30+ CAD Engg Interview Questions and Answers

Super elevation is the banking of a road's outer edge to counteract the effects of centrifugal force on vehicles during turns.

• Super elevation is the tilt or slope provided to the outer edge of a road or track on a curve.

• It helps vehicles to navigate turns at higher speeds by counteracting the tendency to skid outwards.

• The amount of super elevation required depends on factors like design speed, curve radius, and friction between tires and road surface.

• Excessive super elevation...read more

Designed a 3D model for a customized machine part

• Received a request from the production team for a unique machine part

• Analyzed the requirements and constraints of the part

• Used CAD software to design a 3D model of the part

• Collaborated with the production team to ensure the design met their needs

• Made necessary adjustments to the design based on feedback

• Finalized the design and sent it for production

Construction joints are used to separate different pours of concrete, while expansion joints allow for movement due to temperature changes.

• Construction joints are used to separate different sections of concrete that are poured at different times.

• Expansion joints are designed to allow for movement in the concrete due to temperature changes, preventing cracking.

• Construction joints are typically planned and intentional, while expansion joints are necessary for the structural int...read more

Understanding the area and volume calculations of different shapes is essential for CAD engineers.

• Area of a rectangle = length x width

• Area of a circle = π x (radius)^2

• Volume of a cube = side^3

• Volume of a sphere = (4/3) x π x (radius)^3

• Understanding the formulas for different shapes helps in accurate CAD modeling

Manufacturing processes are methods used to transform raw materials into finished products.

• Casting

• Machining

• Forming

• Joining

• Additive manufacturing

• Subtractive manufacturing

• Powder metallurgy

• Injection molding

• Extrusion

• Forging

The symbol used to represent a machine is a rectangle with rounded corners.

• Rectangle with rounded corners

• May include additional details like gears or levers depending on the context

My first engineering design was a simple wooden toy car.

• I designed and built a wooden car using basic tools and materials.

• The car had four wheels, a body, and a steering mechanism.

• I learned about measurements, angles, and basic engineering principles.

• The design was inspired by my love for cars and my desire to create something with my hands.

The most important engineering skill is problem-solving.

• Ability to identify and analyze problems

• Developing and implementing effective solutions

• Critical thinking and decision-making

• Creativity and innovation

• Collaboration and communication

• Attention to detail and accuracy

• Continuous learning and improvement

• Examples: designing a more efficient machine, improving a manufacturing process, solving a structural issue in a building

Different types of junctions include T-junctions, Y-junctions, and cross-junctions.

• T-junctions: Three roads meet at a T-shaped intersection.

• Y-junctions: Three roads meet at a Y-shaped intersection.

• Cross-junctions: Four roads meet at a cross-shaped intersection.

I am proficient in AutoCAD, SolidWorks, CATIA, and Fusion 360.

• AutoCAD

• SolidWorks

• CATIA

• Fusion 360

First angle and third angle projections are two methods used in engineering drawings to represent a three-dimensional object on a two-dimensional plane.

• First angle projection is commonly used in Europe and Asia, where the object is imagined to be in the first quadrant of the coordinate system.

• In first angle projection, the object is placed in front of the viewing plane and the orthographic views are projected onto the planes of projection.

• Third angle projection is commonly us...read more

Switchvation is a critical situation where a switch in design or process is necessary to overcome a problem.

• Identify the root cause of the issue that requires the switch.

• Evaluate the impact of the switch on the overall design or process.

• Communicate with stakeholders about the need for the switch and the potential benefits.

• Implement the switch carefully, ensuring minimal disruption to the project.

• Monitor the effects of the switch and make adjustments as needed.

The MSP 33% rule refers to the Medicare Secondary Payer rule which requires certain entities to pay primary insurance before Medicare pays.

• There are two types of MSP: Conditional Payment MSP and Medicare Advantage MSP.

• Conditional Payment MSP occurs when Medicare makes a conditional payment for services that another payer should have paid.

• Medicare Advantage MSP occurs when a Medicare Advantage plan is the primary payer instead of traditional Medicare.

• Entities subject to the MS...read more

Newton's laws of motion describe the relationship between an object and the forces acting on it.

• First law (Law of Inertia) - An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

• Second law (Law of Acceleration) - The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

• Third law (Law of Action and Reaction) - For every action, there is an equal and opp...read more

Types of pumps include centrifugal pumps, reciprocating pumps, diaphragm pumps, and gear pumps.

• Centrifugal pumps: use rotating impeller to increase fluid velocity and pressure

• Reciprocating pumps: use piston or diaphragm to displace fluid

• Diaphragm pumps: use diaphragm to create pressure and move fluid

• Gear pumps: use interlocking gears to move fluid

Machining processes are used to remove material from a workpiece to create a desired shape or size.

