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MCQs

Total Questions : 46 | Page 3 of 5 pages
Question 21. ___________ is a eutectic mixture of α iron and Fe₃C.
  1.    Pearlite
  2.    Martensite
  3.    Ledeburite
  4.    Sorbite
 Discuss Question
Answer: Option C. -> Ledeburite
Answer: (c).Ledeburite
Question 22. What is the crystal structure of austenite upon heating?
  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
Question 23. What is the solubility of α ferrite at 0°C?
  1.    0.1%
  2.    0.02%
  3.    0.005%
  4.    0.0004%
 Discuss Question
Answer: Option C. -> 0.005%
Answer: (c).0.005%
Question 24. At what temperature does δ ferrite melt?
  1.    1674 F
  2.    1990 F
  3.    2541 F
  4.    2800 F
 Discuss Question
Answer: Option D. -> 2800 F
Answer: (d).2800 F
Question 25. The eutectic point in the iron-iron carbide phase diagram occurs at __________ weight % composition of carbon.
  1.    0.022
  2.    0.77
  3.    2.11
  4.    4.30
 Discuss Question
Answer: Option D. -> 4.30
Answer: (d).4.30
Question 26. How much iron does cementite contain?
  1.    6.67%
  2.    24.23%
  3.    73.4%
  4.    93.3%
 Discuss Question
Answer: Option D. -> 93.3%
Answer: (d).93.3%
Question 27. At what temperature does peritectic reaction occur?
  1.    1778°C
  2.    1495°C
  3.    1148°C
  4.    723°C
 Discuss Question
Answer: Option B. -> 1495°C
Answer: (b).1495°C
Question 28. What is the maximum solubility of carbon in austenite at 1148°C?
  1.    0.09%
  2.    0.8%
  3.    2.08%
  4.    14.35%
 Discuss Question
Answer: Option C. -> 2.08%
Answer: (c).2.08%
Question 29. Peritectic reactions are applicable for carbon contents up to _________
  1.    0.1%
  2.    0.26%
  3.    0.55%
  4.    0.96%
 Discuss Question
Answer: Option C. -> 0.55%
Answer: (c).0.55%
Question 30. How much austenite does eutectic reaction form?
  1.    4.3%
  2.    6.67%
  3.    11.28%
  4.    17.89%
 Discuss Question
Answer: Option A. -> 4.3%
Answer: (a).4.3%

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