Discussion
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- Question
Insulating refractories should have
Options- A. high porosity
- B. low thermal conductivity
- C. both (a) and (b)
- D. neither (a) not (b)
- Correct Answer
- low thermal conductivity
- 1. Ferromagnetic ceramic material is not used in the
Options- A. thermal insulation
- B. transformers
- C. magnetic switches
- D. television sets Discuss
- 2. 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
- 3. Basic bricks are not made of
Options- A. fireclay
- B. magnesite
- C. foresterite
- D. chromite Discuss
- 4. Periclase is
Options- A. crystalline form of MgO.
- B. MgCO3.
- C. ZrSO4.
- D. amorphous magnesite. Discuss
- 5. Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in
Options- A. pottery furnace
- B. glass melting furnace
- C. crucibles
- D. gas retorts Discuss
- 6. Cold crushing strength of a refractory does not depend upon its
Options- A. shape
- B. composition
- C. firing temperature
- D. texture Discuss
- 7. 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
- 8. Which one contains maximum percentage of Al2O3?
Options- A. Firebrick
- B. Sillimanite
- C. Magnesite
- D. Aluminous firebrick Discuss
- 9. 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
- 10. 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
Refractory Technology problems
Search Results
Correct Answer: thermal insulation
Correct Answer: all (a), (b) and (c)
Correct Answer: fireclay
Correct Answer: crystalline form of MgO.
Correct Answer: gas retorts
Correct Answer: shape
Correct Answer: 1730
Correct Answer: Sillimanite
Correct Answer: 14-20
Correct Answer: blast furnace
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