Fatigue of Metals MCQ

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

• At higher temperature, if higher frequency of stress cycle is applied on the material, fracture will be ___________ and at lower frequency of stress, the fracture will be ___________
  ক

  intergranular, intergranular

  খ

  transgranular, transgranuler

  গ

  intergranular, transgranular

  ঘ

  transgranuler, intergranular
• The fatigue strength of the material ___________ as the grain decreases.
  ক

  increases

  খ

  decreases

  গ

  remains the same

  ঘ

  no relation
• At any given temperature, the creep will __________ with increasing mean stress.
  ক

  decrease

  খ

  increase

  গ

  remain the same

  ঘ

  no relation
• The fatigue strength of the metal ____________ with increasing temperature.
  ক

  increases

  খ

  decrease

  গ

  remains the same

  ঘ

  no relation
• As the temperature decreases, there is a sudden change in the fatigue limit of the material, similar to what has been observed in the ductile to brittle transition.
  ক

  True

  খ

  False
• The fretting is the process of ____________
  ক

  corrosion due to water

  খ

  relative motion between 2 metal causing the corrosion

  গ

  corrosion due to air

  ঘ

  fatigue due to excessive stress
• The stainless steel components are coated with _________ to control the fatigue corrosion.
  ক

  copper

  খ

  zinc

  গ

  aluminum

  ঘ

  gold
• The number of pits generated on the surface of the material under fatigue corrosion are ________ than the number of pits on the surface of the same sample when it is tested only under corrosion environment.
  ক

  more

  খ

  less

  গ

  equal

  ঘ

  no pattern
• Is it possible that the material which shows the fatigue limit in normal environment does not show any endurance limit in a corrosive environment.
  ক

  True

  খ

  False
• Which one of the following is only present in the corrosion fatigue?
  ক

  Crack on surface

  খ

  Pits on surface

  গ

  Striation marks

  ঘ

  Benchmarks
• The corrosion fatigue is defined as the _________
  ক

  chemical attack

  খ

  stress

  গ

  cycle stress

  ঘ

  chemical attack and cycle stress
• The fatigue strength of the metal strain aging due to interstitial atoms is shown by which of the following curve?
  ক

  A

  খ

  B

  গ

  C

  ঘ

  D
• The fatigue strength of the pure metal is shown by which of the following curve?
  ক

  A

  খ

  B

  গ

  C

  ঘ

  D
• The ratio of fatigue strength of the material in the transverse direction to longitudinal direction (of their extrusion) will be highest in ___________
  ক

  induction furnace melted sample

  খ

  arc melting furnace melted sample

  গ

  vacuum melting sample

  ঘ

  cupola furnace meted sample
• Which of the following structure has the best fatigue property?
  ক

  Pearlite

  খ

  Martensite

  গ

  Tempered martensite

  ঘ

  Bainite
• What is the relationship between the grain size and the fatigue strength for low stacking fault energy material?
  ক

  Fatigue strength is directly proportional to grain size

  খ

  Fatigue strength is inversely proportional to grain size

  গ

  Fatigue strength is directly proportional to the square of grain size

  ঘ

  Fatigue strength is inversely proportional to the square root of grain size
• The effect of grain size on the fatigue strength is predominant in material with high stacking fault energy while the effect of grain size is negligible in low stacking fault energy material.
  ক

  True

  খ

  False
• The material with higher stacking fault energy has higher fatigue strength whereas the material with lower stacking fault will have a lower fatigue limit.
  ক

  True

  খ

  False
• Which of the following microstructure of steel will have the lowest fatigue strength?
  ক

  Pearlite

  খ

  Globular

  গ

  Nodular

  ঘ

  Acicular
• What will be the fatigue ratio of a notched specimen to an un-notched sample?
  ক

  The un-notched sample will have higher fatigue ratio

  খ

  The notched specimen will have higher fatigue ratio

  গ

  Both will have the same fatigue ratio

  ঘ

  Cannot comment
• The ratio of fatigue limit to tensile limit is called _________
  ক

  notch sensitivity factor

  খ

  fatigue strength reduction factor

  গ

  fatigue ratio

  ঘ

  stress concentration factor
• The fatigue limit of the cast and wrought iron is around ___________ of tensile strength.
  ক

  50%

  খ

  90%

  গ

  10%

  ঘ

  1%
• The infrequent tensile stress ____________ the fatigue life, whereas the infrequent compressive load ____________ fatigue life.
  ক

  increases, increases

  খ

  Increases, decreases

  গ

  decrease, increases

  ঘ

  decreases, decreases
• A steel component was loaded at 300MPa for 500 cycles, then at 200 MPa it is run for 100 Cycle and rest of the life it is loaded 100 MPa. Find the total number of cycles the component has run before failing?
  ক

  1000

  খ

  750

  গ

  1350

  ঘ

  1500
• The minor’s rule states that ____________ where n1, n2 is the number of cycle at the given stress level and N1, N2 are total number of cycle to failure at the given stress level.
  ক

  n1/N1+n2/N2+n3/N3+………………..+nk/Nk=1

  খ

  N1+N2+N3+………………..+Nk=1

  গ

  n1+n2+n3+………………..+nk=1

  ঘ

  n1/N1+n2/N2+n3/N3+………………..+nk/Nk=0
• The Minor’s rule is used to calculate the ____________
  ক

  cumulative fatigue life

  খ

  endurance limit

  গ

  number of cycles to failure

  ঘ

  stress ratio
• The fatigue failure of the material is cumulative property.
  ক

  True

  খ

  False
• The electroplating always has a positive effect on fatigue properties.
  ক

  True

  খ

  False
• Which of the following material shows a strong coaxing effect?
  ক

  Brass

  খ

  Aluminum

  গ

  Low-alloy steel

  ঘ

  Mild steel
• If the sample is tested for a large number of cycles below its fatigue limit and the stress is gradually increased above the fatigue limit, the true fatigue limit of material will _______
  ক

  improve

  খ

  worsen

  গ

  no effect

  ঘ

  cannot say