10+ Amazon Lab126 Interview Questions and Answers

Injection moulding is a manufacturing process used to produce parts by injecting material into a mould.

• Material is heated and injected into a mould cavity

• The material cools and solidifies, taking the shape of the mould

• Commonly used for producing plastic parts in mass production

• Used in various industries such as automotive, electronics, and consumer goods

Different types of stresses include tensile, compressive, shear, bending, and torsional stress.

• Tensile stress occurs when a material is pulled apart, like stretching a rubber band.

• Compressive stress occurs when a material is pushed together, like squeezing a sponge.

• Shear stress occurs when a material is twisted or cut, like cutting a piece of paper with scissors.

• Bending stress occurs when a material is bent, like bending a piece of wire.

• Torsional stress occurs when a material...read more

Shear stress is the force applied parallel to a surface, causing deformation. Shear strain is the resulting deformation.

• Shear stress is the force applied parallel to a surface, divided by the surface area

• Shear strain is the change in shape or deformation of a material due to shear stress

• Shear stress and strain are important in the design of structures and materials to ensure they can withstand forces

• Example: When a pair of scissors cut through paper, shear stress is applied t...read more

Stress concentration can be reduced by using fillets, chamfers, and blending corners.

• Using fillets and chamfers to smooth out sharp corners

• Blending corners to distribute stress evenly

• Using multiple holes instead of a single hole

• Using a gradual change in cross-section instead of a sudden change

• Using materials with higher ductility

• Using surface treatments like shot peening or grinding

• Avoiding sharp corners and notches

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.

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

• It occurs when there is a sudden change in the shape or size of a component.

• It can lead to premature failure of the material.

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

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

• Finite element analysis can be used to predict and mitigate stress concentration.

CAD software tools are used for designing and drafting in engineering projects.

• CAD software tools are used for creating 2D and 3D models of products or structures.

• Popular CAD software tools include AutoCAD, SolidWorks, and CATIA.

• CAD software tools help engineers visualize and simulate designs before production.

• CAD software tools improve accuracy and efficiency in the design process.

Stress strain diagrams show the relationship between stress and strain in a material.

• Stress strain diagrams help in understanding the behavior of materials under different loading conditions.

• The slope of the stress strain curve represents the material's stiffness or Young's modulus.

• The area under the stress strain curve represents the material's toughness or energy absorption capacity.

• Different materials exhibit different stress strain behaviors, such as brittle, ductile, or ...read more

Manufacturing operations include casting, machining, welding, and assembly.

• Casting involves pouring molten metal into a mold to create a specific shape.

• Machining uses tools to remove material from a workpiece to achieve the desired shape.

• Welding joins two or more pieces of metal together using heat and pressure.

• Assembly involves putting together individual components to create a finished product.