Mechanical Engg. Design
200+ Mechanical Engg. Design Interview Questions and Answers
Q51. What are the symbols used in Geometric Dimensioning and Tolerancing (GD&T)?
Symbols used in GD&T include position, concentricity, perpendicularity, etc.
Position symbol: Indicates the allowable deviation from the true position of a feature
Concentricity symbol: Specifies the allowable deviation between the axis of two features
Perpendicularity symbol: Indicates the allowable deviation from a 90-degree angle between two features
Q52. what are the different types of leaning techniques in machine learning
Different types of leaning techniques in machine learning
Supervised learning
Unsupervised learning
Semi-supervised learning
Reinforcement learning
Transfer learning
Deep learning
Online learning
Active learning
Q53. Please draw about a system that consists of mechanical parts or mechanisms and having 3 or more degrees of freedom and explain its working
A robotic arm with 6 degrees of freedom for precise movements in multiple directions.
Robotic arm with 6 degrees of freedom allows for movement in multiple directions
Each joint of the arm provides a degree of freedom for precise control
Commonly used in manufacturing, medical surgeries, and space exploration
Q54. What's stress and strain?
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 in response to stress.
Stress is typically measured in units of force per unit area (such as Pascals), while strain is dimensionless.
The relationship between stress and strain is described by the material's modulus of ela...read more
Q55. How do you define the requirements for a design?
Requirements for a design are defined by understanding the problem, identifying constraints, and setting goals.
Understand the problem that needs to be solved
Identify any constraints such as budget, time, or materials
Set goals for the design such as performance or efficiency
Consider user needs and preferences
Collaborate with stakeholders to ensure all requirements are met
Q56. What are welding symbols and their significance in engineering drawings?
Welding symbols are graphical representations used in engineering drawings to communicate welding information.
Welding symbols indicate the type of weld, dimensions, and other important information related to the welding process.
They help in specifying the welding requirements without the need for lengthy written explanations.
Common welding symbols include fillet weld, groove weld, plug weld, spot weld, etc.
Examples of welding symbols are 'F' for fillet weld, 'V' for groove we...read more
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Q57. How can you integrate SolidWorks with other software applications?
SolidWorks can be integrated with other software applications through various methods.
Use API to connect SolidWorks with other software for data exchange
Utilize plugins or add-ons to enhance functionality
Export/import files in compatible formats like STEP, IGES, or STL
Collaborate with cloud-based platforms for seamless integration
Utilize PDM systems for managing design data across multiple software applications
Q58. What is the capacity of diesel and petrol
Diesel has higher energy density than petrol, resulting in better fuel efficiency.
Diesel has a higher energy density than petrol, meaning it can provide more energy per unit volume.
Petrol is more volatile and burns faster than diesel.
The capacity of diesel and petrol tanks in vehicles can vary depending on the size of the vehicle and its fuel efficiency.
For example, a typical car may have a petrol tank capacity of around 50-70 liters, while a diesel car may have a tank capaci...read more
Mechanical Engg. Design Jobs
Q59. Are you able to make documentations ?
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
Q60. Rubber properties and measuring parameters and devices.
Rubber properties can be measured using various parameters and devices.
Rubber properties include elasticity, tensile strength, hardness, and compression set.
Parameters used to measure rubber properties include stress, strain, and deformation.
Devices used to measure rubber properties include rheometers, durometers, and tensile testers.
Rubber properties can also be measured using thermal analysis and dynamic mechanical analysis.
Measuring rubber properties is important for ensur...read more
Q61. Do you know th heat treatment process of steel ?
Heat treatment of steel involves heating and cooling to alter its properties.
Heat treatment is used to improve the strength, hardness, and ductility of steel.
Common heat treatment processes include annealing, quenching, and tempering.
Annealing involves heating the steel to a specific temperature and then slowly cooling it to make it softer and more ductile.
Quenching involves rapidly cooling the steel to increase its hardness.
Tempering involves heating the steel to a specific ...read more
Q62. 2. How to calculate air requirement for combustion..?
Air requirement for combustion can be calculated using stoichiometry and fuel properties.
Determine the stoichiometric air-to-fuel ratio
Determine the fuel properties such as heating value and molecular weight
Calculate the mass flow rate of fuel
Calculate the mass flow rate of air using the stoichiometric ratio
Adjust for excess air if necessary
Q63. How much you rate for Autodesk Inventor
I rate Autodesk Inventor highly for its user-friendly interface and powerful design capabilities.
Autodesk Inventor is a versatile software that allows for efficient 3D modeling and simulation.
It offers a wide range of tools and features that make the design process easier and more streamlined.
The software's user-friendly interface makes it easy to learn and use, even for beginners.
Autodesk Inventor also integrates well with other software, such as AutoCAD and Revit.
