20+ Mechanical Engg. Design Interview Questions and Answers for Freshers

Centre of gravity is the point where the entire weight of an object can be considered to act upon. Formula for an asymmetrical I section is (A1*d1 + A2*d2)/(A1+A2)

• Centre of gravity is important in designing structures and machines to ensure stability and balance

• It is the point where the object will balance perfectly in any orientation

• For an asymmetrical I section, the formula is (A1*d1 + A2*d2)/(A1+A2) where A1 and A2 are the areas of the two flanges and d1 and d2 are the dis...read more

Ferrous components contain iron, while non-ferrous components do not.

• Ferrous components are magnetic, while non-ferrous components are not.

• Ferrous components are prone to rust and corrosion, while non-ferrous components are more resistant.

• Examples of ferrous components include steel and cast iron, while examples of non-ferrous components include aluminum and copper.

Solidworks 3D modeling basics include sketching, extruding, revolving, lofting, and filleting.

• Sketching: creating 2D profiles

• Extruding: pulling a sketch into a 3D shape

• Revolving: rotating a sketch around an axis to create a 3D shape

• Lofting: creating a shape by blending two or more profiles

• Filleting: rounding edges and corners

Yes, I have experience in creating technical documents such as design specifications, assembly instructions, and test reports.

• I have created design specifications for various projects, outlining the requirements and constraints for the design.

• I have also created assembly instructions for the manufacturing team to follow during production.

• Additionally, I have written test reports to document the results of product testing and analysis.

• I am proficient in using software such as ...read more

I have extensive experience with design softwares such as AutoCAD, SolidWorks, and CATIA.

• Proficient in AutoCAD for 2D drafting and modeling

• Skilled in SolidWorks for 3D modeling and simulation

• Experience with CATIA for advanced surface modeling and assembly design

I have handled a variety of projects including product design, prototyping, and testing.

• Designed and developed a new product for a client in the consumer electronics industry

• Managed the prototyping and testing phases of a medical device project

• Collaborated with a team to improve the efficiency of a manufacturing process

• Implemented design changes to improve the performance of an existing product

• Worked on a project to reduce the environmental impact of a manufacturing facility

Sections in mechanical engineering design refer to the shapes of cross-sections of structural members.

• Sections can be classified as open or closed.

• Open sections have an opening or a void in the cross-section, such as a C-channel or an I-beam.

• Closed sections have a continuous cross-section, such as a rectangular or circular tube.

• Sections can also be classified based on their shape, such as square, rectangular, circular, or elliptical.

• The choice of section depends on the struct...read more

Draw sfd and bmd for a simple cantilever beam

• SFD shows the variation of shear force along the length of the beam

• BMD shows the variation of bending moment along the length of the beam

• Shear force is maximum at the fixed end and zero at the free end

• Bending moment is maximum at the free end and zero at the fixed end

CATIA v5 with generative sheet metal module is tested using various tools

• Tools like bend, cut, flange, and stamp are tested

• The accuracy and efficiency of the tools are evaluated

• The ability to create complex sheet metal parts is assessed

• The compatibility with other CAD software is also checked

• Examples of sheet metal parts designed using CATIA v5 can be shown

Yes, there are technical issues and problems in computers.

• Hardware failures such as hard drive crashes or overheating

• Software bugs and glitches

• Security vulnerabilities and hacking

• Compatibility issues with different operating systems or software

• Slow performance due to insufficient memory or processing power

First angle projection places the object in the first quadrant, while third angle projection places it in the third quadrant.

• First angle projection: Object is placed in the first quadrant, with views projected onto the opposite plane.

• Third angle projection: Object is placed in the third quadrant, with views projected onto the same plane.

• Example of first angle: A top view appears below the front view.

• Example of third angle: A top view appears above the front view.

• First angle i...read more

3-2-1 principle is a design guideline for creating a machined part that can be easily located and clamped in a machining operation.

• The principle involves adding three locating surfaces on one face of the part, two on a perpendicular face, and one on the final face.

• The three locating surfaces on one face are used to position the part in the X, Y, and Z directions.

• The two locating surfaces on the perpendicular face are used to position the part in the remaining two directions.

• T...read more

IP stands for Intellectual Property, which refers to creations of the mind, such as inventions, literary and artistic works, designs, symbols, names, and images used in commerce.

• IP refers to creations of the mind that are protected by law.

• It includes inventions, literary and artistic works, designs, symbols, names, and images used in commerce.

• IP can be protected through patents, copyrights, trademarks, and trade secrets.

• Companies often invest in protecting their IP to maintai...read more

Stress is the force applied to a material, while strain is the resulting deformation or change in shape.

• Stress is the internal resistance of a material to deformation under an applied force.

• Strain is the measure of deformation or change in shape of a material due to stress.

• Stress is typically measured in units of force per unit area (such as N/m^2 or psi).

• Strain is a dimensionless quantity, often expressed as a percentage or in terms of length change.

• Example: When a metal rod...read more

Factor of safety ensures design reliability, while pitch is the distance between adjacent threads on a screw.

• Factor of safety is the ratio of the maximum stress a material can withstand to the maximum stress it is subjected to in a design.

• A factor of safety of 2 means the material can withstand twice the maximum stress it will experience in the design.

• Pitch is the distance between adjacent threads on a screw or a gear.

• For example, a screw with a pitch of 1mm means there is a ...read more

Casting is a manufacturing process in which a liquid material is poured into a mold and allowed to solidify.

• Types of casting include sand casting, investment casting, die casting, and continuous casting.

• Sand casting involves pouring molten metal into a sand mold.

• Investment casting involves creating a wax pattern and then coating it in ceramic before pouring in the molten metal.

• Die casting involves injecting molten metal into a mold under high pressure.

• Continuous casting invol...read more

Types of bearings include ball, roller, plain, and magnetic. Welding methods include MIG, TIG, and stick welding.

• Ball bearings use balls to reduce friction and support radial and axial loads.

• Roller bearings use cylindrical or tapered rollers to support heavy loads.

• Plain bearings have a sliding surface and are used for low-speed and high-load applications.

• Magnetic bearings use magnetic fields to support rotating shafts.

• MIG welding uses a wire electrode and shielding gas to joi...read more

Stress strain graph of steel shows the relationship between stress and strain during deformation.

• The graph typically consists of a linear elastic region, a yield point, a plastic region, and a fracture point.

• The slope of the linear region represents the Young's Modulus of the material.

• The yield point indicates the stress at which the material begins to deform plastically.

• Steel generally has a high yield strength and ultimate tensile strength compared to other materials.

• The ar...read more

My current CTC in the last company was $70,000 per annum.

• My current CTC in the last company was $70,000 per annum.

• I received an annual salary of $70,000 in my previous job.

• My last company paid me a CTC of $70,000 per year.

Designing a complex sheet metal part requires understanding of material properties, manufacturing processes, and geometric constraints.

• Consider material selection based on strength, ductility, and cost

• Understand manufacturing processes like bending, stamping, and welding

• Account for geometric constraints like tolerances, assembly requirements, and part functionality