Discussion
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- Question
Which is the stable form of silica upto 1470°C?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. None of these
- Correct Answer
- Tridymite
- 1. Colour of fireclay bricks is
Options- A. light buff to reddish buff
- B. yellow
- C. black
- D. none of these Discuss
- 2. Spalling tendency of refractories is reduced by increasing its
Options- A. porosity
- B. specific gravity
- C. thermal conductivity
- D. strength Discuss
- 3. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?
Options- A. High refractoriness.
- B. High resistance to spalling.
- C. High strength and density.
- D. All (a), (b) and (c). Discuss
- 4. Roof of a basic open hearth furnace is lined with __________ bricks.
Options- A. silica
- B. fireclay
- C. dolomite
- D. magnesite Discuss
- 5. Grog addition in fireclay during brick manufacture is done to
Options- A. reduce its shrinkage on heating.
- B. impart greater spalling resistance.
- C. enhance the strength of fired refractories.
- D. all (a), (b) and (c). Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Sillimanite is a __________ refractory.
Options- A. basic
- B. neutral
- C. high alumina
- D. insulating Discuss
- 10. The main raw material for manufacture of silicon carbide refractories is
Options- A. corrundum
- B. carborundum
- C. bauxite
- D. periclase Discuss
Refractory Technology problems
Search Results
Correct Answer: light buff to reddish buff
Correct Answer: porosity
Correct Answer: High refractoriness.
Correct Answer: silica
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) and (c)
Correct Answer: specific gravity
Correct Answer: wear out lining of steel melting furnaces.
Correct Answer: high alumina
Correct Answer: carborundum
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