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MCQs

Total Questions : 868 | Page 5 of 87 pages
Question 41. Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.
  1.    1520
  2.    1630
  3.    1670
  4.    1730
 Discuss Question
Answer: Option D. -> 1730
Question 42. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
  1.    770
  2.    570
  3.    270
  4.    70
 Discuss Question
Answer: Option C. -> 270
Question 43. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
  1.    770
  2.    570
  3.    270
  4.    70
 Discuss Question
Answer: Option C. -> 270
Question 44. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
  1.    1520
  2.    1630
  3.    1670
  4.    1730
 Discuss Question
Answer: Option D. -> 1730
Question 45. 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
Question 46. __________ bricks should not be used in oxidising atmosphere.
  1.    Tar dolomite
  2.    Carbon
  3.    Silica
  4.    Fireclay
 Discuss Question
Answer: Option B. -> Carbon
Question 47. __________ bricks are used in the burning zone of a cement rotary kiln.
  1.    High alumina
  2.    Fireclay
  3.    Thoria
  4.    Silicon carbide
 Discuss Question
Answer: Option A. -> High alumina
Question 48. High thermal conductivity of a refractory material is not important, when it is to be used in the
  1.    Coke oven regenarators
  2.    Muffle furnace
  3.    Blast furnace
  4.    Recuperators
 Discuss Question
Answer: Option C. -> Blast furnace
Question 49. Thermal diffusivity of a refractory brick is high, when its __________ is high.
  1.    Density
  2.    Specific heat
  3.    Thermal conductivity
  4.    None of these
 Discuss Question
Answer: Option C. -> Thermal conductivity
Question 50. 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

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