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Which of the following methods can improve the fatigue strength of a circular mild steel (MS) shaft?

1. Enhancing surface finish
2. Shot peening of the shaft
3. Increasing relative humidity
4. Reducing relative humidity

Correct answer: Shot peening of the shaft

Solution

Shot peening introduces compressive residual stresses on the surface of the shaft, which helps to counteract the tensile stresses that contribute to fatigue failure, thereby improving its fatigue strength.

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