Deformation by Twinning MCQ

Test your knowledge with important Deformation by Twinning MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Deformation by Twinning MCQs at Bissoy

• What is the resolved shear stress, when dislocation density in metal is equal to 1012m-2? Given that shear stress needed in the absence of dislocation is 500MPa. Numerical constant is 0.3 and shear modulus is 80GPa, burger vector is 1 nm.
  ক

  500MPa

  খ

  550MPa

  গ

  600 MPa

  ঘ

  524 MPa
• Strain hardening due to ___________ process arises from short range force occurring over a distance of 5 to 10 atomic distance. This hardening can be overcome at finite temperatures with the help of thermal fluctuations, and therefore, it is temperature and strain-rate-dependent.
  ক

  dislocation cutting

  খ

  dislocation pile-up

  গ

  second phase particle

  ঘ

  alloying
• The formation of jogs in screw dislocations _________ its motion. Jogs in edge dislocations _________ its motion.
  ক

  restricts, do not restricts

  খ

  do not restricts, restricts

  গ

  restricts, restricts

  ঘ

  do not restrict, do not restrict
• Cross slip can occur in both the edge dislocation as well as in screw dislocation.
  ক

  True

  খ

  False
• The interaction of dislocation does not result in ______________
  ক

  jog

  খ

  kink

  গ

  dislocation threading

  ঘ

  slip
• The dislocation of low mobility that is produced by a dislocation reaction is called a ______ dislocation.
  ক

  sessile

  খ

  glissile

  গ

  screw

  ঘ

  edge
• A zinc crystal is strained to point A, unloaded, and then reloaded in the direction opposite to the original slip direction: What is the reason for the drop in shear stress when loaded in the opposite direction?
  ক

  Back stress

  খ

  Strain hardening

  গ

  Increase in the number of slip system

  ঘ

  Slip plane reorientation
• Which of the following is not a source of dislocation multiplication?
  ক

  Condensation of the vacancy

  খ

  Frank read mechanism

  গ

  Emission from high angle grain boundary

  ঘ

  Annealing
• Inhomogeneous deformation of crystal results in regions of different orientation called deformation bands. Deformation bands have been observed in both fcc and bcc metals, but not in hcp metals.
  ক

  True

  খ

  False
• Among the given metal, which has the highest stacking fault energy?
  ক

  Aluminum

  খ

  Copper

  গ

  Brass

  ঘ

  Stainless steel
• Deformation by twinning is not a dominant mode of deformation in FCC metals.
  ক

  True

  খ

  False
• Annealing twins largely effect strain hardening properties.
  ক

  True

  খ

  False
• The stress-strain curve of single crystal undergoing twinning shows ____
  ক

  No irregularity

  খ

  Jagged irregularities

  গ

  Sudden drop in the curve

  ঘ

  Peaks
• What is associated with a cry of tin?
  ক

  Slip

  খ

  Thermal vibration

  গ

  Twinning

  ঘ

  Quenching
• The plane passing through the twinning axis and separating the region of twinning from undeformed part is called ___ planes.
  ক

  Twinning

  খ

  Slip

  গ

  Basal

  ঘ

  Close packed
• The extend of deformation due to mechanical twinning is ___ than due to slip.
  ক

  smaller

  খ

  larger

  গ

  equal

  ঘ

  smallest