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Mechanical Engineer Interview Questions

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Indeed’s Employer Resource Library helps businesses grow and manage their workforce. With over 15,000 articles in 6 languages, we offer tactical advice, how-tos and best practices to help businesses hire and retain great employees.

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Whether you are preparing to interview a candidate or applying for a job, review our list of top Mechanical Engineer interview questions and answers.

  1. What skills do you possess that make you a good Mechanical Engineer? See answer
  2. What computer programs have you used for mechanical engineering? See answer
  3. How do you keep up-to-date with current trends and knowledge in the mechanical engineering industry? See answer
  4. How do you explain complex designs or processes to non-engineers? See answer
  5. Why did you pursue a career as a Mechanical Engineer? See answer
  6. What engineering project would you say has been your most successful? See answer
  7. Have any of your projects failed? What happened? See answer
  8. How do you prevent flaws or check for them in your work? See answer
  9. What do you do to ensure you meet project deadlines? See answer
  10. Is tolerance important in mechanical engineering? Why? See answer
  11. What are the different fit types? See answer
  12. What type of control system do you prefer to use in your designs? See answer
  13. What’s the first thing you designed on your own?
  14. What’s a process flow diagram, and how do you use it in mechanical engineering?
  15. What’s a universal coupling, and how do you use it?
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Hire your next Mechanical Engineer today.

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Hire your next Mechanical Engineer today.

Post a job
Our mission

Indeed’s Employer Resource Library helps businesses grow and manage their workforce. With over 15,000 articles in 6 languages, we offer tactical advice, how-tos and best practices to help businesses hire and retain great employees.

Read our editorial guidelines

15 Mechanical Engineer Interview Questions and Answers

 What's the first thing you designed on your own?

The aim of this question is to assess the candidate's experience and get to know them better. What to look for in an answer:

  • Experience with design projects
  • Passion for engineering
  • Innovative creations

Example:

"The first thing I ever designed on my own was a robot in a high school class. I successfully created a robot that could throw a piece of garbage in the trash can. My robot actually won an award at the end of the year and my robotics teacher kept it to show future students."

What skills do you possess that make you a good Mechanical Engineer?

The aim of this question is to assess the candidate's understanding of the role and determine what skills they have. What to look for in an answer:

  • Possession of skills you're looking for in a Mechanical Engineer
  • Understanding of the role
  • Confidence in their skills

Example:

"One of my greatest skills as a Mechanical Engineer is my creative side and ability to come up with innovative ideas. I have a unique way of thinking that allows me to design and develop inventive projects. My innovative way of thinking helps me streamline processes and work more efficiently as well. I also have strong attention to detail and the ability to focus, which helps me on all of my mechanical engineering projects."

What computer programs have you used for mechanical engineering?

The aim of this question is to assess the candidate's experience with common mechanical engineering programs and tools. What to look for in an answer:

  • Experience with software or programs your company uses
  • Knowledge of common programs and software
  • Willingness to learn new software

Example:

"Over my five years as a Mechanical Engineer, I have used several computer programs. I use Fusion 360 and Solid Edge to create 3D models and designs. For equations and numerical analysis, I use MATLAB and Mathcad. When performing structural analysis, I use Robot Structural Analysis Professional. I also use Microsoft Excel to keep track of all my projects. I'm a quick learner and would be happy to learn how to use any other programs or tools."

How do you keep up-to-date with current trends and knowledge in the mechanical engineering industry?

The aim of this question is to assess the candidate's current knowledge and determine whether they are passionate about continuing their education. What to look for in an answer:

  • Willingness to learn more about mechanical engineering
  • Up-to-date industry knowledge
  • Passion for their career

Example:

"To stay up-to-date with current mechanical engineering trends, I enjoy reading magazines. Some of my favourite mechanical engineering magazines are Power Transmission Engineering and Machine Design Magazine. These always provide fun and easy-to-read articles that help me stay updated. I'm also a big fan of Twitter, so I follow a few engineering accounts like Engineering.com and Popular Mechanics. This way I see news or trending stories in the industry quickly."

How do you explain complex designs or processes to non-engineers?

The aim of this question is to assess the candidate's communication skills and ability to break down complex terms. What to look for in an answer:

  • Strong written and verbal communication skills
  • Willingness to explain complex designs or processes
  • Ability to articulate themselves well

Example:

"When explaining complex designs or processes to non-engineers, I find using visuals very helpful. For example, if I'm explaining how a car's axle system works, I'll show them a video or diagram of the system in progress. I then explain the design or process without using technical terms. I try not to oversimplify things though because I don't want to appear patronizing. I always encourage people to ask questions to ensure they fully understand the concept."

Why did you pursue a career as a Mechanical Engineer?

The aim of this question is to assess the candidate's motivation for their career. You can gauge their dedication and passion for the industry and their work. What to look for in a candidate's answer:

  • Understanding of the role and career path
  • Passion for mechanical engineering
  • Experience in a similar role

Example:

"I became a Mechanical Engineer because I've always been interested in how things work. Combined with my passion for saving the environment, mechanical engineering seemed like an obvious choice. It allows me to create new things to save the environment, such as solar panels and windmills. I'm constantly learning in this career as well, which is something I really enjoy doing."

