Video: Basic Mechanical Questions for PSU and State PSC Interviews

Introduction:
In this video, we will cover basic mechanical questions that are commonly asked in PSU and State PSC interviews. These questions will help you understand the fundamental concepts of mechanical engineering and prepare you for your upcoming interviews.

1. Engineering Mechanics:
Engineering mechanics is the branch of science that deals with the behavior of physical bodies when subjected to various forces or loads. It involves the study of motion, equilibrium, and deformation of solid and fluid bodies.

Key Points:
- Engineering mechanics is divided into two major branches: statics and dynamics.
- Statics deals with the equilibrium of bodies at rest, while dynamics deals with the motion of bodies.
- It provides a foundation for several other branches of engineering such as structural analysis, fluid mechanics, and machine design.

2. Basic Mechanical Questions:
Let's now discuss some basic mechanical questions that are frequently asked in PSU and State PSC interviews:

Key Points:
- These questions are designed to assess your understanding of fundamental mechanical concepts.
- It is important to have a clear understanding of these concepts as they form the basis of more complex topics.

2.1. What is the difference between stress and strain?
- Stress is the internal resistance offered by a material to deformation, while strain is the measure of deformation caused by stress.
- Stress is measured in units of force per unit area (N/m² or Pa), while strain is dimensionless.

2.2. What is the difference between static and dynamic equilibrium?
- Static equilibrium occurs when the net force and net moment acting on a body are both zero.
- Dynamic equilibrium occurs when a body is in motion but experiences zero net force and zero net moment.

2.3. Define the term "moment of inertia."
- Moment of inertia is a measure of an object's resistance to changes in its rotational motion.
- It is the sum of the products of the mass of each particle in the object and the square of its perpendicular distance from the axis of rotation.

2.4. Explain the concept of friction.
- Friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact.
- It can be classified into two types: static friction (when the object is at rest) and kinetic friction (when the object is in motion).

Conclusion:
In this video, we covered basic mechanical questions that are commonly asked in PSU and State PSC interviews. Understanding these concepts will help you excel in your interviews and build a strong foundation in mechanical engineering. Stay tuned for more educational videos on EduRev.