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MCQs

Total Questions : 868 | Page 2 of 87 pages
Question 11. Hot face insulating linings of high purity alumina fused mullite are used, where
  1.    Very high temperatures are involved
  2.    Highly reducing conditions are involved
  3.    Presence of iron or silica is harmful
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 12. With increase in the alumina content in firebricks, its fusion point (refractoriness)
  1.    Decreases linearly
  2.    Remains unchanged
  3.    Increases
  4.    Decreases
 Discuss Question
Answer: Option C. -> Increases
Question 13. Which is required in an insulating refractory?
  1.    High thermal conductivity
  2.    Low porosity
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option D. -> Neither A nor B
Question 14. Roof of a basic electric furnace is made of __________ bricks.
  1.    Superduty fireclay
  2.    Silica
  3.    Chromite
  4.    None of these
 Discuss Question
Answer: Option B. -> Silica
Question 15. Mixing of ground refractory material and water is done in a __________ mill.
  1.    Pug
  2.    Ball
  3.    Tube
  4.    Rod
 Discuss Question
Answer: Option A. -> Pug
Question 16. Which of the following is not a neutral refractory?
  1.    Silicon carbide
  2.    Magnesite
  3.    Chromite
  4.    Graphite
 Discuss Question
Answer: Option B. -> Magnesite
Question 17. Which is not an acidic refractory?
  1.    Silica
  2.    Fireclay
  3.    High alumina refractory
  4.    Carbon black
 Discuss Question
Answer: Option D. -> Carbon black
Question 18. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
  1.    Segar cones
  2.    Muffles for muffle furnaces
  3.    Insulating bricks
  4.    Crucibles used for melting of high purity metals
 Discuss Question
Answer: Option D. -> Crucibles used for melting of high purity metals
Question 19. 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
Question 20. Hot metal runner in blast furnace are lined with __________ bricks.
  1.    Silica
  2.    Carborundum
  3.    Fireclay
  4.    Magnesite
 Discuss Question
Answer: Option C. -> Fireclay

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