Diffusion in Ternary Alloys MCQ

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• According to the model based on atomic mobility (as suggested by Darken in the year 1950), if a system has 3 mobilities then the number of independent coefficients is given by_____
  ক

  6

  খ

  5

  গ

  3

  ঘ

  2
• If a system has 3 components, the number of independent coefficients present if we utilize the ORR is given by____________
  ক

  3

  খ

  6

  গ

  2

  ঘ

  4
• What was the new feature introduced in the study of diffusion by Onsager?
  ক

  Barrel effect

  খ

  Cross effect

  গ

  Multi phase effect

  ঘ

  Side effect
• In order to describe the transport process in a ternary diffusion system, we need 4 inter-diffusion coefficients. Why?
  ক

  Doppler principle

  খ

  Catherine cross diagonal

  গ

  Linear extension of ficks law

  ঘ

  Shear pressure
• Who made the extension of Fick’s law to multicomponent system in the year 1945?
  ক

  Onsager

  খ

  Kirkland

  গ

  Brown

  ঘ

  Raoult
• Which of the following relate the flux of one component to the composition gradient of the other independent constituent in ternary system?
  ক

  Off-diagonal

  খ

  Side-diagonal

  গ

  Triangle rule

  ঘ

  Fick’s law
• In ternary alloy systems, because of the additional degree of freedom in the composition we may see composition profile which do not change monotonically through solid solution ranges and stable non- planar phase interfaces.
  ক

  True

  খ

  False
• Less striking effects can arise in ternary systems where all three components diffuse substitutionally if their diffusivities (or mobilities) are unequal.
  ক

  True

  খ

  False
• The inter-diffusion flux for a multicomponent system can be calculated using____
  ক

  Matano-Boltzmann analysis

  খ

  Henry’s laws

  গ

  Raoult’s Equation

  ঘ

  Perkins equation
• In Fe-Si-C alloys, why does carbon diffuse far more rapidly than the substitutionally dissolved silicon?
  ক

  Because it is large in size

  খ

  Because it has more mass

  গ

  Because it is an interstitial solute

  ঘ

  Because it is more volatile
• The addition of a third diffusing species to a solid solution produces some effects. Fe-Si-C alloys are particularly instructive for some reasons. Which among the following is a reason for the above-mentioned statement?
  ক

  Carbon raises the chemical potential of silicon

  খ

  Silicon raises the chemical potential of carbon

  গ

  Ferrous becomes inactive

  ঘ

  Mobility of carbon and silicon are almost same