Discussion
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- Question
Which is required in an insulating refractory?
Options- A. High thermal conductivity
- B. Low porosity
- C. Both (a) and (b)
- D. Neither (a) nor (b)
- Correct Answer
- Neither (a) nor (b)
- 1. Which is not an alumino-silicate refractory?
Options- A. Fireclay bricks.
- B. Mullite bricks.
- C. Tar dolomite bricks.
- D. High alumina bricks. Discuss
- 2. With increase in the alumina content in firebricks, its fusion point (refractoriness)
Options- A. decreases linearly
- B. remains unchanged
- C. increases
- D. decreases Discuss
- 3. Silica refractories
Options- A. crack when subjected to sudden change of temperature.
- B. can not be used in the dome of hot blast stoves.
- C. have lower thermal conductivity than fireclay bricks.
- D. all (a), (b) and (c) Discuss
- 4. Which of the following is not a neutral refractory?
Options- A. Silicon carbide
- B. Magnesite
- C. Chromite
- D. Graphite Discuss
- 5. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 .
Options- A. 450
- B. 250
- C. 150
- D. 65 Discuss
- 6. __________ nozzles are used in continuous casting of steel,
Options- A. Zircon
- B. Thoria
- C. Carborundum
- D. Beryllia Discuss
- 7. 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
- 8. Which is the most stable crystalline form of silica at room temperature?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. None of these Discuss
- 9. Which of the following is not an acidic refractory?
Options- A. Silica bricks
- B. Fireclay bricks
- C. Bauxite bricks
- D. Magnesia bricks Discuss
- 10. 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
Refractory Technology problems
Search Results
Correct Answer: Tar dolomite bricks.
Correct Answer: increases
Correct Answer: crack when subjected to sudden change of temperature.
Correct Answer: Magnesite
Correct Answer: 65
Correct Answer: Zircon
Correct Answer: graphite
Correct Answer: Quartz
Correct Answer: Magnesia bricks
Correct Answer: low co-efficient of thermal expansion.
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