Interview Questions for Mechanical Engineering

 Mechanical Engineering

Mechanical engineering is the subject that applies engineering, physics, and material science principles to design, analyse, manufacture and maintain mechanical system. The role of a mechanical engineer is to take a product from an idea to the marketplace. Mechanical engineers play key roles in a wide range of industries including automotive, aerospace, biotechnology, computers, electronics, microelectromechanical systems, energy conversion, robotics and automation and manufacturing.

Q1. Can you tell me something about yourself?

A: Speak about your experience, background, and your passion for mechanical engineering. You can even talk a bit about your education, and how it prepared you for the role. Mention briefly one or two hobbies from your personal life–this helps to break the ice, and to create a friendly atmosphere in the room (if it’s not relaxed already).

Q2. What is view Factor?

A: View factor is depending upon geometry of the two surfaces exchanging radiation.

Q3. Why do you want to become a mechanical engineer?

A: Focus on your motivation, passion for this job, and also confidence in your designing and engineering skills. You should also say that you enjoy doing what engineers generally do, and can’t imagine having any other job at this stage of your career. Do not talk about money. Obviously, mechanical engineers earn a lot, and they deserve it. But you should not point out a great salary as a reason for your job choice.

Q4. What if you are not selected?

A: If I selected I will be a part of your company if not I will be one of your Clint are customer. Or It Doesn’t Matter…..I m sure that i m selected.

Q5. Do you ever hear the name of the company before our visit to your college?

A: Yes

Q6.  What are orthotropic materials?

A: It is a Special class of anisotropic materials which can be described by giving their properties inthree perpendicular directions.

Ex: Wood, Composites.

Q7. What is heat treatment and why is it done?

A: Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows:

1. In order to improve the hardness of metals.
2. For the softening of the metal.
3. In order to improve the machinability of the metal.
4. To change the grain size.
5. To provide better resistance to heat, corrosion, wear etc.

Heat treatment is generally performed in the following ways:

1. Normalizing
2. Annealing
3. Spheroid sing
4. Hardening
5. Tempering
6. Surface or case hardening

Q8. Mention two types of Dislocations?

A: Dislocations refers to break in the continuity of lattice. In edge dislocation, one plane of atoms gets squeezed out. In Screw Dislocation the lattice atoms move from their regular ideal position.

Q9. Where do you see yourself five years from now?

A: Your new employer is going to invest a lot of time and money in your training and development, and they don’t want to hear that you get bored easily and will likely look for opportunities elsewhere before too long.

“I would like to start out in this role as a junior engineer and master the technical skills necessary to move onto a more senior position

Q10. What is Curie point?

A: Curie point is the temperature at which ferromagnetic materials can no longer be magnetized by outside forces.

Q11.  Why are you interested in a position with our company?

A: I want to work for this company because of your commitment to diversity. As a minority, working for a company that values all types of people and experience is important to me.

Q12. What is the percentage of carbon in cast iron?

A: 2.5%

Q13.  Explain the second law of thermodynamics.

A: The entropy of the universe increases over time and moves towards a maximum value

Q14.  What is ferrite?

A: Magnetic iron rock

Q15. What is the difference between projectile motion and a rocket motion?

A: A projectile has no motor/rocket on it, so all of its momentum is given to it as it is launched. An example of a projectile would be pen that you throw across a room. A rocket or missile does have a motor/rocket on it so it can accelerate itself while moving and so resist other forces such as gravity.

Q16. Which element is added in steel to increase resistance to corrosion?

A: Chromium

Q17.  Why should we select you for this position?

A: I have a great foundation of technical skills that I would bring to the role along with my drive and work ethic. I’m also great with people and am confident I would easily fit in to the organization and contribute to your strong workplace culture.

Q18. What is the alloy of tin and lead?

A: A tin and lead alloy is commonly called solder. Usually solder is a wire with a rosin core used for soldering. The rosin core acts as a flux.

Q19.  What are the precautions to be taken to avoid fire?

• The buckets along with sand should be placed inside the workshop.
• Switches and other electrical parts must be made of fireproof material.
• Carbon dioxide gas should be place at required points in special containers.
• Fire extinguishers of suitable type should be placed at accessible places.

Q20. What is gear ratio?

A: It is the ratio of the number of revolutions of the pinion gear to one revolution of the idler gear.

Q21. For which parts the Wahl Factor and Levis form factor used?

 A: For Springs and gears respectively

Q22. What are the factors that can affect the Factor of safety selection?

The factor of safety is used in designing a machine component. Prior to selecting the correct factor of safety certain points must be taken into consideration such as:

• The properties of the material used for the machine and the changes in its intrinsic properties over the time period of service.
• The accuracy and authenticity of test results to the actual machine parts.
• The applied load reliability.
• The limit of stresses (localized).
• The loss of property and life in case of failures.
• The limit of initial stresses at the time period of manufacture.
• The extent to which the assumptions can be simplified.

The factor of safety also depends on numerous other considerations such as the material, the method of manufacturing , the various types of stress, the part shapes etc.

Q23. Explain the difference between pearlite and cementile?

A: Pearlite is eutectoid mixture of ferrite and cementile. Cementile is chemical compound of iron and carbon.

Q24.  What are the functions of a scale?

1. To measure distance accurately.
2. For making drawing to scale either in full size, reduced size or enlarged size.

Q25. How are thin materials shown in sectional drawing?

Thin materials such as sheets, gaskets and electrical sections are shown solid in section and adjoining parts should be separated by a small space.

Q26. What is the plane of projection?

It is the plane on which the projection of the object is taken.

Q27. What is burnt out point?

A: It corresponds to maximum heat flux at which transition occurs from nucleate boiling to film boiling.

Q28. How much Resistance is offered to heat flow by drop wise condensation?

A: Nil

Q29. Can you describe a situation where you dealt with a difficult client?

A: When I was a summer intern, I didn’t do a lot of engineering work, but I did do a lot of contract preparation. There was a difficult client who kept pushing back on the contract terms, and this was delaying the project. After a few emails and phone calls were exchanged, I asked the client to come in and meet with the project team and me. I thought a face-to-face meeting would help diffuse the situation and reassure the client that we wanted to make them happy. It worked, and we were able to move forward.” Or

I suggested that my client listen carefully in their next meeting and mirror the terms that his customer used. It worked. They were on the same page, accomplishing what needed to be done, with zero conflict. Mirroring your customers’ words can help put them at ease and assures them that you understand their needs.