Technical Interview Questions for Fresher Mechanical Design Engineers

According to the requirements and scope of work, interviewer ask questions. Interviewer can ask questions about your summer training, final year project and subject of your choice. 

In this article, we will discuss commonly asked interview questions from prospective fresher design engineers. 

What are engineering tolerance?

Tolerance is allowable variation in given size. In another words, it is the total amount by which a given dimension may vary without affecting function of the product.

Tolerance (for hole) = Hole (MMC) – Hole (LMC)

Why Tolerance are Required?

Refer this link for answer

What do you understand by fit?

The term fit refers to the permissible clearances between mating parts. In another words,  “Engineering Fit” is the clearance between two mating parts. This clearance determines the type of Fit. check out in detail about fit here

What are the different types of fits?

  1. Clearance Fit
  2. Interference Fit
  3. Transition Fit

What are the types of tolerance?

  1. Unilateral Tolerance
  2. Bilateral Tolerance

What do you understand you Engineering Drawing?

Engineering drawing is a technical document used to transfer technical information, define requirements. In other words, its a graphical language that communicates ideas and information from one mind to another.

What is Section, Projection, Isometric & Detailed View?

  • Projection View : Projection view represents a 3 dimensional objects in 2 dimensions.
  • Section View: Sections clarify the interior construction of a part in engineering drawing.
  • Isometric View: Isometric projection represents a 3D objects into 2D in a technical and engineering drawings. In isometric view three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees.
  • Detailed View: Detailed view represents the larger view of any section in engineering drawing

What are types of projections used to make engineering drawings?

Following two types of projections are used :

  • First Angle Projection
  • Third Angle projection

What is the symbol of 1st and 3rd angle projection?

First Angle Projection

Third Angle Projection

What is least count and how it is calculated?

The smallest value, measured by the measuring instrument is known as least count. For example, least count of a normal scale is 1mm and vernier scale is 0.01 mm. 

Theoretically Least Count= Value of one main scale Division – Total Number of Vernier scale division

What is the least count of Vernier Scale, Micrometer & normal scale?

  • Least Count for vernier = 0.01 mm (Digital) , 0.02 mm (manual)
  • Least Count for micrometer = 0.01 mm
  • Least count of normal scale = 1 mm 

What is factor of safety and how it is calculated?

FOS describes the load carrying capacity of a system beyond the expected or actual loads. In another words, FOS represents : how much stronger the system is compared to intended load.

FOS is calculated considering max value of design load. Value of FOS should be always more than 1.

What are the different types of screws?

Screws can be classified based on following parameters:

Based on Screw Head

  1. Counter Sunk Screw
  2. Raised or oval head screw
  3. Pan Head Screw
  4. Flat Head Screw
  5. Flange Head Screw

Based on Screw Drive Type

  1. Sloted
  2. Phillip 
  3. Pozi Drive
  4. Torx Head
  5. Hex Socket
  6. Trangular head
  7. Security Head Socket

Based on Screw Thread Type

  1. Machine Screw
  2. Thread Forming
  3. Thread Cutting Screw

What are Section, Break and centre line?

What is the difference between 1st and 3rd angle projection?

What is the difference between Size dimension & Location dimension?

What are ordinate dimensions?

What is datum plane?

What are different surface finish symbols?

What are different welding symbols?

What are the GD&T symbols?

What are the various manufacturing process?

What are commonly used machining operations?

What do you understand by Sheet Metal?

What is injection moulding?

Tell me in brief what task you Performed during your Industrial Training?

Explain what task you performed during your industrial training, what you learn there. interviewer can ask you technical questions about what you learned there.

Tell us in about your Final Year Project?

Start with aim of the project, explain briefly what you are did in your project & what you learned from this. Interviewer can ask you technical questions about your Project.

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