Q.1.
The number of slip band in the fatigue is directly proportional to the number of cycles.
- a) True
- b) False
Q.2.
The fatigue crack propagation is _____________ in nature.
- a) intergranular
- b) transgranular
- c) along the high atomic density planes
- d) along the low-density atomic planes
Q.3.
The fatigue strain does not cause considerable strain hardening of successive cycle with growth of cracks.
- a) True
- b) False
Q.4.
The plastic blunting process is the growth mechanism of crack, followed by the ___________
- a) first stage of crack growth
- b) second stage of the crack growth
- c) third stage of the crack growth
- d) termination of the crack
Q.5.
With decrease in the temperature, the fatigue strength of the material ___________
- a) decreases
- b) increases
- c) remains constant
- d) no relationship
Q.6.
The crack propagation rate with stress is given as ______
- a) da/dN = C σam an
- b) da/dN = C σmm an
- c) da/dN = C σa a
- d) da/dN = σa a
Q.7.
The relationship between the stress intensity factor and crack growth is given as _______
- a) da/dN = A (ΔK)
- b) da/dN = A (ΔK)p
- c) da/dN = (ΔK)
- d) da/dN = A (1/ΔK)p
Q.8.
Increasing the mean stress ___________ the crack growth rate.
- a) increases
- b) decreases
- c) does not change
- d) no relationship
Q.9.
The correct graph to show the relationship between the crack growth rate (da/dN) vs stress intensity factor range (ΔK) is shown in the figure ________
- a)
- b)
- c)
- d)
Q.10.
In the given curve, the slope of the middle linear portion is equal to _________
- a) da/dN
- b) ΔK
- c) A
- d) p