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- Question
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)
- Correct Answer
- all (a), (b) and (c)
- 1. 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
- 2. Refractory bricks having lower porosity have
Options- A. high insulating properties
- B. low heat capacity
- C. low thermal conductivity
- D. greater strength Discuss
- 3. 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
- 4. Which of the following impurities reduces the refractoriness of magnesite bricks?
Options- A. Al2O3
- B. CaO
- C. SiO2
- D. all (a), (b) & (c) Discuss
- 5. 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
- 6. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
Options- A. preheating
- B. cooling
- C. burning
- D. all Discuss
- 7. 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
- 8. 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
- 9. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
Options- A. fireclay
- B. silicon carbide
- C. corrundum
- D. siliceous fireclay Discuss
- 10. Pick out the wrong statement.
Options- A. Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks.
- B. Graphite refractories are also called plumbago refractories.
- C. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
- D. Calcined magnesite is also called dead burnt magnesite. Discuss
Refractory Technology problems
Search Results
Correct Answer: silica
Correct Answer: greater strength
Correct Answer: decreases with rise in service temperature.
Correct Answer: all (a), (b) & (c)
Correct Answer: resistance to slag attack
Correct Answer: burning
Correct Answer: 1600
Correct Answer: fireclay
Correct Answer: silicon carbide
Correct Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
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