Discussion
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- Question
Refractory bricks having lower porosity have
Options- A. high insulating properties
- B. low heat capacity
- C. low thermal conductivity
- D. greater strength
- Correct Answer
- greater strength
- 1. 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
- 2. Which of the following impurities reduces the refractoriness of magnesite bricks?
Options- A. Al2O3
- B. CaO
- C. SiO2
- D. all (a), (b) & (c) Discuss
- 3. 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) Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
Options- A. preheating
- B. cooling
- C. burning
- D. all Discuss
- 9. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.
Options- A. 700
- B. 1000
- C. 1600
- D. 2000 Discuss
- 10. Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.
Options- A. silica
- B. fireclay
- C. magnesite
- D. zirconia Discuss
Refractory Technology problems
Search Results
Correct Answer: decreases with rise in service temperature.
Correct Answer: all (a), (b) & (c)
Correct Answer: resistance to slag attack
Correct Answer: Refractories used in muffle furnace should have low thermal conductivity.
Correct Answer: high resistance to thermal shock and creep.
Correct Answer: silica
Correct Answer: all (a), (b) and (c)
Correct Answer: burning
Correct Answer: 1600
Correct Answer: fireclay
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