Top 30 Mechanical Engineering Interview Questions and Answers in 2022

We will provide a list of frequently asked questions and answers on interviews in the field of mechanical engineering with the hope that it will be of assistance to you in achieving higher marks and give a great impression during your interview. Let’s get right down to business and begin with the list.

1. What Are Other Skills Besides Technical Know-How Important For Success In The Field Of Mechanical Engineering?

The ability to think analytically and to solve problems effectively is necessary. I see a synergistic relationship developing between each of those skills. When conceptualizing a new design, I am constantly considering how I can improve upon existing designs by either innovating new approaches or finding methods to expedite existing processes. At the same time, I have to locate the best answer that I can use to solve the problem. Flexibility is another crucial talent, and I make it a point to pay close attention whenever my team provides me with input since I don’t want to restrict myself in any way. The importance of communication cannot be overstated. Because we don’t operate in a vacuum, it’s important to me to keep a friendly demeanor and keep up an open line of communication, all while being able to convey complicated concepts to people who might not be familiar with all of the technical facets. In addition to all of that, I believe it is crucial to have the capacity to focus on a single activity for extended periods and to have undivided attention to detail.

2. What Was The Very First Engineering Design That You Ever Created?

My interest in questioning established norms and practices goes back a long time. Therefore, like most wannabe engineers, I began tinkering with various objects early. However, when I was in college, I got interested in the work of the Dutch artist Theo Jansen. His body of work convinced me that inventiveness and engineering are inextricably linked. And I adored how he could make his kinetic sculptures move by just something as basic as a rotary input. I fabricated a scaled-down replica of a typical Jansen linkage, employing his planar mechanism on the legs to create the walking movement, imitating works from the artist’s Strandbeest series and incorporating my aesthetic sensibilities wherever possible. The wind drove it, but it was successful anyway!

3. Which Aspects Of Mechanical Engineering Do You Take The Greatest Pleasure In?

To begin, one of my favorite things to do is to think of a problem, engage in some creative problem-solving, and then present a solution that makes logical sense. Consequently, the drawing board where I make my plans and schematics is undeniably one of the happiest places in the world for me. But in addition to that, I find that the more hands-on components of mechanical engineerings, such as putting together a prototype or directly overseeing a production process, are pretty exciting. Being a member of a talented team and working together to find solutions to problems is always really fulfilling.

4. How Do You Explain Complicated Designs To Someone Who Isn’t An Engineer?

When I’m not communicating with another engineer, I pay close attention to whether or not the terms I employ could be misunderstood by my audience. Whenever I have a conversation with an internal team member, I make it a point to explain concepts that the other person might not be familiar with. This could involve describing the properties of a particular material or elaborating on one of the laws of thermodynamics. However, if I need to discuss a full-on concept or design with a client, I will set up an in-person meeting and provide a visual presentation with step-by-step breakdowns. During the session, I will pause at regular intervals to ask if they have any questions, and I will also provide an opportunity for them to ask me questions. To round off this discussion, I’ll highlight how the design will assist them in general.

5. Are You Able To Define A P&ID, Also Known As A Piping And Instrumentation Diagram? And How Exactly Have You Utilized It In The Course Of Your Work?

Compared to a process flow diagram (PFD), which illustrates the overall flow of a plant process, a piping and instrumentation diagram is much more detailed. It outlines everything from processes, piping, mechanical equipment, instrumentation, and control devices, among other things. A PFD is used to depict the bigger picture of the flow of a plant process. During the design phase of a site-expansion project and installing a new industrial process control, I was responsible for drafting P&IDs in my most recent position at an automobile manufacturing plant. We worked on several distinct versions by compiling a variety of iterations of engineering designs for apparatus and instrumentation, in addition to data from initial flowcharts.

6. Pneumatic, Electromechanical, Or Hydraulic: Which System Do You Prefer To Control The Machinery You’re Designing?

Pneumatic systems have a lot going for them in my book, and here are some reasons. To begin, you will get the best value for your money because the components that make up the product are not very expensive. Pneumatics, on the other hand, is generally the most effective, as they rely on a continuous supply of compressed air and are currently utilized in various industries to move machinery. They are quick, trustworthy, and not overly complicated, yet they are safe, so there is no need to worry about any potential for explosions or fires.

