GATE Machine Design: Fatigue strength and S-N diagram – Previous Year Questions

4 GATE previous year questions on Fatigue strength and S-N diagram (Machine Design, Mechanical Engineering) with answers and explanations, from every paper.

1. GATE 2022 ME (ME1) Q29 (1 mark, Multiple select) – Which of the following methods can improve the fatigue strength of a circular mild steel (MS) shaft?
2. GATE 2023 ME Q18 (1 mark, Multiple choice) – The S-N curve from a fatigue test for steel is shown. Which one of the options gives the endurance limit?
3. GATE 2024 ME Q26 (1 mark, Multiple choice) – Which one of the following failure theories is the most conservative design approach against fatigue failure?
4. GATE 2025 ME Q43 (2 marks, Multiple choice) – The endurance limit of a specific grade of steel is same as its yield strength. The ultimate strength of this grade of steel is twice of its yield…