Discussion
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- Question
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
Options- A. washing action of metal.
- B. corrosion by layer of slag.
- C. both (a) & (b).
- D. neither (a) nor (b).
- Correct Answer
- washing action of metal.
- 1. The maximum linear expansion of silica bricks during firing is about __________ percent.
Options- A. 0.5
- B. 1
- C. 2
- D. 3.5 Discuss
- 2. Dilatometer is used for the determination of __________ of refractories.
Options- A. modulus of rupture
- B. permanent linear change
- C. resistance to CO attack
- D. RUL Discuss
- 3. Graphite or carbon refractories
Options- A. exihibit wetting characteristics.
- B. should be used in neutral or reducing atmosphere.
- C. exhibit high shrinkage on thermal treatment.
- D. are not resistant to corrosion by slag. Discuss
- 4. Mullite is chemically represented by
Options- A. Al2O3 . 2SiO2
- B. 3Al2O3 . 2SiO2
- C. Al2O3 . SiO2
- D. 2Al2O3 . 3SiO2 Discuss
- 5. Maximum apparent porosity of magnesite bricks is about __________ percent.
Options- A. 8
- B. 24
- C. 44
- D. 58 Discuss
- 6. Use of higher percentage of lime for bonding silica bricks, reduces their
Options- A. strength
- B. abrasion resistance
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 7. Semi-silica bricks compared to silica bricks have
Options- A. less fusion point.
- B. better spalling resistance.
- C. both (a) and (b).
- D. neither (a) not (b). Discuss
- 8. Rate of slag attack on refractories increases with rise in temperature due to the
Options- A. decreased viscosity of slag.
- B. increased thermal conductivity of brick.
- C. oxidising condition in the furnace.
- D. none of these. Discuss
- 9. Chrome magnesite brick is not used for lining the
Options- A. hearth of soaking pits.
- B. bottom hearth of reheating furnace.
- C. coke oven regenerator.
- D. burning zone of limestone rotary kilns. Discuss
- 10. To resist spalling tendency, a refractory should have
Options- A. greater diffusivity.
- B. low specific heat.
- C. low thermal co-efficient of expansion.
- D. all (a), (b) and (c). Discuss
Refractory Technology problems
Search Results
Correct Answer: 3.5
Correct Answer: permanent linear change
Correct Answer: should be used in neutral or reducing atmosphere.
Correct Answer: 3Al2O3 . 2SiO2
Correct Answer: 24
Correct Answer: both (a) & (b)
Correct Answer: both (a) and (b).
Correct Answer: decreased viscosity of slag.
Correct Answer: coke oven regenerator.
Correct Answer: all (a), (b) and (c).
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