20+ Aragen Life Sciences Interview Questions and Answers

To prevent plastic defects, design engineers use methods such as mold flow analysis, material selection, gate design optimization, and part geometry considerations.

• Perform mold flow analysis to identify potential issues before production.

• Select the appropriate plastic material based on the requirements of the part.

• Optimize gate design to ensure proper filling and packing of the mold.

• Consider part geometry to minimize stress concentrations and improve overall quality.

• Use desig...read more

Various methods such as injection molding, blow molding, extrusion, and rotational molding are used in plastic manufacturing.

• Injection molding: molten plastic is injected into a mold to create a part

• Blow molding: air pressure is used to expand molten plastic into a mold

• Extrusion: plastic is melted and forced through a die to create a continuous profile

• Rotational molding: powdered plastic is rotated in a mold until it coats the entire surface

Renloyds number is a dimensionless number used in fluid mechanics to characterize the flow of a fluid over a surface.

• Renloyds number is defined as the ratio of inertial forces to viscous forces in a fluid flow.

• It is used to determine the type of flow (laminar or turbulent) that occurs over a surface.

• Renloyds number is calculated using the formula: Re = (ρ * V * L) / μ, where ρ is the density of the fluid, V is the velocity of the fluid, L is a characteristic length, and μ is ...read more

Draft angles are used in plastic to facilitate easy ejection of the molded part from the mold.

• Draft angles help prevent the part from getting stuck in the mold during ejection

• They reduce friction between the part and the mold walls

• Draft angles improve the overall quality and consistency of the molded part

• Common draft angles range from 1 to 3 degrees, depending on the material and design

Design library in SolidWorks is a feature that allows users to store and reuse commonly used parts, features, and assemblies.

• Design library provides easy access to standard components like screws, nuts, bolts, etc.

• Users can drag and drop items from the design library directly into their designs.

• It helps in saving time by reusing pre-designed components instead of creating them from scratch.

• Design library can be customized to include user-specific components and features.

• Examp...read more

The joining of 2 sheet metal processes can be achieved through methods like welding, riveting, adhesive bonding, or clinching.

• Welding: involves melting the edges of the two sheet metals and fusing them together.

• Riveting: involves using metal fasteners to join the two sheet metals together.

• Adhesive bonding: involves using a strong adhesive to bond the two sheet metals together.

• Clinching: involves deforming the edges of the two sheet metals to interlock them together.

Shrinkage in plastic refers to the reduction in size of a plastic part during the cooling process after molding.

• Shrinkage occurs due to the cooling and solidification of the molten plastic material.

• It is important to account for shrinkage when designing molds for plastic parts.

• Factors affecting shrinkage include the type of plastic material, mold temperature, and cooling rate.

• Examples of plastics with high shrinkage include ABS and polystyrene.

• Shrinkage can lead to dimensiona...read more

Root cause analysis is a systematic process of identifying the underlying cause of a problem or issue.

• Root cause analysis helps in understanding the fundamental reason behind a problem.

• It involves investigating the symptoms, identifying potential causes, and determining the primary cause.

• By addressing the root cause, it is possible to prevent the problem from recurring.

• Root cause analysis techniques include 5 Whys, Fishbone diagram, Fault Tree Analysis, etc.

• For example, if a ...read more

Plastic design consideration involves material selection, part geometry, manufacturability, and environmental impact.

• Material selection based on properties like strength, flexibility, and temperature resistance.

• Consideration of part geometry for moldability, assembly, and functionality.

• Ensuring manufacturability by designing for injection molding, extrusion, or other processes.

• Addressing environmental impact by choosing recyclable materials and minimizing waste.

• Testing for du...read more

Stress is the internal resistance of a material to deformation, while pressure is the force exerted on a surface.

• Stress is a measure of the internal forces within a material, while pressure is a measure of the external force applied to a surface.

• Stress is a scalar quantity, while pressure is a vector quantity.

• Stress is typically measured in units of force per unit area (such as N/m^2 or Pa), while pressure is also measured in the same units.

• Stress can cause deformation or cha...read more

Different types of beams include cantilever beams, simply supported beams, fixed beams, and continuous beams.

• Cantilever beams are supported at only one end, with the other end free to move.

• Simply supported beams have supports at both ends, allowing for rotation and movement.

• Fixed beams have both ends fixed, preventing any rotation or movement.

• Continuous beams have more than two supports, creating multiple spans.

Designing a wrench involves determining the size, shape, material, and functionality based on the intended use.

• Identify the purpose of the wrench (e.g. for automotive, plumbing, or construction)

• Determine the appropriate size and shape of the wrench based on the target fasteners

• Select the material for the wrench based on strength and durability requirements

• Consider additional features such as adjustable jaws or ergonomic handles for user comfort

• Create prototypes for testing an...read more

Pressure vessels are designed by considering factors such as material selection, design codes, operating conditions, and safety measures.

• Select appropriate materials based on the intended use and operating conditions

• Follow design codes and standards such as ASME BPVC, EN 13445, and PD 5500

• Consider factors such as pressure, temperature, corrosion, and fatigue

• Incorporate safety measures such as relief valves, rupture disks, and pressure gauges

• Perform stress analysis and simulat...read more

Passive components do not require an external power source to operate, while active components do require an external power source.

• Passive components include resistors, capacitors, inductors, and transformers.

• Active components include transistors, diodes, integrated circuits, and operational amplifiers.

• Passive components do not amplify or control the flow of electrical current, while active components do.

• Passive components are used to store, filter, or dissipate energy, while...read more

Stress-strain diagram shows the relationship between stress (force applied) and strain (resulting deformation) in a material.

• Stress is the force applied to a material, while strain is the resulting deformation.

• The diagram typically shows a linear elastic region, followed by a yield point, plastic deformation, and ultimately failure.

• Materials can exhibit different behaviors on the diagram, such as brittle, ductile, or elastic.

• The slope of the linear region is the Young's Modul...read more

Product design involves several stages from ideation to launch.

• Ideation and research

• Concept development

• Prototyping and testing

• Design for manufacturing

• Launch and post-launch evaluation

Static load is a constant force acting on a structure, while dynamic load is a varying force that changes with time.

• Static load remains constant over time, while dynamic load fluctuates.

• Examples of static load include the weight of a building or a bridge, while examples of dynamic load include wind or earthquake forces.

• Static load is easier to predict and design for, while dynamic load requires more complex analysis and considerations.

• Structures designed for static load may n...read more