Overall, I...read more
Q64. what is Fit? What is Material Properties of IS2062 E250 ? Why we not makes Drawing in 2nd or Third Angle ?
Answering questions related to mechanical engineering design.
Fit refers to the degree of tightness between two mating parts.
IS2062 E250 is a mild steel grade with properties such as high tensile strength and good ductility.
Drawing in first angle projection is preferred as it is more intuitive and easier to understand.
Second and third angle projections are used in rare cases where first angle projection is not feasible.
Q65. What is your Software proficiency ??
I am proficient in various software including CAD, CAM, and simulation software.
Proficient in CAD software such as SolidWorks, AutoCAD, and CATIA
Experience in CAM software like Mastercam and Fusion 360
Familiarity with simulation software such as ANSYS and COMSOL
Proficient in programming languages like Python and MATLAB for automation and analysis
Experience in project management software like MS Project and Asana
Q66. What is the distance between spot to spot and flang over lap
Distance between spot to spot and flange overlap is crucial for ensuring proper alignment and connection in mechanical engineering design.
The distance between spot to spot refers to the spacing between two spot welds or fasteners on a joint.
Flange overlap distance is the amount by which one flange overlaps another in a joint, ensuring proper connection and strength.
Proper calculation of these distances is essential for structural integrity and load-bearing capacity of the des...read more
Q67. What is difference between ferrous and non-ferrous material?
Ferrous materials contain iron while non-ferrous materials do not.
Ferrous materials are magnetic while non-ferrous materials are not.
Ferrous materials are prone to rust while non-ferrous materials are not.
Examples of ferrous materials include steel and cast iron while examples of non-ferrous materials include aluminum and copper.
Q68. What should be the minimum gap between two nested pieces of sheet
The minimum gap between two nested pieces of sheet depends on the thickness of the sheet and the manufacturing process.
The gap should be at least equal to the thickness of the sheet
The manufacturing process and material properties can affect the required gap
Consult industry standards and guidelines for specific recommendations
Examples: for 0.5mm sheet metal, the minimum gap should be 0.5mm; for laser cutting, the gap may need to be slightly larger to account for the heat affe...read more
Q69. What is shaft basis and hole basis system?
Shaft basis and hole basis are two systems used to determine the tolerance limits of mating parts in mechanical design.
Shaft basis system: The shaft is kept constant and the hole is varied to achieve the desired fit.
Hole basis system: The hole is kept constant and the shaft is varied to achieve the desired fit.
The system chosen depends on the application and the desired level of clearance or interference between the mating parts.
Examples of applications include bearings, gear...read more
Q70. What are the various types of beams?
There are several types of beams including cantilever, simply supported, fixed, continuous, and overhanging beams.
Cantilever beams are supported at one end and free at the other.
Simply supported beams are supported at both ends and have no moment resistance.
Fixed beams are supported at both ends and have moment resistance.
Continuous beams have more than two supports and can resist bending moments.
Overhanging beams have one or both ends extending beyond the supports.
Q71. What was your prior experience qith design softwares?
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
Q72. What is sheet metal and compare Stainless steel , mild steel
Sheet metal is a thin and flat metal material used in various industries for manufacturing components and structures.
Sheet metal is a thin and flat metal material that can be easily bent, cut, and formed into various shapes.
Stainless steel is a type of steel that contains chromium, which makes it resistant to corrosion and rust. It is commonly used in applications where corrosion resistance is important, such as in kitchen appliances and automotive parts.
Mild steel, on the ot...read more
Q73. Show a typical manufacturing drawing template with necessary details.
A manufacturing drawing template typically includes details such as dimensions, tolerances, materials, and finishing.
Title block with part name, drawing number, and revision
List of materials and their specifications
Detailed views with dimensions and tolerances
Bill of materials with part numbers and quantities
Notes section for additional information
Finishing requirements such as surface roughness and coatings
Reference to applicable standards and specifications
Q74. What's the purpose of adding hem in sheetmetal design?
Hem is added in sheetmetal design to provide strength and safety to the edges.
Hemming is a process of folding the edge of a sheet metal to create a smooth and safe edge.
It provides additional strength to the edge and prevents it from getting damaged or deformed.
Hemming also improves the appearance of the sheet metal and makes it more aesthetically pleasing.
Examples of hemming include the edges of car doors, hoods, and trunks.
Hemming can be done using various techniques such a...read more
Q75. AutoCAD 2D hand's on experience is must for drafting ?
Yes, AutoCAD 2D hands-on experience is essential for drafting.
AutoCAD is a widely used software for drafting in mechanical engineering.
2D drafting is the foundation of engineering design.
Hands-on experience with AutoCAD 2D helps in creating accurate and efficient designs.
It also helps in understanding the various tools and features of the software.
