Mechanical Engineering technical Interview Questions answers

Mechanical Engineering Technical Interview questions answers

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Mechanical Engineering technical Interview Questions answers

Question No.1  Define fatigue.

Answer: When a material is subjected to repeated stress, it fails at stresses below the yield point stress; such type of failure of the material is called fatigue.

Question No.2 Define Factor of safety.

Answer: The ratio between maximum stresses to working stress is known as the factor of safety.

The factor of safety = Maximum stress /Working stress.

Question No.3 What is the impact load?

Answer: If the time of load application is less than one-third of the lowest natural period of vibration of the part, it is called an impact load.

Question No.4 What are the various phases of the design process?

Answer: The various phases of the design process are:

1. Recognition of need.
2. Definition of problem
3. Synthesis
4. Analysis and optimization
5. Evaluation
6. Presentation
Question No.5Differentiate between repeated stress and reversed stress.

Answer: Repeated stress refers to a stress varying from zero to a maximum value of same nature. The reversed stress of cyclic stress varies from one value of tension to the same value of compression.

Question No.6Define stress concentration and stress concentration factor.

Answer: Stress concentration is the increase in local stresses at points of rapid change in cross-section or discontinuities.

Stress concentration factor is the ratio of maximum stress at the critical section to the nominal stress.

Answer: While selecting a material for a machine element, the following factors are to be considered
1. Material availability
2. Manufacturing ease
3. Required material properties
4. Cost
Answer: Some of the methods are:
1. Use of multiple holes instead of the single hole.
2. Undercutting the shoulder parts.
3. Providing fillets.
4. Avoiding sharp.
Question No.9Explain notch sensitivity. What are the factors that affect notch sensitivity?

Answer: Notch sensitivity (q) is the degree to which the theoretical effect of stress concentration is actually reached.

The factors affecting notch sensitivity are:

2. Size of component
4. Material
5. Grain Structure
Question No.10What are the different types of loads that can act on machine components?

This post is shared by Mr. R.P. Singh has 20 years of working experience.

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