7. What Keeps You Motivated Daily?

Taking care of both my body and my mind is the most effective approach for me to maintain my motivation. I get my day started well by exercising and a nutritious meal. This wholesome habit helps me feel ready to face the day with increased vitality and preparedness. In addition, before a particularly hectic day, I give myself five minutes to practice deep breathing exercises. These strategies assist me in maintaining my concentration and keeping my spirits up when I’m at work. Keeping a positive outlook allows me to maintain my productivity at work.

8. Do You Have Any Issues When It Comes To Delivering Information To Customers?

I can confidently say that I have a good deal of experience in public speaking. As of right now, I am in charge of presiding over the monthly meetings of our department. Because I have always enjoyed talking in front of other people, I was delighted when the opportunity to take on this responsibility presented itself to me. During these sessions, I inform attendees about upcoming projects or potential customers. In addition, I discuss the current status of the division as well as the objectives we have set for the following month. When it comes to presenting my design concepts in person to clients, I have no problem doing so. I’ve found that I’m reasonably excellent at expressing complicated engineering concepts in straightforward language, which I’m sure many customers would appreciate.

9. Have You Ever Been Involved In An Unsuccessful Project?

During college, I contributed to developing our capstone project as part of a group of five others. We aimed to create a potato launcher compatible with Bluetooth technology in our design. It was a fascinating idea, but our team couldn’t get it to function reliably by the time we had to demonstrate it. My disappointment stems from our inability to deliver a successful presentation. This assignment taught me that working together as a team is extremely important. We got along well, although we had difficulty dividing the various responsibilities among the team members.

10. Tell Me About A Moment When You Had A Challenge At Work And Were Able To Overcome It.

When I was in my former role, the company I worked for was looking to hire five interns with backgrounds in mechanical engineering. The only problem was that we did not have any structure for these students. I volunteered to build an engineering program. I compiled a list of things I would have liked to gain experience with during an internship and incorporated those ideas into the curriculum offered to interns. We provided them with target sheets to assist them in tracking their development and celebrated with them whenever they achieved milestones to encourage them and make them feel valued. After the internship program, we decided to offer full-time jobs to two of the interns who had demonstrated the most promise. The company continues to make use of the program.

11. How Do You Go As A Mechanical Engineering Team About Identifying And Fixing Errors?

In the job I had before this one, we had a system that included an automated and a manual application that we could utilize to look for any inconsistencies. I would begin each day by running an automatic system to determine whether or not any problems had arisen over the previous night. I reviewed the system one last time by hand, looking for any obstacles the automation system might have overlooked. If there are any, I will make an effort to correct them.

12. In What Ways Have You Found The Use Of Computer-Aided Design Tools To Be Beneficial In Mechanical Engineering?

Throughout my professional life, I’ve used various CAD programs. Although Solid Edge was my first CAD program, I am also proficient in AutoCAD, Creo Parametric, and SolidWorks. Because of their similarities, it’s simple to transition between these several programs. I like to utilize whichever program serves my current needs best, as they all have advantages.

13. If You Were To Be Employed, What Facet Of Mechanical Engineering Would You Prefer To Specialize In?

New product development is an area that interests me. Making something from scratch and testing it out in real life is a very thrilling experience for me. Working with other engineers to find and implement solutions is a fun and rewarding part of my job.

14. To What Extent Do You Comprehend The Product Safety Rules That Pertain To The Items You Design?

As a mechanical engineer, I know I must make sure the things I build won’t hurt others. When I embark on a new project, I first read up on the relevant safety rules. If I were to design a new car, I would closely examine the regulations set forth by the National Highway Traffic Safety Administration. My work would be reworked until the final product was up to par if I discovered it fell short of those criteria.