Without hands-on experience, it may lead to errors and inefficiencies in the design process.
Q76. What is the surface roughness value of the conveyor roller?
The surface roughness value of the conveyor roller depends on the application and material used.
Surface roughness value is measured in micrometers (µm).
The value can range from 0.1 µm to 50 µm depending on the application.
The material used for the roller also affects the surface roughness value.
A smoother surface reduces friction and wear on the conveyor belt.
Surface roughness can be improved through polishing or coating.
ISO 4287 and ISO 4288 are standards used to measure sur...read more
Q77. Can you work on AutoCAD 2D ?
Yes, I have extensive experience working on AutoCAD 2D.
I have used AutoCAD 2D for various projects in my previous job.
I am proficient in creating and editing 2D drawings using AutoCAD.
I am familiar with the various tools and commands in AutoCAD 2D.
I can work on both simple and complex drawings using AutoCAD 2D.
I am open to learning new techniques and improving my skills in AutoCAD 2D.
Q78. What are constraints in design?
Constraints in design are limitations or restrictions that affect the design process and final product.
Constraints can be related to materials, manufacturing processes, budget, time, or regulations.
They can also be imposed by the client or end-user requirements.
Examples of constraints include weight limitations for aerospace components, cost limitations for consumer products, and safety regulations for medical devices.
Designers must work within these constraints to create a f...read more
Q79. Freehand sketch of mechanical components, after taking measurement by using Vernier Caliper.
To sketch mechanical components, measure with Vernier Caliper and draw freehand sketch.
Take accurate measurements using Vernier Caliper
Use a pencil and paper to sketch the components
Draw the components to scale
Label the components with their dimensions
Check the sketch for accuracy and completeness
Q80. How to calculate Shear stress of the shaft
Shear stress of a shaft can be calculated using the formula T/J = τ/R
Calculate torque (T) applied to the shaft
Determine the polar moment of inertia (J) of the shaft's cross-sectional area
Find the radius (R) of the shaft
Use the formula T/J = τ/R to calculate the shear stress (τ) of the shaft
Shear stress can also be calculated using the maximum shear stress formula τmax = Tc/J
Where Tc is the torsional stress at the outer surface of the shaft
Q81. How to calculate torsion strength of the shaft
Torsion strength of a shaft can be calculated using the formula T/J=Gθ/L
T is the torque applied to the shaft
J is the polar moment of inertia of the shaft
G is the shear modulus of the material of the shaft
θ is the angle of twist
L is the length of the shaft
Example: For a solid circular shaft, J=πd^4/32 where d is the diameter of the shaft
Q82. What are the different types of metal joints?
Different types of metal joints include welded joints, bolted joints, riveted joints, soldered joints, and adhesive joints.
Welded joints involve melting and fusing the metal pieces together.
Bolted joints use bolts and nuts to secure the metal pieces together.
Riveted joints use rivets to hold the metal pieces together.
Soldered joints involve melting a filler metal to join the pieces together.
Adhesive joints use adhesives to bond the metal pieces together.
Q83. What are the various manufacturing processes?
Various manufacturing processes include casting, machining, welding, forming, and additive manufacturing.
Casting: involves pouring molten metal into a mold to create a desired shape (e.g. sand casting, die casting)
Machining: involves removing material from a workpiece using cutting tools (e.g. milling, turning)
Welding: involves joining two or more pieces of metal together using heat and/or pressure (e.g. arc welding, spot welding)
Forming: involves shaping a material without r...read more
Q84. What are the various surface treatment processes?
Surface treatment processes are used to improve the properties of a material's surface for various applications.
Coating: Applying a thin layer of material to the surface for protection or aesthetic purposes (e.g. painting, anodizing).
Plating: Depositing a layer of metal onto the surface for corrosion resistance or improved appearance (e.g. electroplating, galvanizing).
Heat treatment: Altering the material's properties through heating and cooling processes (e.g. annealing, que...read more
Q85. What CAD softwares are you familliar with?
I am familiar with CAD softwares such as SolidWorks, AutoCAD, and CATIA.
SolidWorks
AutoCAD
CATIA
Q86. Bending Allowance for the Sheet metal products
Bending allowance is the amount of added length required on a sheet metal product to compensate for the material's elasticity during bending.
Bending allowance is calculated based on the material's thickness, bend radius, and angle of bend.
It ensures that the final product has the desired dimensions after bending.
Bending allowance varies for different materials and bending processes.
For example, the bending allowance for aluminum is different from that of steel.
Bending allowan...read more
Q87. How to determine the busbar size and material?
Busbar size and material are determined based on current carrying capacity, voltage drop, and mechanical strength requirements.
Calculate the maximum current the busbar will carry
Determine the voltage drop allowed
Consider the mechanical strength required based on installation conditions
Select a material with appropriate conductivity and mechanical properties
Consult relevant standards and guidelines for busbar sizing and material selection
Q88. Hows your design approval process approach?
