Discussion
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- Question
Maximum apparent porosity of magnesite bricks is about __________ percent.
Options- A. 8
- B. 24
- C. 44
- D. 58
- Correct Answer
- 24
- 1. SiO2 percentage in firebrick is about
Options- A. 35-40
- B. 55-60
- C. 80-85
- D. >94 Discuss
- 2. Highest melting (m.p = 3070°C) oxide refractory is
Options- A. alumina
- B. thoria
- C. zirconia
- D. magnesia Discuss
- 3. An ideal refractory should have high
Options- A. spalling rate
- B. fusion point
- C. shrinkage ability
- D. none of these Discuss
- 4. With decrease in porosity, the __________ of the refractories decreases.
Options- A. strength
- B. thermal conductivity
- C. spalling resistance
- D. none of these Discuss
- 5. Zirconia refractories are not used in
Options- A. making sheaths for thermocouple.
- B. lining high temperature ceramic kilns.
- C. furnaces subjected to fluctuating temperature.
- D. high frequency induction furnaces in the form of inductors. Discuss
- 6. Mullite is chemically represented by
Options- A. Al2O3 . 2SiO2
- B. 3Al2O3 . 2SiO2
- C. Al2O3 . SiO2
- D. 2Al2O3 . 3SiO2 Discuss
- 7. 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
- 8. 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
- 9. The maximum linear expansion of silica bricks during firing is about __________ percent.
Options- A. 0.5
- B. 1
- C. 2
- D. 3.5 Discuss
- 10. 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). Discuss
Refractory Technology problems
Search Results
Correct Answer: 55-60
Correct Answer: thoria
Correct Answer: fusion point
Correct Answer: spalling resistance
Correct Answer: furnaces subjected to fluctuating temperature.
Correct Answer: 3Al2O3 . 2SiO2
Correct Answer: should be used in neutral or reducing atmosphere.
Correct Answer: permanent linear change
Correct Answer: 3.5
Correct Answer: washing action of metal.
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