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MCQs

Total Questions : 46 | Page 4 of 5 pages
Question 31. At what temperature does eutectoid reaction occur?
  1.    418°C
  2.    666°C
  3.    723°C
  4.    928°C
 Discuss Question
Answer: Option C. -> 723°C
Answer: (c).723°C
Question 32. Steels containing 0.8% C are called ________
  1.    Eutectoid
  2.    Hypoeutectoid
  3.    Hypereutectoid
  4.    Mild eutectoid
 Discuss Question
Answer: Option A. -> Eutectoid
Answer: (a).Eutectoid
Question 33. Eutectoid steel is heated at __________
  1.    150°C
  2.    450°C
  3.    750°C
  4.    950°C
 Discuss Question
Answer: Option C. -> 750°C
Answer: (c).750°C
Question 34. How much carbon does hypoeutectoid steel contain?
  1.    <0.8%
  2.    0.8%
  3.    >0.8%
  4.    8%
 Discuss Question
Answer: Option A. -> <0.8%
Answer: (a).<0.8%
Question 35. Composition up to 0.008% carbon is considered as _________
  1.    Pure iron
  2.    Steel
  3.    Cast iron
  4.    Annealed steel
 Discuss Question
Answer: Option A. -> Pure iron
Answer: (a).Pure iron
Question 36. Which microconstituent of iron-carbon alloys does this figure demonstrate?Which Microconstituent Of Iron-carbon Alloys Does This Figur...
  1.    Pearlite
  2.    Bainite
  3.    Ledeburite
  4.    Martensite
 Discuss Question
Answer: Option A. -> Pearlite
Answer: (a).Pearlite
Question 37. Which reaction does this equation denote?
Solid 1 + Solid 2 →Solid 3
  1.    Eutectic
  2.    Peritectic
  3.    Eutectoid
  4.    Peritectoid
 Discuss Question
Answer: Option D. -> Peritectoid
Answer: (d).Peritectoid
Question 38. The existence of two or more crystal structures for any substance, depending on temperature, is known as _________
  1.    Allotropy
  2.    Solidification
  3.    Solubility
  4.    Interstices
 Discuss Question
Answer: Option A. -> Allotropy
Answer: (a).Allotropy
Question 39. Alloys containing 2.0-6.7% carbon are considered as __________
  1.    Steel
  2.    Cast-iron
  3.    Aluminum
  4.    Brass
 Discuss Question
Answer: Option B. -> Cast-iron
Answer: (b).Cast-iron
Question 40. What is the crystal structure of ϒ iron?
  1.    Body-centered cubic
  2.    Face-centered cubic
  3.    Hexagonal closely packed
  4.    Body-centered tetrahedral
 Discuss Question
Answer: Option B. -> Face-centered cubic
Answer: (b).Face-centered cubic

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