Discussion
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- Question
Ganister is a source of the
Options- A. silica
- B. periclase
- C. lime
- D. none of these
- Correct Answer
- silica
- 1. Magnesite chrome bricks are used in the
Options- A. roof lining of basic open hearth & other basic furnaces.
- B. reheating furnaces.
- C. soaking pits.
- D. all (a), (b) and (c). Discuss
- 2. Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
Options- A. oxidising
- B. neutral
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
- 3. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
Options- A. 10
- B. 15
- C. 20
- D. 30 Discuss
- 4. Porosity is induced in insulating refractories by adding
Options- A. powdered naphthalene.
- B. ammonium chloride/sulphate.
- C. calcium phosphate.
- D. all (a), (b) and (c). Discuss
- 5. The largest consumer of refractories is the __________ industry.
Options- A. cement
- B. metallurgical
- C. fertiliser
- D. power Discuss
- 6. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.
Options- A. 50-100
- B. 100-150
- C. 200-400
- D. 500-1000 Discuss
- 7. Spalling of a refractory means its
Options- A. softening.
- B. fracture due to uneven expansion at high temperature.
- C. resistancce to compressive loads.
- D. resistance to chemical action of gases and molten fluxes. Discuss
- 8. High alumina refractories are used in the
Options- A. dome of blast furnace stoves.
- B. electric arc furnace roof.
- C. glass melting furnaces.
- D. all (a), (b) and (c). Discuss
- 9. __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
Options- A. High thermal conductivity
- B. Low porosity
- C. Non-wetting characteristics
- D. High density Discuss
- 10. Magnesite bricks have poor resistance to attack by __________ slag.
Options- A. lime
- B. basic
- C. acid
- D. none of these Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: either (a) or (b)
Correct Answer: 30
Correct Answer: all (a), (b) and (c).
Correct Answer: metallurgical
Correct Answer: 200-400
Correct Answer: fracture due to uneven expansion at high temperature.
Correct Answer: all (a), (b) and (c).
Correct Answer: Non-wetting characteristics
Correct Answer: acid
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