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MCQs

Total Questions : 868 | Page 3 of 87 pages
Question 21. Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.
  1.    Silica
  2.    Fireclay
  3.    Magnesite
  4.    Zirconia
 Discuss Question
Answer: Option B. -> Fireclay
Question 22. Roof of a basic open hearth furnace is lined with __________ bricks.
  1.    Silica
  2.    Fireclay
  3.    Dolomite
  4.    Magnesite
 Discuss Question
Answer: Option A. -> Silica
Question 23. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
  1.    Bakelite impregnated or fused periclase
  2.    Silica
  3.    Semi-silica
  4.    Fireclay
 Discuss Question
Answer: Option A. -> Bakelite impregnated or fused periclase
Question 24. Bauxite calcining rotary kilns are lined with __________ bricks.
  1.    Fireclay
  2.    Carbon
  3.    85% alumina
  4.    Corundum
 Discuss Question
Answer: Option C. -> 85% alumina
Question 25. Lower part of hot metal mixer are lined with __________ bricks.
  1.    Superduty fireclay
  2.    High alumina
  3.    Silica
  4.    Carborundum
 Discuss Question
Answer: Option D. -> Carborundum
Question 26. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
  1.    Fireclay
  2.    Carborundum
  3.    Graphite
  4.    Chromite
 Discuss Question
Answer: Option C. -> Graphite
Question 27. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
  1.    Preheating
  2.    Cooling
  3.    Burning
  4.    All of the above
 Discuss Question
Answer: Option C. -> Burning
Question 28. __________ is not a single oxiderefractory.
  1.    Zirconia
  2.    Silicon carbide
  3.    Magnesia
  4.    None of these
 Discuss Question
Answer: Option B. -> Silicon carbide
Question 29. 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
Question 30. Which one contains maximum percentage of Al2O₃ ?
  1.    Firebrick
  2.    Sillimanite
  3.    Magnesite
  4.    Aluminous firebrick
 Discuss Question
Answer: Option B. -> Sillimanite

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