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  • Question

  • 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.

  • Correct Answer
  • should be used in neutral or reducing atmosphere. 

    • Refractory Technology problems

    Search Results

    • 1. Mullite is chemically represented by

    • Options
    • A. Al2O3 . 2SiO2
    • B. 3Al2O3 . 2SiO2
    • C. Al2O3 . SiO2
    • D. 2Al2O3 . 3SiO2
      • Discuss
    • 2. Maximum apparent porosity of magnesite bricks is about __________ percent.

    • Options
    • A. 8
    • B. 24
    • C. 44
    • D. 58
      • Discuss
    • 3. SiO2 percentage in firebrick is about

    • Options
    • A. 35-40
    • B. 55-60
    • C. 80-85
    • D. >94
      • Discuss
    • 4. Highest melting (m.p = 3070°C) oxide refractory is

    • Options
    • A. alumina
    • B. thoria
    • C. zirconia
    • D. magnesia
      • Discuss
    • 5. An ideal refractory should have high

    • Options
    • A. spalling rate
    • B. fusion point
    • C. shrinkage ability
    • D. none of these
      • Discuss
    • 6. 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
    • 7. The maximum linear expansion of silica bricks during firing is about __________ percent.

    • Options
    • A. 0.5
    • B. 1
    • C. 2
    • D. 3.5
      • Discuss
    • 8. 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
    • 9. 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
    • 10. 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

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