15. When Does It Make Sense To Use Trial And Error In The Mechanical Engineering Design Process?

The only way to know if your design will work is to try it and see what happens. However, I aim to employ this approach only when necessary due to the time commitment. Instead, I use software to make several iterations of my idea. Afterward, I evaluate the relative merits of each variant to determine the optimal solution. If I find that multiple parts of the plan need tweaking, I will do so before moving on with more tests.

16. Describe Your Approach For Testing A Product After You’ve Completed Designing It.

When I first get a new product, I put it through some durability and strength tests to ensure it can withstand everyday use. In addition, I evaluate the product’s ability to withstand either heat or cold, depending on what the product is intended to achieve. After this preliminary round of testing, I conduct additional, more in-depth tests to determine whether or not the product contains any vulnerable places or regions prone to wear and tear over time. This gives me the information I need to decide whether or not I need to redesign the product before it goes into mass production.

17. What Makes You Distinguish Out From Other Mechanical Engineers?

I think what makes me stand out is my ability to operate well under pressure. I am always prepared for tight deadlines and know how to prioritize work so I can accomplish them on time. Another thing that makes me unique is my ingenuity. I appreciate coming up with new solutions to problems and discovering ways to improve present designs.

18. How Often Do You Upgrade Your Knowledge And Abilities As A Mechanical Engineer?

As a mechanical engineer, I am continuously seeking new ways to strengthen the skills I already have. I recently completed a course on 3D modeling software offered online by MIT. It was challenging but ultimately gratifying, and it assisted me in gaining knowledge about the various kinds of modeling software on the market. Additionally, to keep up with the latest developments in mechanical engineering, I subscribe to several blogs by industry leaders.

19. There Is An Issue With A Product That You Were Responsible For Designing. How Do You Go About Locating The Source Of The Problem And Finding A Solution To It?

When I started working as a mechanical engineer, one of my first projects was to create a brand-new kind of automobile engine that would be more fuel-efficient than the ones on the market. After finishing the first draft of my design, I concluded that there were a few problems with how the engine cooled itself. It was necessary to alter the cooling system for it to be able to prevent the engine from becoming overheated. In collaboration with other engineers, I redesigned the cooling system, which ultimately led to the development of a motor that was economical with gasoline and reliable in terms of its operation.

20. What Exactly Do We Mean When We Talk About Mechanical Engineering?

Mechanical engineering is a branch of engineering that focuses on the design, analysis, manufacturing, and maintenance of mechanical systems. It is distinguished from other branches of engineering by its emphasis on the concepts of physics and materials science. Mechanical engineering is a subfield of engineering that focuses on the creation, assembly, and use of many types of machines and tools. We can demonstrate engineering in a variety of ways using technology. A bridge can be constructed by employing beams to bear the load, by an arc, or by hanging in a cable. Each of these methods demonstrates a different technology. Still, they all fall under the civil engineering category, and the applied science is laws of force and load distribution.

21. Because You Brought Up Tolerance, I Was Wondering If You Could Elaborate On The Significance Of Tolerance In Mechanical Engineering.

In the subject of mechanical engineering, tolerances are a critical consideration. We must always consider tolerances between the various materials and components during the design process. Tolerances are essential to the design and may also be utilized during quality inspections to cut costs and make manufacturing the components more straightforward.

22. Could You Go Over Some Of The Fundamental Principles That Should Be Followed When Designing Castings?

Regarding the design of castings, there are a few crucial rules you need to adhere to. These include designing the casting with simplicity as the primary goal, maintaining section thickness that is as uniform as possible, avoiding sudden changes in thickness, avoiding large flat surfaces because they are challenging to create, and utilizing curved shapes to improve the casting’s ability to handle stress.

23.  Would You Be Able To Explain What A Universal Coupling Is And How It’s Utilized In The Field Of Mechanical Engineering?

To put it more simply, a universal coupling comprises a pair of hinges joined by a cross shaft. Its purpose is to link two shafts, the axes of which are angled relative to one another. A vehicle with a universal coupling installed between the driveshaft and the rear axle is a good illustration of this arrangement.

