Q.1
The corrosion fatigue is defined as the _________
  • a) chemical attack
  • b) stress
  • c) cycle stress
  • d) chemical attack and cycle stress
Q.2
Which one of the following is only present in the corrosion fatigue?
  • a) Crack on surface
  • b) Pits on surface
  • c) Striation marks
  • d) Benchmarks
Q.3
Is it possible that the material which shows the fatigue limit in normal environment does not show any endurance limit in a corrosive environment.
  • a) True
  • b) False
Q.4
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.
  • a) more
  • b) less
  • c) equal
  • d) no pattern
Q.5
The stainless steel components are coated with _________ to control the fatigue corrosion.
  • a) copper
  • b) zinc
  • c) aluminum
  • d) gold
Q.6
The fretting is the process of ____________
  • a) corrosion due to water
  • b) relative motion between 2 metal causing the corrosion
  • c) corrosion due to air
  • d) fatigue due to excessive stress
Q.7
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.
  • a) True
  • b) False
Q.8
The fatigue strength of the metal ____________ with increasing temperature.
  • a) increases
  • b) decrease
  • c) remains the same
  • d) no relation
Q.9
Which of the following statement is correct?
  • a) Fatigue and creep both are transcrystalline
  • b) Fatigue and creep both are intercrystalline
  • c) Fatigue is transcrystalline while the creep is intercrystalline
  • d) Fatigue is intercrystalline while the creep is transcrystalline
Q.10
At any given temperature, the creep will __________ with increasing mean stress.
  • a) decrease
  • b) increase
  • c) remain the same
  • d) no relation
Q.11
The fatigue strength of the material ___________ as the grain decreases.
  • a) increases
  • b) decreases
  • c) remains the same
  • d) no relation
Q.12
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 ___________
  • a) intergranular, intergranular
  • b) transgranular, transgranuler
  • c) intergranular, transgranular
  • d) transgranuler, intergranular
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