Discussion
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- Question
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
Options- A. preheating
- B. cooling
- C. burning
- D. all
- Correct Answer
- burning
- 1. 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
- 2. 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
- 3. Refractory bricks having lower porosity have
Options- A. high insulating properties
- B. low heat capacity
- C. low thermal conductivity
- D. greater strength Discuss
- 4. 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
- 5. Which of the following impurities reduces the refractoriness of magnesite bricks?
Options- A. Al2O3
- B. CaO
- C. SiO2
- D. all (a), (b) & (c) Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. Dolomite bricks have good resistance to attack by
Options- A. molten steel
- B. iron oxide
- C. lime slag
- D. none of these Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c)
Correct Answer: silica
Correct Answer: greater strength
Correct Answer: decreases with rise in service temperature.
Correct Answer: all (a), (b) & (c)
Correct Answer: 1600
Correct Answer: fireclay
Correct Answer: silicon carbide
Correct Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
Correct Answer: molten steel
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