Mechanical Engineer Mock Interview

Master 37 Mechanical Engineer interview questions covering thermodynamics, CAD proficiency, and design problem-solving.

Question 27 of 37

What does 'circularity' refer to?

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Jason is a freelance mechanical engineer specializing in 3D Printing and CNC Machining.

Your interviewer will likely ask you knowledge-based questions to understand how well you are able to explain concepts to others. Be prepared for questions like this one by practicing a few possibilities ahead of time. In this case, circularity refers to a type of geometric dimensioning and tolerancing (GD&T) callout. It describes how close an object's surface is to a true circle. It's also sometimes called roundness. Its value corresponds to the distance between two concentric circles that contain the deviation of a 2D profile or cross section. The three-dimensional version is referred to as cylindricity. GD&T callouts like this are very useful when communicating designs to manufacturers, and knowing them well can help you stand out in a mechanical engineering interview.

Jason Toby

Jason is a freelance mechanical engineer specializing in 3D Printing and CNC Machining.

"Circularity is a type of GD&T callout. It measures how much a circular profile deviates from a true circle, and is measured on a 2D profile and not a 3D surface. It can be measured via a dial gauge that is set up on a lathe, measuring the total variation that the gauge travels in one rotation. In design, I would use circularity if I was concerned with the overall variation of a specific circular profile, rather than the cylindricity across the entire surface."

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37Mechanical Engineer Interview Questions & Answers

1.Why did you become a mechanical engineer?

2.Where do you see yourself going in your career, and how will this role help you get there?

3.What do you know about our company?

4.What interests you about working for our company?

5.What is your ideal work environment?

6.Can you tell me about a project you've worked on?

7.What types of manufacturing technologies have you worked with?

8.What is your 'shop' experience?

9.How would you describe your communication style?

10.How would you calculate the number of manholes in New York City?

11.What is a free-body diagram? When would you use one?

12.What are the phases of the Carnot cycle?

13.What is a Factor of Safety (FoS), and when would you use it?

14.What is the difference between static friction and kinetic friction?

15.How would you calculate the maximum deflection of a cantilevered beam?

16.You have a lever that must lift 50 pounds. The lever is 1 foot long with a fulcrum point 4 inches from the right side, which must supply the lifting force. How much force needs to be applied to the left-hand side? What mechanical advantage is this?

17.A gear rotates at 5 rpm and interfaces with a smaller gear in a 10:1 ratio. How fast does the second gear spin? If the first gear applies 10N*m of torque, then what does the second gear experience?

18.A force of 5 N compresses two identical springs in series by 10 cm. What will be the total distance that the same springs in parallel are compressed?

19.How would you define a simple machine? What is an example?

20.What types of standard views do you include in a drawing for manufacture?

21.What is the difference between an interference fit and a clearance fit, and when might you use them?

22.Why are screws generally not ideal for location in fixture design? What is a better way to do it?

23.In CAD Design, what is 'surface modeling,' and what makes it different from 'solid modeling?'

24.What does 'parametric' refer with regards to 3D modeling software?

25.What is the difference between 'top-down' and 'bottom-up' design?

26.You're inspecting the surface of a machined steel plate to make sure it is within 0.005 inches of flatness across its surface. What does flatness refer to, and how do you measure it?

27.What does 'circularity' refer to?

28.What is the difference between stainless steel and tool steel?

29.You're asked to take the design for a load-bearing steel plate and create an aluminum design that can withstand the same load. What design considerations would you keep in mind?

30.What is the 'Young's Modulus' of a material?

31.What does 'cold working' refer to? What effect does this have on a material's properties?

32.What is the difference between an end-mill and a drill-bit?

33.Why are sharp corners on internal geometry very difficult to machine?

34.You're designing a machined cylindrical part that is 0.525 inches in diameter with a 1/4 -20 threaded hole in its center. What shop equipment would you most likely use to manufacture this?