C&S Electric R&D Engineer Interview Questions and Answers

Moment and shear force diagrams are graphical representations of the internal forces acting on a structural element.

• Moment diagram shows the variation of bending moment along the length of the beam.

• Shear force diagram shows the variation of shear force along the length of the beam.

• Both diagrams are essential for designing and analyzing structures.

• They help in determining the maximum bending moment and shear force that ...read more

There are seven main categories of plastic materials.

• Thermoplastics

• Thermosets

• Elastomers

• Composites

• Biodegradable plastics

• Engineering plastics

• High-performance plastics

Plastic rib thickness standard varies depending on the application and material used.

• Plastic rib thickness is typically between 0.5mm to 5mm.

• Thicker ribs provide more strength but may increase material usage and cost.

• Thinner ribs are more cost-effective but may be prone to warping or breaking.

• Consider the material properties and intended use when determining rib thickness.

• Consult industry standards and guidelines for s

There are three main types of defects in plastic: surface defects, physical defects, and chemical defects.

• Surface defects include scratches, sink marks, and flow marks.

• Physical defects include bubbles, voids, and warping.

• Chemical defects include discoloration, degradation, and contamination.

Preventing plastic defects involves proper material selection, design optimization, and quality control measures.

• Selecting the right type of plastic for the application

• Optimizing the design to minimize stress concentrations

• Implementing proper molding techniques and parameters

• Conducting thorough quality control inspections

• Training staff on proper handling and storage of plastic materials

I have experience working with various tonnage molding machines, including 50-ton, 100-ton, and 200-ton machines.

• 50-ton molding machine

• 100-ton molding machine

• 200-ton molding machine

Draft angle in plastic is the degree of taper or slope applied to the vertical walls of a plastic part to facilitate its ejection from the mold.

• Draft angles are typically recommended to be between 1-3 degrees for most plastic parts

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

• Examples of draft angles include adding a slight taper to the sides of a plastic cup or the walls of a plastic

Parametric modelling is a design approach where the model is defined by a set of parameters and rules that govern its shape and size.

• Uses parameters to define the shape and size of the model

• Allows for easy modification of the design by changing parameters

• Enables creation of complex designs with interconnected features

• Commonly used in CAD software like SolidWorks and Autodesk Inventor

Plastic defects can be solved by identifying root causes, adjusting processing parameters, using quality materials, and implementing proper maintenance.

• Identify root causes of defects such as improper molding conditions or poor material quality

• Adjust processing parameters like temperature, pressure, and cooling rate to optimize production

• Use high-quality materials to ensure consistency and durability of the final produ...read more

Yes, CAD tests can be conducted on NX Software 2306 version. Plastic parts can be developed in CAD software.

• CAD tests can be performed on NX Software 2306 version to ensure compatibility and functionality.

• CAD software allows for the design and development of plastic parts with precision and accuracy.

• Features like 3D modeling, simulation, and analysis tools in CAD software aid in the development of plastic parts.

• Example...read more

CT current can be calculated by dividing the primary current by the turns ratio of the current transformer.

• CT current = Primary current / Turns ratio

• Primary current is the current flowing through the primary conductor

• Turns ratio is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding

Lockout is a safety procedure used to ensure that machinery or equipment is properly shut off and cannot be restarted until maintenance or servicing is completed.

• Lockout involves isolating energy sources to prevent accidental startup.

• Lockout devices like padlocks and tags are used to physically lock equipment.

• Lockout procedures must be followed to prevent accidents and injuries.

• Examples of lockout include locking out e...read more

IP65 for panel refers to the level of protection against dust and water ingress.

• IP65 rating means the panel is dust tight and protected against water jets from any direction.

• The first digit '6' indicates the level of protection against solid objects like dust.

• The second digit '5' indicates the level of protection against water ingress.

• Commonly used in outdoor or industrial applications where the panel may be exposed to...read more

TCS and Master Trip Relay are protective devices used in electrical systems to prevent damage during faults.

• TCS stands for Time Current Characteristic Relay, which operates based on the relationship between time and current to trip the circuit breaker during faults.

• Master Trip Relay is a relay that receives signals from various protective relays and initiates a trip signal to disconnect the circuit in case of a fault.

• B...read more

LSC 2A and LSC 2B are standards for lighting in commercial and industrial buildings.

• LSC 2A and LSC 2B are part of the Lighting Power Density (LPD) requirements in building codes.

• LSC 2A is for commercial buildings while LSC 2B is for industrial buildings.

• They specify the maximum allowable power consumption for lighting per unit area in a building.

• For example, LSC 2A may require a maximum LPD of 0.9 watts per square foot

REF protection is used to prevent damage to equipment from electrical faults. High impedance protection is used for sensitive equipment, while low impedance protection is used for power systems.

• REF protection is used to detect ground faults and prevent damage to equipment.

• High impedance protection is used for sensitive equipment that requires high accuracy and low fault currents.

• Low impedance protection is used for pow...read more

ANSI codes are used to identify various types of protection devices in electrical systems.

• ANSI code 50/51 is for instantaneous overcurrent protection

• ANSI code 67 is for directional power protection

• ANSI code 87 is for differential protection

• ANSI code 59 is for overvoltage protection

Design engineers must adhere to applicable standards to ensure quality and safety of products.

• Design engineers should be familiar with industry-specific standards such as ISO 9001, ASME Y14.5, and ASTM.

• Adherence to standards ensures product quality, safety, and compliance with regulations.

• Standards may vary depending on the industry and type of product being designed.

• Regular updates and training on new standards are es