40+ Trainee Design Engineer Interview Questions and Answers

Limits Fit and Tolerances are terms used in engineering to define the acceptable range of dimensions for a part or assembly.

• Limits Fit refers to the relationship between the maximum and minimum size of mating parts.

• Tolerances are the allowable variations in dimensions for a part or assembly.

• Limits Fit and Tolerances ensure proper functionality, interchangeability, and assembly of components.

• Examples of Limits Fit include clearance fit, interference fit, and transition fit.

• Tol...read more

The minimum percentage of steel in a slab depends on various factors such as load, span, and thickness.

• The minimum percentage of steel in a slab is generally 0.15% to 0.2% of the cross-sectional area.

• The percentage of steel may vary depending on the type of slab, such as one-way or two-way slab.

• The thickness of the slab also plays a crucial role in determining the minimum percentage of steel.

• The load and span of the slab also affect the minimum percentage of steel required.

• Th...read more

To make a plastic mould dia, you need to design the mould cavity and core with the desired diameter.

• Design the mould cavity and core with the required diameter

• Consider shrinkage of the plastic material when designing the mould

• Use CAD software to create a 3D model of the mould

• Select the appropriate material for the mould based on the type of plastic being used

Various types of plastic are used in the automotive industry for different purposes.

• Polypropylene (PP) is used for bumpers, dashboards, and interior trims.

• Acrylonitrile Butadiene Styrene (ABS) is used for exterior trims, grills, and wheel covers.

• Polycarbonate (PC) is used for headlights, taillights, and instrument panels.

• Polyurethane (PU) is used for seats, armrests, and headrests.

• Polyethylene (PE) is used for fuel tanks and pipes.

• Polyamide (PA) is used for air intake manifol...read more

A pulley is a simple machine that changes the direction of a force, making it easier to lift heavy objects.

• Used to lift heavy objects by applying less force

• Changes the direction of a force

• Commonly used in elevators, cranes, and exercise machines

Types of plastics used in die design include thermoplastics, thermosets, and elastomers.

• Thermoplastics can be melted and reformed, such as ABS and polyethylene

• Thermosets are set during molding and cannot be remelted, like epoxy and phenolic resins

• Elastomers are flexible and rubber-like, such as silicone and neoprene

Setting a scale for a die involves determining the size and dimensions of the die based on the desired output.

• Understand the specifications and requirements for the die

• Calculate the dimensions and size of the die based on the material and design

• Consider factors such as tolerance, material properties, and production process

• Use CAD software for precise design and measurements

• Test the die with sample materials to ensure accuracy and functionality

Working software is software that is functional, reliable, and meets the requirements of the end users.

• Working software should be able to perform the tasks it was designed for without errors or bugs.

• It should be reliable and consistent in its performance.

• The software should meet the needs and expectations of the end users.

• Regular updates and maintenance should be done to ensure the software remains in working condition.

• Examples: Microsoft Office, Adobe Photoshop, Google Chrom...read more

Types of material and GD&T

• Materials can be classified as metals, polymers, ceramics, and composites

• GD&T stands for Geometric Dimensioning and Tolerancing

• GD&T is a system of symbols and rules used to specify the geometry of mechanical parts

• GD&T helps to ensure that parts are manufactured to the correct size, shape, and orientation

• GD&T includes symbols for features like flatness, parallelism, perpendicularity, and circularity

Manufacturing processes are methods used to create products from raw materials, involving various techniques and machinery.

• Casting: pouring molten material into a mold to create a solid shape (e.g. metal casting)

• Machining: removing material from a workpiece to achieve desired shape and size (e.g. milling, turning)

• Forming: shaping materials using force or pressure (e.g. bending, stamping)

• Joining: combining multiple parts to create a single product (e.g. welding, soldering)

• Addi...read more

Autocad is a software used for creating 2D and 3D drawings for engineering designs.

• Autocad is a popular software used by design engineers for creating precise 2D drawings.

• It also allows for the creation of detailed 3D models for visualization and analysis.

• Autocad offers a wide range of tools for drafting, modeling, and annotation.

• Design engineers use Autocad to create blueprints, schematics, and technical drawings for various projects.

• Proficiency in Autocad is essential for d...read more

Worked as a design intern at XYZ Engineering, where I assisted in creating CAD models and conducting simulations.

• Assisted in creating CAD models for new product designs

• Conducted simulations to test the performance of prototypes

• Collaborated with senior engineers to refine designs based on feedback

An 8-bit counter counts from 0 to 255 in binary, using flip-flops and logic gates for digital applications.

• An 8-bit counter can represent values from 0 (00000000) to 255 (11111111).

• It typically uses 8 flip-flops, each representing one bit.

• Counters can be synchronous (all bits change simultaneously) or asynchronous (bits change in sequence).

• Common applications include digital clocks, frequency counters, and timers.

• Example: A binary counter increments its value on each clock pu...read more

Realisation of gates involves creating logical operations using electronic components like transistors.

• Gates can be realized using various technologies such as CMOS, TTL, or RTL.

• For example, an AND gate can be built using two transistors in series.

• NAND gates are universal gates, meaning they can be used to create any other gate.

• Realization can also be done using software simulations in tools like Logisim.