Servotech Power Systems R&D Engineer Interview Questions and Answers

Traction Motor design, Outline drawings making, fixture making etc.

Q1. Plastic shrinkage?
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Q2. How many types of plastic material category?
Ans. 
There are seven main categories of plastic materials.
• Thermoplastics

• Thermosets

• Elastomers

• Composites

• Biodegradable plastics

• Engineering plastics

• High-performance plastics
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Q3. Plastic rib thickness standard?
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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
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Q4. How many types of defects in plastic?
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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.
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Q1. Diff b/w hot runner & cold runner?
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Q2. How to prevent plastic defects?
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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
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Q3. No. of tonnage molding machine you are used?
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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
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Q4. What is draft angle in plastic?
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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
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Q5. What is parametric modelling?
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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
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Q6. How to solve plastic defects issue in plastic?
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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
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Q7. Cad test on NX Software 2306 version? Plastic parts devlop in cad softwares?
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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
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Q1. Conducting Material varieties
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Q2. Difference between copper busbar and aluminum bar
Ans. 
Copper busbars have higher conductivity and better resistance to corrosion compared to aluminum bars.
• Copper busbars have higher conductivity than aluminum bars.

• Copper busbars have better resistance to corrosion compared to aluminum bars.

• Aluminum bars are lighter and cheaper than copper busbars.

• Aluminum bars are more prone to oxidation compared to copper busbars.
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Q3. Methods of Heat transfer
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Heat transfer methods include conduction, convection, and radiation.
• Conduction: Heat transfer through direct contact between materials (e.g. touching a hot pan)

• Convection: Heat transfer through the movement of fluids (e.g. boiling water)

• Radiation: Heat transfer through electromagnetic waves (e.g. feeling the warmth of the sun)
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Q4. Tolerance stack
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Q5. Types of Material and Various plastic
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Various types of materials and plastics used in engineering applications.
• Common types of materials include metals, polymers, ceramics, and composites

• Plastics are a type of polymer that can be categorized as thermoplastics or thermosets

• Examples of plastics include polyethylene, polystyrene, PVC, and ABS

• Materials selection is crucial in engineering design to ensure desired properties and performance
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Quantitative and qualitative reasoning, electrical and electronics basics

Q1. Projects based , basic electronics concepts
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Q2. Embedded projects related questions
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Q1. Basic electrical theories and principles . Some cable oriented questions and previous company experience.
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