24. Do You Think You Could Describe How Mechanical Refrigeration Works?

A heat exchange system uses mechanical refrigeration to extract heat from a piece of special equipment or place to maintain a cooler temperature. In most cases, the air is extracted from the vicinity and condensed. The heat produced by air condensation is expelled, and the resulting cooler air is recirculated throughout the area. Depending on the specific use of refrigeration, the refrigeration system may be magnetic, thermoelectric, cyclic, or non-cyclic. It may also be thermoelectric.

25. Just What Is This Oee Thing?

OEE is Overall Equipment Effectiveness. This term is utilized extensively in Total Productive Maintenance (TPM), a method for determining the efficiency of machinery used in production. In essence, it accounts for the losses that machines incur throughout production and works to reduce the number of flaws that machines have. When the OEE is higher, the machine is more capable.

26. How To Calculate Conveyor Mph?

Calculate the diameter of the rollers that the conveyor belt is wound around.

Pi (3.14159) times the diameter of the roller. This computation will produce the rollers’ circumference. The roller will move the conveyor a linear distance equal to the radius of the roller every time the roller spins one revolution. Pi is a dimensionless factor, meaning it does not matter if it is measured in inches, centimeters, or any other unit of measurement. Calculate the rollers’ revolutions per minute (RPM). Count how many complete revolutions (rotations) the roller makes in one minute. Multiply the RPM by the roller’s circumference. The linear distance covered by a point on the conveyor belt in one minute will be calculated using this formula.

27. In Mechanical Engineering, What Is The Difference Between Projectile Motion And Rocket Motion?

Because no motor or rocket is attached to a projectile, all of its momenta is transferred to it when it is launched. One could consider a pen hurled across a room as an example of a projectile. A rocket or missile must have a motor or rocket attached to it for it to be able to accelerate itself while in motion and successfully combat other forces, such as gravity. From the mechanics’ perspective, a projectile does not have any particular shape because it is a point mass. On the other hand, the rocket has a specific form, and as a result, its center of gravity is located at a particular place on its body. Therefore, the motion of a rocket falls under the category of kinetics, while the motion of a projectile falls under the category of kinematics.

28. What Kinds Of Pipes Are Often Used For Steam Lines And Why?

When deciding what material to use, pressure and temperature are two of the most significant aspects that need to be considered first. Because steam is a gas that may be compressed, the pipeline’s capacity is dependent on the size of the pipes in addition to the pressure that the steam is under. Extra caution is required wherever steam is present since its potential for harm exists even at low pressures. In most cases, galvanized pipes are not utilized for transporting steam. Instead, most of the time, we use mild steel pipes with fittings that are welded on.

29. What Exactly Is Meant By The Term “Ductile-Brittle Transition Temperature”?

The temperature at which material goes from being ductile to brittle is determined by determining the lowest temperature at which a material may retain its ability to absorb a given quantity of energy without cracking. When temperatures drop, a material loses some of its capacity to be deformed into a ductile state by applying force. A Charpy impact test is typically used to conduct these measurements, and each is done individually.

30. What Exactly Is Meant By The Term “Viscosity,” And Why Is It So Extremely Important?

Viscosity is a term that describes the thickness of any fluid. Honey, for instance, has a higher viscosity than water. When you consider the fact that there are fluids with varying densities, the circumstances can shift significantly. On the molecular level, the viscosity of a fluid can be thought of as the result of the interactions between the many molecules that make up the fluid. Another name for this phenomenon is “friction” between the molecules that make up the fluid. It is the energy that is necessary for the flow of the fluid. This is a significant parameter since it affects heat development in the bearings, gear sets, and cylinders. When it comes to oils, the oil’s viscosity affects the flow resistance.


Any candidate who shows up for an interview for the position of Mechanical Engineer will be examined on fundamental abilities that they are expected to have acquired during their studies in engineering schools. Therefore, it is crucial to go into the interview with knowledge about the potential new company, the interviewer’s background, and some talking points about yourself. Good luck!