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Mechanical Metallurgy
Mechanical Metallurgy Written Test
Quiz 1
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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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