Last updated on Feb 06, 2023
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Most Frequently Asked Mechanical Interview Questions

Here in this article, we will be listing frequently asked Mechanical Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What is Mechanical Engineering?

Mechanical engineering is one of the professional branches of engineering which deals with the application of the principles of Material Science and Physics. It is a discipline which has the purpose of manufacturing, analyzing, maintaining and designing od the mechanical systems. There are several factors which consist of the production and the usage of mechanical power and heat for the operation, designing and production of the tools and their respective machines. You need to learn mechanics, kinematics, thermodynamics, materials science, and structural analysis to ace the engineering branch.

Q2. What are the 1st 2nd and 3rd laws of thermodynamics?
First Law

Law of Conservation of Energy or the first law of thermodynamics states that there is no creation or destruction of energy, but it can only be changed or transferred from one form to another.

The Second Law of Thermodynamics

Here in this law, it states that there is a rise in the isolated system’s entropy. It is because the systems evolve towards thermal equilibrium. It is the state where the system has maximum entropy. It means that there is a rise in the entropy of the universe, no decrease.

The Third Law of Thermodynamics

With the approaching of the temperature to absolute zero, the entropy of a system approaches a constant value as defined in the third law of thermodynamics. All the different ground states help in the determination of the entropy value.

Q3. What is ferrite material and explain its applications?

The material used in several types of electronic types is Ferrite. It is a ceramic-like material which contains magnetic properties and is used in permanent magnets, toroidal inductors, computer memory elements.

Q4. What is viscosity and why is it important?

The thickness of any fluid is known as viscosity. For example, honey has higher viscosity as compared to water. There are fluids with different densities, and things can change on considering this factor. The outcome of the interaction between the different molecules in a fluid can also be termed as viscosity as the molecular level. It is also known as friction between the molecules in the fluid. It is the energy needed for the fluid flow.

This is an important parameter as it affects heat generation in cylinders, bearings and gear sets. In the case of oils, viscosity determines the resistance flow.

Q5. How many types of fits are there?
• Interference Fit
• Transition Fit
• Clearance Fit

You can easily get marks in this Mechanical engineering Interview Question by just naming the types of fits in mechanical engineering.

Q6. Why is heat treatment required?

The heat treatment is required for the hardened materials for improving their dimensional stability and toughness. They are usually tempered or stress relieved for obtaining enhanced mechanical properties. Examples are increased hardness or strength.

Q7. Explain the difference between projectile motion and trajectory?
S.no Projectile Trajectory
1. It is an object. It is the path an object which it follows by the time of coming under the gravity’s influence.
2. Examples can be a rocket payload, a BB pellet, a bullet, a rock. A rocket launched from the earth and traveling to reach the moon.
Q8. Who discovered non-Newtonian fluids?

Non-Newtonian Fluid was discovered by Sir Isaac Newton.

Q9. What is the difference between Newtonian and non-Newtonian fluids?