Metallographic Aspect of Fracture MCQ

Test your knowledge with important Metallographic Aspect of Fracture MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Metallographic Aspect of Fracture MCQs at Bissoy

• The Ductile fracture depends strongly on strain rate compared with brittle fracture, which is relatively insensitive to strain rate.
  ক

  True

  খ

  False
• The presence of notch in material will _______________ the ductile to brittle transition temperature of the material.
  ক

  increase

  খ

  decrease

  গ

  remain constant

  ঘ

  not dependent on notch
• In the flow curve equation given below, if the value of strain hardening exponent is increased, what will be the effect on the ductility of material? σ=Kεn; Where n is strain hardening exponent.
  ক

  It increases

  খ

  It decreases

  গ

  It remains constant

  ঘ

  Not dependent on n
• The presence of second phase particle reduces the ductility of the material. The type of particle which has the least effect in lowering the ductility is __________
  ক

  spherical precipitates

  খ

  platelike precipitates

  গ

  rodlike precipitates

  ঘ

  acicular precipitates
• The ductility of true strain values _____________ with increase in second phase particles.
  ক

  increases

  খ

  decrease

  গ

  remains constant

  ঘ

  no relationship
• The preferred sites for void formation are inclusions, second-phase particles, or the fine oxide particles, while in pure metals it is grain-boundary triple points.
  ক

  True

  খ

  False
• The main cause of presence of dimple in ductile fracture surface is ___________
  ক

  slip bands

  খ

  impurity atoms

  গ

  micro voids

  ঘ

  corrosion
• The crack growth in ductile material is by method of ______________
  ক

  shearing

  খ

  void coalescence

  গ

  dislocation movement

  ঘ

  impurity segregation
• The formation of necking produces the state of _________________
  ক

  triaxle stress

  খ

  biaxial stress

  গ

  uniaxial stress

  ঘ

  pure shear stress
• The necking begins when the ___________
  ক

  true stress and engineering stress becomes equal

  খ

  true strain and engineering strain becomes equal

  গ

  the true strain becomes equal to the strain hardening coefficient

  ঘ

  strain hardening coefficient becomes equal to an engineering strain