Discussion
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- Question
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
- Correct Answer
- 1730
- 1. Cold crushing strength of a refractory does not depend upon its
Options- A. shape
- B. composition
- C. firing temperature
- D. texture Discuss
- 2. Insulating refractories should have
Options- A. high porosity
- B. low thermal conductivity
- C. both (a) and (b)
- D. neither (a) not (b) Discuss
- 3. Ferromagnetic ceramic material is not used in the
Options- A. thermal insulation
- B. transformers
- C. magnetic switches
- D. television sets Discuss
- 4. Chrome magnesite bricks are used in the
Options- A. side walls of soaking pits and arc furnaces.
- B. copper melting furnaces & converters.
- C. burner block of glass tanks.
- D. all (a), (b) and (c) Discuss
- 5. Basic bricks are not made of
Options- A. fireclay
- B. magnesite
- C. foresterite
- D. chromite Discuss
- 6. Which one contains maximum percentage of Al2O3?
Options- A. Firebrick
- B. Sillimanite
- C. Magnesite
- D. Aluminous firebrick Discuss
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. Fireclay bricks are never used in the
Options- A. beehive oven
- B. coke oven walls
- C. zinc roaster
- D. lead blast furnace Discuss
Refractory Technology problems
Search Results
Correct Answer: shape
Correct Answer: low thermal conductivity
Correct Answer: thermal insulation
Correct Answer: all (a), (b) and (c)
Correct Answer: fireclay
Correct Answer: Sillimanite
Correct Answer: 14-20
Correct Answer: blast furnace
Correct Answer: water
Correct Answer: coke oven walls
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