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MCQs

Total Questions : 515 | Page 7 of 52 pages
Question 61. Permeability of bricks is a measure of the
  1.    refractoriness.
  2.    melting point.
  3.    rate at which a fluid will pass through the pores.
  4.    expansion during heating.
 Discuss Question
Answer: Option C. -> rate at which a fluid will pass through the pores.
Answer: (c).rate at which a fluid will pass through the pores.
Question 62. Fusion temperature of pure silica (SiO₂) is __________ °C.
  1.    1350
  2.    1715
  3.    2570
  4.    2800
 Discuss Question
Answer: Option B. -> 1715
Answer: (b).1715
Question 63. With increase in the density of silica refractories, its
  1.    resistance to slag attack increases.
  2.    spalling resistance reduces.
  3.    both (a) and (b).
  4.    neither (a) nor (b).
 Discuss Question
Answer: Option C. -> both (a) and (b).
Answer: (c).both (a) and (b).
Question 64. Addition of zircon to silica refractory brick improves its
  1.    crushing strength
  2.    resistance to slag attack
  3.    both (a) and (b)
  4.    neither (a) nor (b)
 Discuss Question
Answer: Option B. -> resistance to slag attack
Answer: (b).resistance to slag attack
Question 65. Which is a neutral refractory ?
  1.    Graphite
  2.    Magnesite chrome
  3.    Silica
  4.    Magnesia
 Discuss Question
Answer: Option A. -> Graphite
Answer: (a).Graphite
Question 66. Magnesite bricks have poor resistance to attack by __________ slag.
  1.    lime
  2.    basic
  3.    acid
  4.    none of these
 Discuss Question
Answer: Option C. -> acid
Answer: (c).acid
Question 67. Ganister is a source of the
  1.    silica
  2.    periclase
  3.    lime
  4.    none of these
 Discuss Question
Answer: Option A. -> silica
Answer: (a).silica
Question 68. Which is the stable form of silica upto 1470°C ?
  1.    Quartz
  2.    Cristobalite
  3.    Tridymite
  4.    None of these
 Discuss Question
Answer: Option C. -> Tridymite
Answer: (c).Tridymite
Question 69. An ideal refractory should have high
  1.    spalling rate
  2.    fusion point
  3.    shrinkage ability
  4.    none of these
 Discuss Question
Answer: Option B. -> fusion point
Answer: (b).fusion point
Question 70. Which brick undergoes maximum shrinkage on drying ?
  1.    Tar bonded dolomite bricks
  2.    Fireclay bricks
  3.    Magnesite bricks
  4.    Chromite bricks
 Discuss Question
Answer: Option B. -> Fireclay bricks
Answer: (b).Fireclay bricks

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