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Total Questions : 515 | Page 49 of 52 pages
Question 481. Which property of refractories is the most important for top section of the blast furnace?
  1.    Resistance to abrasion.
  2.    Resistance to slag peneration.
  3.    Stability of volume at high temperature.
  4.    Resistance to corrosion by slag.
 Discuss Question
Answer: Option A. -> Resistance to abrasion.
Answer: (a).Resistance to abrasion.
Question 482. Outer combustion chamber of blast furnace stove is lined with __________ bricks.
  1.    fireclay
  2.    silica
  3.    chrome magnesite
  4.    zirconia
 Discuss Question
Answer: Option A. -> fireclay
Answer: (a).fireclay
Question 483. Refractoriness/fusion points of 'superduty' refractories is __________ °C.
  1.    1520-1630
  2.    1630-1670
  3.    > 1730
  4.    > 2000
 Discuss Question
Answer: Option C. -> > 1730
Answer: (c).> 1730
Question 484. Presence of MgO in alumino-silicate refractories __________ its refractoriness.
  1.    increases
  2.    lowers
  3.    does not affect
  4.    either (a) or (b); depends on its quantity
 Discuss Question
Answer: Option B. -> lowers
Answer: (b).lowers
Question 485. Which one expands on heating ?
  1.    Silica bricks
  2.    Fireclay bricks
  3.    Both (a) & (b)
  4.    Neither (a) nor (b)
 Discuss Question
Answer: Option A. -> Silica bricks
Answer: (a).Silica bricks
Question 486. Thermosplastic materials
  1.    do not soften on application of heat.
  2.    are heavily branched molecules.
  3.    are solvent insoluble.
  4.    none of these.
 Discuss Question
Answer: Option D. -> none of these.
Answer: (d).none of these.
Question 487. In nylon-6, the number 6 represents the total number of
  1.    carbon atoms in the ring.
  2.    carbon atoms in the linear polymer chain.
  3.    nitrogen atoms in the ring.
  4.    hydrogen atoms in the ring.
 Discuss Question
Answer: Option B. -> carbon atoms in the linear polymer chain.
Answer: (b).carbon atoms in the linear polymer chain.
Question 488. Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is
  1.    7 kgf/cm² and 70 °C.
  2.    1000 kgf/cm² and 100°C.
  3.    7 kgf/cm² and 700°C.
  4.    1 kgf/cm² (gage) and 70°C.
 Discuss Question
Answer: Option A. -> 7 kgf/cm² and 70 °C.
Answer: (a).7 kgf/cm² and 70 °C.
Question 489. Vulcanisation of rubber does not increase its
  1.    elasticity
  2.    plasticity
  3.    ductility
  4.    none of these
 Discuss Question
Answer: Option B. -> plasticity
Answer: (b).plasticity
Question 490. Polyvinyl acetate is never used for making
  1.    moulded articles
  2.    fibres
  3.    adhesives
  4.    all (a), (b) & (c)
 Discuss Question
Answer: Option A. -> moulded articles
Answer: (a).moulded articles

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