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MCQs

Total Questions : 68 | Page 3 of 7 pages
Question 21. What is the SI unit for the stress of a material?
  1.    N
  2.    N m
  3.    N m⁻¹
  4.    N m⁻²
 Discuss Question
Answer: Option D. -> N m⁻²
Answer: (d).N m⁻²
Question 22. The process of increasing strength of a material by changing grain size known as __________
  1.    Grain boundary strengthening
  2.    Work hardening
  3.    Solid solution hardening
  4.    Precipitation hardening
 Discuss Question
Answer: Option A. -> Grain boundary strengthening
Answer: (a).Grain boundary strengthening
Question 23. What is the value of Boltzmann’s constant?
  1.    8.314
  2.    1.38 * 10⁻²³
  3.    1.38
  4.    8.314 * 10⁻²³
 Discuss Question
Answer: Option B. -> 1.38 * 10⁻²³
Answer: (b).1.38 * 10⁻²³
Question 24. What is the slip plane for an FCC crystal?
  1.    {110}
  2.    {111}
  3.    {112}
  4.    {123}
 Discuss Question
Answer: Option B. -> {111}
Answer: (b).{111}
Question 25. At what value of the index of strain rate sensitivity does the material behave superplastically?
  1.    0
  2.    0.2
  3.    0.4 – 0.9
  4.    1.0 – 1.2
 Discuss Question
Answer: Option C. -> 0.4 – 0.9
Answer: (c).0.4 – 0.9
Question 26. How many slip systems are present in a NaCl crystal?
  1.    3
  2.    6
  3.    12
  4.    18
 Discuss Question
Answer: Option B. -> 6
Answer: (b).6
Question 27. What is the Hall-Petch constant for Iron?
  1.    0.068
  2.    0.11
  3.    0.71
  4.    1.77
 Discuss Question
Answer: Option C. -> 0.71
Answer: (c).0.71
Question 28. According to ________ five independent systems are required to maintain the reliability of grain boundaries.
  1.    Hal-Petch principle
  2.    Mohr-Coulomb theory
  3.    Tresca criterion
  4.    Von Mises criterion
 Discuss Question
Answer: Option D. -> Von Mises criterion
Answer: (d).Von Mises criterion
Question 29. Creep occurs at a temperature above ________
  1.    0.16 Tₘ
  2.    0.22 Tₘ
  3.    0.4 Tₘ
  4.    0.91 Tₘ
 Discuss Question
Answer: Option C. -> 0.4 Tₘ
Answer: (c).0.4 Tₘ
Question 30. What is the CRSS value of a copper crystal?
  1.    0.5
  2.    0.75
  3.    5
  4.    15
 Discuss Question
Answer: Option A. -> 0.5
Answer: (a).0.5

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