My design approval process approach involves thorough analysis, documentation, and collaboration with stakeholders.
I conduct a detailed analysis of the design to ensure it meets all requirements and standards.
I document the design process and decisions made throughout the project.
I collaborate with stakeholders, including clients and team members, to gather feedback and ensure their needs are met.
I conduct regular design reviews to identify and address any issues or concerns....read more
Q89. What is k factor in sheet metal?
K factor is a ratio that represents the location of the neutral axis in relation to the thickness of the sheet metal.
K factor is used in sheet metal bending to determine the amount of bending force required.
It is a ratio of the distance from the neutral axis to the inside bend radius over the material thickness.
Different materials and bending processes have different k factors.
K factor affects the accuracy of the flat pattern layout and the final part dimensions.
Typical k fac...read more
Q90. How to create a thread 20x1.5 in a 2mm sheet..
To create a thread 20x1.5 in a 2mm sheet, use a tap and die set with the appropriate size and pitch.
Select a tap and die set with a 20x1.5 size and pitch
Drill a hole in the 2mm sheet with a diameter slightly smaller than the tap size
Insert the tap into the hole and turn it clockwise to create the thread
Use the die to clean up and refine the thread
Ensure the thread is the correct size and pitch using a thread gauge
Q91. what are the different types of design process
There are three types of design process: linear, parallel, and iterative.
Linear design process involves a step-by-step approach from concept to final product.
Parallel design process involves multiple teams working on different aspects of the design simultaneously.
Iterative design process involves continuous testing and refinement of the design.
Examples of linear design process include waterfall model and V-model.
Examples of parallel design process include concurrent engineeri...read more
Q92. Which type of prjects you handeled?
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
Q93. What is top down and bottom up assembly??
Top down assembly is creating an assembly by starting with the top-level components and working down. Bottom up assembly is the opposite.
Top down assembly involves starting with the highest level components and working down to the smaller parts.
Bottom up assembly involves starting with the smaller parts and building up to the higher level components.
Top down assembly is useful when designing complex systems with many sub-assemblies.
Bottom up assembly is useful when designing ...read more
Q94. Sheet metal process, give model to design on ugnx
Sheet metal process involves designing a model on ugnx.
Sheet metal process involves shaping and forming thin metal sheets.
Designing on ugnx refers to using the Unigraphics NX software for creating the model.
The model should consider factors like material thickness, bend radius, and manufacturing constraints.
Examples of sheet metal designs include enclosures, brackets, and automotive body panels.
Q95. How string are you in Gearbox?
I am very strong in Gearbox design and have extensive experience in designing and optimizing gear systems.
I have a deep understanding of gear geometry, materials, and manufacturing processes.
I have designed gearboxes for various applications including automotive, aerospace, and industrial machinery.
I am proficient in using software tools such as SolidWorks, ANSYS, and MATLAB for gearbox design and analysis.
I have worked on projects involving gear noise reduction, efficiency i...read more
Q96. What are the type of sections
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
Q97. Tool test for modeling in NX CAD
Tool test is a process to evaluate the performance of modeling tools in NX CAD.
Tool test involves creating a test model and evaluating the accuracy and efficiency of the modeling tools.
The test model should include a variety of features and geometries to test the capabilities of the tools.
The test should be repeated with different tool settings and parameters to evaluate their impact on the results.
The results of the tool test should be documented and used to inform tool sele...read more
Q98. What is GDT? name three common GDT call outs
GDT stands for Geometric Dimensioning and Tolerancing. Three common GDT call outs are concentricity, perpendicularity, and flatness.
Concentricity: Specifies that two or more features share a common center point.
Perpendicularity: Specifies that a surface or axis is perpendicular to a datum plane.
Flatness: Specifies that a surface must lie within a specified flatness tolerance zone.
Q99. What is heat treatment process?
Heat treatment is a process of heating and cooling metals to alter their physical and mechanical properties.
Heat treatment is used to improve the hardness, strength, toughness, and ductility of metals.
It involves heating the metal to a specific temperature and holding it there for a certain amount of time.
The metal is then cooled at a specific rate to achieve the desired properties.
Common heat treatment processes include annealing, quenching, tempering, and normalizing.
Exampl...read more
Q100. How strong are you in NX CAD?
I am proficient in NX CAD and have extensive experience in using it for mechanical design.
I have completed multiple projects using NX CAD for designing mechanical components and assemblies.
I am well-versed in creating 3D models, assemblies, and drawings using NX CAD.
I have a strong understanding of the software's features and capabilities, including simulation and analysis tools.
I am constantly learning and improving my skills in NX CAD to stay up-to-date with the latest adva...read more
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