Signify Senior Mechanical Design Engineer Interview Questions and Answers

GD&T is used in mechanical engineering design to specify and control the geometric and dimensional requirements of a product.

• GD&T ensures clear communication between designers, manufacturers, and inspectors.

• It helps to improve the quality and functionality of products.

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

• It allows for precise control of tolerances, ensuring proper fit and a...read more

Defects in plastics refer to imperfections or flaws that affect the quality and performance of plastic materials.

• Sink marks: Depressions or dents on the surface caused by uneven cooling or inadequate material flow.

• Warping: Distortion or bending of the plastic part due to uneven cooling or residual stresses.

• Flash: Excess material that protrudes from the mold joint, caused by poor mold design or excessive injection press...read more

Creo is a CAD software used for mechanical design. It offers various commands for creating, modifying, and analyzing 3D models.

• Sketching: Create 2D sketches using lines, arcs, and other tools.

• Extrude: Convert 2D sketches into 3D models by extruding them.

• Revolve: Create 3D models by revolving 2D sketches around an axis.

• Sweep: Create complex shapes by sweeping a profile along a path.

• Blend: Blend or fillet edges to create...read more

There are several types of diffusers used in mechanical systems.

• The most common types of diffusers are radial, axial, and mixed flow.

• Radial diffusers are used in centrifugal compressors and have a circular cross-section.

• Axial diffusers are used in axial compressors and have a rectangular cross-section.

• Mixed flow diffusers are used in mixed flow compressors and have a combination of circular and rectangular cross-sectio...read more

The distance between sewer line manholes varies depending on the location and terrain.

• The distance between manholes can range from 50 to 400 feet.

• In urban areas, manholes are usually closer together due to the higher concentration of sewage.

• In hilly areas, manholes are placed closer together to account for changes in elevation.

• The distance between manholes can also be affected by the size of the pipe and the flow rate ...read more

We use a variety of materials in mechanical design.

• Metals such as steel, aluminum, and titanium

• Plastics such as ABS, polycarbonate, and nylon

• Composites such as carbon fiber and fiberglass

• Ceramics and glass

• Natural materials such as wood and leather

• Fluids such as hydraulic and pneumatic fluids

• Adhesives and coatings

• Additive manufacturing materials such as PLA and ABS filaments