Surface Effect & Fatigue MCQ

Test your knowledge with important Surface Effect & Fatigue MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Surface Effect & Fatigue MCQs on Bissoy. Bissoy App

• In the given curve, the slope of the middle linear portion is equal to _________
  ক

  da/dN

  খ

  ΔK

  গ

  A

  ঘ

  p
• Increasing the mean stress ___________ the crack growth rate.
  ক

  increases

  খ

  decreases

  গ

  does not change

  ঘ

  no relationship
• The relationship between the stress intensity factor and crack growth is given as _______
  ক

  da/dN = A (ΔK)

  খ

  da/dN = A (ΔK)p

  গ

  da/dN = (ΔK)

  ঘ

  da/dN = A (1/ΔK)p
• The crack propagation rate with stress is given as ______ Where; -> da/dN is crack growth with each cycle -> C is constant -> σm is mean stress -> σa is alternating stress -> a is the crack length -> m and n are constant
  ক

  da/dN = C σam an

  খ

  da/dN = C σmm an

  গ

  da/dN = C σa a

  ঘ

  da/dN = σa a
• With decrease in the temperature, the fatigue strength of the material ___________
  ক

  decreases

  খ

  increases

  গ

  remains constant

  ঘ

  no relationship
• The plastic blunting process is the growth mechanism of crack, followed by the ___________
  ক

  first stage of crack growth

  খ

  second stage of the crack growth

  গ

  third stage of the crack growth

  ঘ

  termination of the crack
• The fatigue strain does not cause considerable strain hardening of successive cycle with growth of cracks.
  ক

  True

  খ

  False
• The fatigue crack propagation is _____________ in nature.
  ক

  intergranular

  খ

  transgranular

  গ

  along the high atomic density planes

  ঘ

  along the low-density atomic planes
• The number of slip band in the fatigue is directly proportional to the number of cycles.
  ক

  True

  খ

  False
• There is no evidence of the fatigue crack growth on the nanoscale level, or crystallographic direction does not play any role in deciding the fatigue behavior of any material.
  ক

  True

  খ

  False
• Which stage of the fatigue crack is most significant in the high cycle fatigue?
  ক

  Crack initiation

  খ

  Slip band crack growth

  গ

  Crack growth on the plane of high tensile stress

  ঘ

  Ultimate ductile failure
• Which stage of the fatigue crack is most significant in the low cycle fatigue?
  ক

  Crack initiation

  খ

  Slip band crack growth

  গ

  Crack growth on the plane of high tensile stress

  ঘ

  Ultimate ductile failure
• Generally, the fatigue crack initiation takes place in which stage of the life of the component?
  ক

  In the last stage – around 90% of life

  খ

  In the beginning of life – around 10%

  গ

  In the middle – around 50%

  ঘ

  Can occur in any stage
• The fatigue failure is divided into ______ major parts.
  ক

  four

  খ

  three

  গ

  two

  ঘ

  one
• The ductile material gives best result in the high strain amplitude or high cycle fatigue, while the strong material gives best result in high-stress low cycle fatigue.
  ক

  True

  খ

  False
• The equation of fatigue valid for entire range of fatigue life is given as _____________
  ক

  Δε/2=Δεe/2+Δεp/2

  খ

  Δε/2=Δεe/2+Δεp

  গ

  Δε/2=Δεe+Δεp/2

  ঘ

  Δε=Δεe/2+Δεp/2
• Smaller the value of b (fatigue strength exponent) _____________ the fatigue life.
  ক

  longer

  খ

  shorter

  গ

  no relationship

  ঘ

  intermediate
• The Basquin’s equation is represented as ______________
  ক

  σa/2=σ’f (2N)b

  খ

  σa=σ’f (2N)b

  গ

  σa=σ’f (N)b

  ঘ

  σa/2=σ’f (N)b
• High cycle fatigue is described by the _______________
  ক

  Coffin-Manson equation

  খ

  Basquin’s equation

  গ

  Morrow’s equation

  ঘ

  Manson equation