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- Question
Addition of zircon to silica refractory brick improves its
Options- A. crushing strength
- B. resistance to slag attack
- C. both (a) and (b)
- D. neither (a) nor (b)
- Correct Answer
- resistance to slag attack
- 1. 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
- 2. 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
- 3. 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
- 4. __________ 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
- 5. 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
- 6. Which of the following impurities reduces the refractoriness of magnesite bricks?
Options- A. Al2O3
- B. CaO
- C. SiO2
- D. all (a), (b) & (c) Discuss
- 7. Crushing strength of a refractory
Options- A. increases with rise in service temperature.
- B. decreases with rise in service temperature.
- C. is unaffected with change in service temperature.
- D. decreases with increase in porosity. Discuss
- 8. Refractory bricks having lower porosity have
Options- A. high insulating properties
- B. low heat capacity
- C. low thermal conductivity
- D. greater strength Discuss
- 9. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
Options- A. fireclay
- B. silica
- C. dolomite
- D. very low alumina Discuss
- 10. Fireclay refractories
Options- A. are not resistant to the action of basic slags.
- B. combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc.
- C. shrink during firing
- D. all (a), (b) and (c) Discuss
Refractory Technology problems
Search Results
Correct Answer: Refractories used in muffle furnace should have low thermal conductivity.
Correct Answer: high resistance to thermal shock and creep.
Correct Answer: spalling resistance
Correct Answer: RUL
Correct Answer: both (a) & (b).
Correct Answer: all (a), (b) & (c)
Correct Answer: decreases with rise in service temperature.
Correct Answer: greater strength
Correct Answer: silica
Correct Answer: all (a), (b) and (c)
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