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MCQs

Total Questions : 515 | Page 8 of 52 pages
Question 71. Spalling of a refractory means its
  1.    softening.
  2.    fracture due to uneven expansion at high temperature.
  3.    resistancce to compressive loads.
  4.    resistance to chemical action of gases and molten fluxes.
 Discuss Question
Answer: Option B. -> fracture due to uneven expansion at high temperature.
Answer: (b).fracture due to uneven expansion at high temperature.
Question 72. Chrome magnesite brick is not used for lining the
  1.    hearth of soaking pits.
  2.    bottom hearth of reheating furnace.
  3.    coke oven regenerator.
  4.    burning zone of limestone rotary kilns.
 Discuss Question
Answer: Option C. -> coke oven regenerator.
Answer: (c).coke oven regenerator.
Question 73. Highest melting (m.p = 3070°C) oxide refractory is
  1.    alumina
  2.    thoria
  3.    zirconia
  4.    magnesia
 Discuss Question
Answer: Option B. -> thoria
Answer: (b).thoria
Question 74. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
  1.    spalling resistance.
  2.    fusion point.
  3.    resistance to slag penetration.
  4.    resistance to carbon monoxide attack.
 Discuss Question
Answer: Option B. -> fusion point.
Answer: (b).fusion point.
Question 75. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
  1.    washing action of metal.
  2.    corrosion by layer of slag.
  3.    both (a) & (b).
  4.    neither (a) nor (b).
 Discuss Question
Answer: Option A. -> washing action of metal.
Answer: (a).washing action of metal.
Question 76. Which one contains minimum percentage of SiO₂?
  1.    Firebrick
  2.    Sillimanite
  3.    Semi-silica
  4.    Aluminous firebrick
 Discuss Question
Answer: Option B. -> Sillimanite
Answer: (b).Sillimanite
Question 77. Porosity of silica bricks varies from __________ percent.
  1.    5 to 10
  2.    20 to 30
  3.    45 to 60
  4.    60 to 75
 Discuss Question
Answer: Option B. -> 20 to 30
Answer: (b).20 to 30
Question 78. Colour of fireclay bricks is
  1.    light buff to reddish buff
  2.    yellow
  3.    black
  4.    none of these
 Discuss Question
Answer: Option A. -> light buff to reddish buff
Answer: (a).light buff to reddish buff
Question 79. Which of the following is not a high alumina refractory material ?
  1.    Kyanite
  2.    Sillimanite
  3.    Diaspore
  4.    Periclase
 Discuss Question
Answer: Option D. -> Periclase
Answer: (d).Periclase
Question 80. Rate of slag attack on refractories increases with rise in temperature due to the
  1.    decreased viscosity of slag.
  2.    increased thermal conductivity of brick.
  3.    oxidising condition in the furnace.
  4.    none of these.
 Discuss Question
Answer: Option A. -> decreased viscosity of slag.
Answer: (a).decreased viscosity of slag.

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