- A. increases.
- B. decreases.
- C. remains constant.
- D. may increase or decrease ; depends on its alumina content. Discuss
Refractory Technology problems
Search Results
Correct Answer: low co-efficient of thermal expansion.
Correct Answer: Magnesia bricks
Correct Answer: Quartz
Correct Answer: graphite
Correct Answer: Zircon
Correct Answer: neutral refractory.
Correct Answer: making it denser.
Correct Answer: both (a) and (b).
Correct Answer: is produced from baddeleyite.
Correct Answer: increases.
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