What engineering project would you say has been your most successful?

The aim of this question is to assess the candidate's experience and technical skills. It also provides insight into the type of projects they enjoy. What to look for in a sound answer:

  • Experience as a mechanical engineer
  • Ability to complete projects successfully
  • Able to identify their contributions to successful projects

Example:

"At my previous company, we were looking for solutions to a dirty, crowded cafeteria as cleaners had a hard time keeping up with the demand. I had the idea to design a tray collecting robot that would roam around the cafeteria, allowing people to insert their dirty trays more conveniently. When the robot was full, it would take all the dirty trays to the back for a cleaner to empty. After a few months of using the robots, the cleaners and patrons were thrilled with the results. I consider it my most successful project as I came up with the idea, led the team and saw my vision come to life."

Have any of your projects failed? What happened?

The aim of this question is to assess the candidate's ability to acknowledge mistakes and learn from them. What to look for in an answer:

  • Honesty when discussing unsuccessful projects
  • Ability to learn from mistakes
  • Experience as a Mechanical Engineer

Example:

"One of my projects failed after the first trial because two of my calculations were slightly off. Once I fixed the numbers, the machine worked perfectly. Going forward, I started to double- and triple-check all of my calculations."

How do you prevent flaws or check for them in your work?

The aim of this question is to assess the candidate's analytical and problem-solving skills. What to look for in an answer:

  • Established process for reducing the risk of errors
  • Strong attention to detail
  • Analytical thinking

Example:

"As my work requires precision and relies on so many minor details, I always examine my work closely. I use computer programs, such as Mathcad to perform the calculations, but I always double-check the numbers I input. When a project is complete, I test it out multiple times and get a colleague to test it as well. I then check for functionality and safety before presenting it to anyone else."

What do you do to ensure you meet project deadlines?

The aim of this question is to assess the candidate's time-management skills and ability to adhere to deadlines. What to look for in an answer:

  • Strong time-management skills
  • Ability to multi-task
  • Experience working with strict deadlines

Example:

"As I often work on multiple projects at a time, I input all of my project deadlines into one calendar. This allows me to refer to my schedule constantly and quickly. I also make a weekly to-do list with all the projects I need to complete in order of their deadline. This ensures I stay organized and meet all deadlines."

What's a process flow diagram, and how do you use it in mechanical engineering?

The aim of this question is to test the candidate's technical knowledge. What to look for in an answer:

  • Understanding of what a process flow diagram is and how to use it
  • Experience working with process flow diagrams
  • In-depth industry knowledge

Example:

"A process flow diagram is a type of sketch that describes a product'sflow, equipment, connections, and the relationship between its components. It uses symbols to describe these components and outline the primary flow course. As mechanical engineers, we use process flow diagrams for several reasons, including documenting a process to analyze or optimize it."

Is tolerance important in mechanical engineering? Why?

The aim of this question is to test the candidate's technical knowledge and experience with industry terminology. What to look for in an answer:

  • In-depth industry knowledge
  • Understanding of tolerance and why it's important
  • Confidence when answering

Example:

"Tolerance is extremely important in mechanical engineering. Considering the tolerances between materials and components in every project is vital to its design. It allows you to forecast how well parts will fit together and analyze the margin for error. You can also use tolerances in the quality inspection stage to reduce costs and facilitate manufacturing as they project a product's reliability."

What are the different fit types?

The aim of this question is to assess the candidate's technical knowledge and experience. What to look for in an answer:

  • In-depth industry knowledge
  • Experience working with different fits
  • Understanding of the different types of fits

Example:

"There are three distinct groups of fits: clearance, interference and transition. A clearance fit is the clearance between two parts. An interference fit is the size of two mated parts. With this fit, the hole tolerance zone is less than the shaft tolerance zone. A transition fit is a mix of both fits as the components of both overlap."

What's a universal coupling and how do you use it?

The aim of this question is to test the candidate's understanding of important mechanical engineering terms, and the use for universal couplings. What to look for in an answer:

  • In-depth industry knowledge
  • Experience working with universal couplings
  • Knowledge of what a universal coupling is and how to use it

Example:

"A universal coupling is a part that connects two rigid rods or shafts. We called it by its other common name, a universal joint, in my last position. It consists of two hinges and a cross shaft. The universal coupling allows two objects to rotate. For example, a car uses a universal coupling to connect the driveshaft to the rear axle."

What type of control system do you prefer to use in your designs?

The aim of this question is to assess the candidate's experience with different control systems. You can also gauge their preference to see if it aligns with the control systems your company uses. What to look for in an answer:

  • Experience using your preferred control system
  • Knowledge of different control systems
  • Strong reasoning for preferring one control system over another

Example:

"When engineering a new device, I prefer to use a pneumatic control system over electromechanical or hydraulic systems. This is because pneumatic systems are cheaper, faster, more efficient, less complex, and cleaner in case of a leak."

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