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- Question
Which is not a high alumina refractory?
Options- A. Mullite
- B. Corrundum
- C. Bauxite
- D. Dolomite
- Correct Answer
- Dolomite
- 1. Silicon carbide refractories are used in the
Options- A. muffle furnace
- B. zinc smelting furnace
- C. ceramic recuperators
- D. all (a), (b) and (c) Discuss
- 2. Which is a basic refractory?
Options- A. Fireclay
- B. Silica
- C. Chrome magnesite
- D. None of these Discuss
- 3. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?
Options- A. Tar bonded dolomite bricks
- B. Fireclay bricks
- C. Mullite bricks
- D. Magnesite bricks Discuss
- 4. Cold crushing strength of refractories depends upon its
Options- A. composition
- B. texture
- C. firing temperature
- D. all (a), (b) and (c) Discuss
- 5. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
Options- A. 10
- B. 100
- C. 500
- D. 1000 Discuss
- 6. Ramming masses are used for
Options- A. obtaining monolithic working faces.
- B. repairing construction of various furnace parts.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 7. __________ is the measure of the strength of refractory under the combined effect of temperature & load.
Options- A. Porosity
- B. RUL
- C. Specific gravity
- D. Thermal conductivity Discuss
- 8. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
Options- A. spalling resistance
- B. refractoriness
- C. crushing strength
- D. resistance to slag Discuss
- 9. High alumina refractory compared to fireclay bricks have
Options- A. less load bearing capacity.
- B. less resistance to slag attack.
- C. low refractoriness.
- D. high resistance to thermal shock and creep. Discuss
- 10. Pick out the wrong statement.
Options- A. Refractories used in muffle furnace should have low thermal conductivity.
- B. The electrical resistivity of refractories drops rapidly with rise in temperature.
- C. For reducing spalling tendency, the refractory should be well fired and its porosity should be more.
- D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness. Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c)
Correct Answer: Chrome magnesite
Correct Answer: Tar bonded dolomite bricks
Correct Answer: all (a), (b) and (c)
Correct Answer: 1000
Correct Answer: both (a) & (b).
Correct Answer: RUL
Correct Answer: spalling resistance
Correct Answer: high resistance to thermal shock and creep.
Correct Answer: Refractories used in muffle furnace should have low thermal conductivity.
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