• Turning

• Milling

• Drilling

• Grinding

• Broaching

• Sawing

• Electrical Discharge Machining (EDM)

• Laser Cutting

Stress concentration is the phenomenon of localized stress in a material due to the presence of a geometric feature or a change in shape.

• It occurs when there is a sudden change in the shape or geometry of a material.

• It can lead to material failure or fracture.

• Examples include sharp corners, holes, notches, and cracks.

• It can be reduced by using fillets, chamfers, or other design modifications.

• It is important to consider stress concentration in engineering design to ensure the ...read more

Thermodynamic laws govern energy transfer and transformation in engineering systems.

• First Law: Energy cannot be created or destroyed, only transferred or transformed.

• Second Law: Entropy of a closed system always increases over time.

• Third Law: As temperature approaches absolute zero, the entropy of a system approaches a minimum value.

• Examples: Heat engines, refrigerators, air conditioning systems.

Approach the client by understanding their needs, building rapport, and offering solutions.

• Research the client's background and needs before the meeting.

• Listen actively to the client's requirements and concerns.

• Communicate clearly and confidently about your services and expertise.

• Offer tailored solutions that address the client's specific needs.

• Follow up with the client to ensure satisfaction and maintain a good relationship.

GD&T symbols are used for specifying geometric tolerances on engineering drawings.

• GD&T symbols include position, concentricity, perpendicularity, parallelism, etc.

• Examples: Ø for diameter, ⌀ for circular runout, ⊥ for perpendicularity

• GD&T symbols help communicate design intent and ensure parts are manufactured correctly.

Stress concentration is the phenomenon of increased stress at a localized point in a material.

• Occurs when there is a change in geometry or material properties

• Can lead to material failure or fracture

• Common examples include sharp corners, holes, and notches

• Can be reduced through design modifications or material selection

CAD modeling involves creating digital representations of physical objects using specialized software.

• Start by creating a sketch of the part in 2D

• Extrude the sketch to create a 3D model

• Add details such as fillets, chamfers, and holes

• Check for any errors or interferences in the model

• Export the model in the desired file format

Pumps and valves are essential components in fluid systems for controlling flow and pressure.

• Pumps are used to move fluids from one place to another, creating flow and pressure.

• Valves are used to control the flow and pressure of fluids by opening and closing passages.

• Examples of pumps include centrifugal pumps, diaphragm pumps, and gear pumps.

• Examples of valves include ball valves, gate valves, and butterfly valves.

GD&T stands for Geometric Dimensioning and Tolerancing. It is a system used to define and communicate engineering tolerances.

• GD&T is a language used to communicate design intent and ensure parts are manufactured to the correct specifications.

• It uses symbols and annotations to specify the allowable variation in form, orientation, and location of features on a part.

• GD&T is commonly used in industries such as aerospace, automotive, and manufacturing.

• Examples of GD&T symbols incl...read more

Various manufacturing methods are used for plastics, including injection molding, blow molding, extrusion, and thermoforming.

• Injection molding involves injecting molten plastic into a mold to create a specific shape.

• Blow molding is used to create hollow plastic parts by blowing air into a heated plastic tube.

• Extrusion involves forcing molten plastic through a die to create a continuous profile.

• Thermoforming uses heat to shape plastic sheets into specific forms.

• Other methods i...read more

Manufacturing processes are methods used to transform raw materials into finished products.

• Casting

• Machining

• Forming

• Joining

• Additive manufacturing

Yes, I have experience with other CAD tools.

• I have experience with AutoCAD, SolidWorks, and CATIA.

• I am proficient in creating 2D and 3D models using these tools.

• I have used AutoCAD for architectural drafting and SolidWorks for mechanical design.

• I am familiar with CATIA's advanced surfacing and assembly design capabilities.

Drawing an AutoCAD plan involves creating a detailed layout of a project using the AutoCAD software.

• Start by setting up the drawing environment with appropriate units and scale.

• Create accurate geometric shapes and lines using tools like lines, circles, and rectangles.

• Add dimensions, text, and annotations to provide clarity and information.

• Use layers to organize different elements of the plan.

• Check for accuracy and make any necessary adjustments before finalizing the plan.

Machining is a process of removing material from a workpiece to create a desired shape and size.

• Turning

• Milling

• Drilling

• Grinding

• Broaching

• Sawing

• Electrical Discharge Machining (EDM)

• Laser Cutting

Close volume with features refers to creating a solid object by combining multiple features in CAD software.

• Features can include extrusions, cuts, fillets, and chamfers.

• The goal is to create a closed volume that can be 3D printed or used in simulations.

• The order in which features are created can affect the final result.

• CAD software like SolidWorks and Fusion 360 have tools to help with creating closed volumes.