Discussion
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- Question
High thermal conductivity of a refractory material is not important, when it is to be used in the
Options- A. coke oven regenarators
- B. muffle furnace
- C. blast furnace
- D. recuperators
- Correct Answer
- blast furnace
- 1. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
Options- A. 2-3
- B. 5-7
- C. 7-12
- D. 14-20 Discuss
- 2. Which one contains maximum percentage of Al2O3?
Options- A. Firebrick
- B. Sillimanite
- C. Magnesite
- D. Aluminous firebrick Discuss
- 3. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
Options- A. 1520
- B. 1630
- C. 1670
- D. 1730 Discuss
- 4. Cold crushing strength of a refractory does not depend upon its
Options- A. shape
- B. composition
- C. firing temperature
- D. texture Discuss
- 5. Insulating refractories should have
Options- A. high porosity
- B. low thermal conductivity
- C. both (a) and (b)
- D. neither (a) not (b) Discuss
- 6. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
Options- A. aluminium phosphate
- B. water
- C. lime
- D. plaster of paris Discuss
- 7. Fireclay bricks are never used in the
Options- A. beehive oven
- B. coke oven walls
- C. zinc roaster
- D. lead blast furnace Discuss
- 8. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ? 0.5 percent.
Options- A. fireclay
- B. silica
- C. magnesite
- D. corundum Discuss
- 9. Si percentage in silica refractories used in the walls of coke oven is about
Options- A. 45
- B. 60
- C. 80
- D. 95 Discuss
- 10. Refractoriness under load (RUL) is the most important property for the refractory bricks
Options- A. at the hearth bottom of the furnace on which stock is placed.
- B. used for furnace insulation.
- C. used in the roof of the furnace.
- D. none of these. Discuss
Refractory Technology problems
Search Results
Correct Answer: 14-20
Correct Answer: Sillimanite
Correct Answer: 1730
Correct Answer: shape
Correct Answer: low thermal conductivity
Correct Answer: water
Correct Answer: coke oven walls
Correct Answer: fireclay
Correct Answer: 95
Correct Answer: at the hearth bottom of the furnace on which stock is placed.
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