Stress-Rupture Test MCQ

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• The metal undergoing creep operates under only one creep mechanism at a time.
  ক

  True

  খ

  False
• The chief mechanism responsible for Coble creep is _____________
  ক

  dislocation glide

  খ

  diffusional Creep

  গ

  dislocation creep

  ঘ

  grain boundary sliding
• The chief mechanism responsible for Nabarro-Herring creep is _____________
  ক

  dislocation glide

  খ

  dislocation creep

  গ

  diffusional creep

  ঘ

  grain boundary sliding
• The diffusional creep is the chief mechanism activated in the stress range of ___________
  ক

  σ/G > 10-2

  খ

  10 > σ/G > 10-2

  গ

  10-4 < σ/G < 10-2

  ঘ

  σ/G < 10-4
• The dislocation creep mechanism is active in the region ___________, where σ is applied stress and G is shear modulus.
  ক

  σ/G > 10-2

  খ

  10 > σ/G > 10-2

  গ

  10-4 < σ/G < 10-2

  ঘ

  σ/G < 10-4
• The dislocation glide is one of the mechanisms responsible for creep of the metals. Its condition for dislocation mechanism is _______________
  ক

  high stress

  খ

  low stress

  গ

  high temperature

  ঘ

  low temperature
• The total strain in the material is 47 %. Find the approximate percentage of strain which is caused by grain boundary sliding in total deformation?
  ক

  47%

  খ

  40%

  গ

  5%

  ঘ

  0.01%
• The grain boundary sliding is promoted by increasing ____________ and decreasing ___________
  ক

  temperature, strain rate

  খ

  strain rate, temperature

  গ

  temperature, stress

  ঘ

  stress, temperature
• The grain boundary sliding is a shear process occurring along the ________
  ক

  direction of the grain boundary

  খ

  perpendicular direction of the grain boundary

  গ

  outward plane of the grain boundary

  ঘ

  inward plane of the grain boundary
• The material with low stacking fault energy is prone to sub-grain formation compared to the metal with high stacking fault energy.
  ক

  True

  খ

  False
• The slip bands inside a grain during creep was first observed by which instrument?
  ক

  Scanning electron microscope

  খ

  Transmission electron microscope

  গ

  Phase-contrast microscopy

  ঘ

  X-ray diffraction
• The formation of sub-grain structure inside the lattice is a phenomena observed in the high-temperature creep. The number of new sub-grain formed are highest in which stage of creep?
  ক

  Primary

  খ

  Secondary

  গ

  Tertiary

  ঘ

  Equal in all phase
• The slip band produced at higher temperature are _______ and ________ spaced than for a room temperature deformation.
  ক

  fine, widely

  খ

  fine, narrow

  গ

  coarse, widely

  ঘ

  coarse, narrow
• The large-grained aluminum is most suitable for creep related study.
  ক

  True

  খ

  False
• The following graph represents the relation between the creep rate and the total strain:
  ক

  True

  খ

  False
• The change in the slope of stress-rupture line is not due to _____________
  ক

  metallurgical change

  খ

  necking of the material

  গ

  oxidation

  ঘ

  recrystallization
• Which curve in the following graph is correctly showing the relationship between the stress and rupture time of the material?
  ক

  A

  খ

  B

  গ

  C

  ঘ

  D
• The creep test and the stress-rupture test are the same things representing the same type of curve at equal stresses.
  ক

  True

  খ

  False
• Typically the creep rate is measured in which unit?
  ক

  Length/minutes

  খ

  Load/length

  গ

  Percentage change of length/hour

  ঘ

  Percentage change of length/percentage change of time