Diffusion in Multiphase Binary Systems MCQ

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• The shortest repeat-distance is aligned parallel to the direction of diffusion (fiber texture). This statement is known as____
  ক

  Perkin rule

  খ

  Thumb rule

  গ

  Henrys rule

  ঘ

  Marks direction principle
• If a single crystalline layer of γ is growing between single crystalline substrate α and β, one might expect a completely_____
  ক

  Straight α/γ and γ/β interfaces

  খ

  Curved α/γ and γ/β interfaces

  গ

  Straight γ/α and γ/β interfaces

  ঘ

  Curved γ/α and γ/β interfaces
• The direction of the longest crystallographic axis is invariably oriented __________
  ক

  Parallel to diffusion direction

  খ

  Perpendicular to interface

  গ

  Perpendicular to diffusion direction

  ঘ

  Cannot be predicted
• Accurate microbe analysis near the interfaces are very difficult if the fluorescent effect affects the concentration measurements at distance as large as 40*10-6m from the interface.
  ক

  True

  খ

  False
• The flux of atoms to the interface balance the________
  ক

  Rate of accumulation due to the boundary migration

  খ

  Mass of the system

  গ

  Volume of the system

  ঘ

  Stability of the grain boundary
• Under some circumstances the interface migration is said to be interface controlled.
  ক

  True

  খ

  False
• Which among the following can give an extra information on layer growth mechanism and concentration limit of various phases?
  ক

  Edges and free surface of diffusion couple

  খ

  Positions of dislocation

  গ

  Composition ratio

  ঘ

  Shape of the interface
• If the diffusion couple technique is not used in a proper way which of the following error is most likely to occur?
  ক

  The necessity to use the decremented couples

  খ

  Small roles played by impurities

  গ

  Steep concentration gradient may occur in the growing phases

  ঘ

  No errors are likely to occur
• Non equilibrium diffusion couples, a situation often encountered at ________
  ক

  High temperature

  খ

  Low temperature

  গ

  When nucleation is perfect

  ঘ

  Annealing time is too long
• Which of the following is an example of Diffusion in multi-phase binary system?
  ক

  Alcohol in water

  খ

  Aldehyde in water

  গ

  Ketone in water

  ঘ

  Galvanized iron and hot-dipped tin plate