Peierls-Nabarro Stress and Dislocation Width MCQ

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• Smaller relative atomic displacements are required for a motion of a narrow dislocation.
  ক

  True

  খ

  False
• A width of dislocation is dependent on temperature.
  ক

  True

  খ

  False
• Ionic solids have _____ dislocation width and _____ frictional stress.
  ক

  Wide, very small

  খ

  Wide, moderate

  গ

  Narrow, moderate

  ঘ

  Narrow, large
• BCC metals (transition metals) have _____ yield strength temperature sensitivity.
  ক

  No

  খ

  Small

  গ

  Large

  ঘ

  Moderate
• Covalent solids have ____ width dislocations.
  ক

  Wide

  খ

  Narrow

  গ

  Moderate

  ঘ

  Very narrow
• Which materials have wide dislocations?
  ক

  BCC metals

  খ

  FCC metals

  গ

  Ionic solids

  ঘ

  Covalent solids
• Identify the type of dislocation?
  ক

  Wide

  খ

  Narrow

  গ

  Screw

  ঘ

  Frank partial
• What is P-N stress for a dislocation of width 10b?
  ক

  0

  খ

  G

  গ

  G/400

  ঘ

  G/1027
• What is P-N stress for a dislocation of width 5b?
  ক

  0

  খ

  G

  গ

  G/400

  ঘ

  G/1014
• A dislocation of width 0, requires stress equal _____ to move.
  ক

  Negligible

  খ

  Infinity

  গ

  Shear modulus

  ঘ

  Very less
• What is expression for width of dislocation?
  ক

  w = a

  খ

  w = a/(1-v)

  গ

  w = a(1-v)

  ঘ

  w = a/(v-1)
• Which factor doesn’t affect P-N stress?
  ক

  Periodicity of atoms

  খ

  Dislocation width

  গ

  Crystal structure

  ঘ

  Applied stress