NKT Operations Design Engineer Interview Questions and Answers for Experienced

Q1. Plastic defects?
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Q2. What is molding?
Ans. 
Molding is a manufacturing process where a liquid or pliable material is poured into a mold to create a specific shape.
• Molding involves heating a material until it becomes pliable, then shaping it using a mold.

• Common types of molding include injection molding, blow molding, and compression molding.

• Examples of molded products include plastic bottles, car parts, and toys.
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Q3. Plastic prevention?
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Q4. How to devloped plastic parts? what method are used?
Ans. 
Plastic parts are developed using methods like injection molding, blow molding, and thermoforming.
• Injection molding is a common method where molten plastic is injected into a mold.

• Blow molding is used for hollow parts like bottles, where plastic is blown into a mold.

• Thermoforming involves heating a plastic sheet and shaping it over a mold.

• Other methods include rotational molding, extrusion, and compression molding.
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Q5. What is shrinkage in plastic?
Ans. 
Shrinkage in plastic refers to the reduction in size of a plastic part after it has been molded.
• Shrinkage occurs as the plastic cools and solidifies after being injected into a mold.

• It is important to account for shrinkage when designing molds and parts to ensure proper dimensions.

• Factors affecting shrinkage include material type, mold temperature, cooling rate, and part geometry.

• Common methods to compensate for shrink...read more
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Q1. What is work of npd in industry?
Ans. 
NPD in industry refers to New Product Development, which involves the process of designing, creating, and bringing new products to market.
• NPD involves identifying market opportunities and customer needs

• It includes concept development, design, prototyping, testing, and commercialization

• NPD teams often collaborate with various departments such as marketing, engineering, and manufacturing

• Successful NPD can lead to increas...read more
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Q2. How to calculate costing of complete products?
Ans. 
Costing of complete products can be calculated by considering materials, labor, overhead, and profit margin.
• Calculate the cost of materials required for the product

• Estimate the labor costs involved in manufacturing the product

• Factor in overhead costs such as utilities, rent, and equipment depreciation

• Add a profit margin to cover additional expenses and generate profit

• Consider any additional costs such as shipping, pack...read more
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Q3. What is gate & runner in molding? &
Ans. 
Gate & runner in molding are channels through which molten material is injected into the mold cavity.
• Gate is the opening through which molten material enters the mold cavity

• Runner is the channel that connects the gate to the sprue or main injection point

• Proper design of gates and runners is crucial for ensuring even distribution of material and preventing defects

• Examples: Submarine gate, edge gate, hot runner system
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Q4. What is the purpose of gate & runner in molding?
Ans. 
The purpose of gate & runner in molding is to control the flow of molten material into the mold cavity.
• Gate controls the flow of molten material into the mold cavity

• Runner distributes the molten material throughout the mold

• They help in achieving proper filling of the mold and reducing defects like air pockets or incomplete filling

• Different types of gates and runners are used based on the molding process and material be
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Q5. Cad test: NX Software version 12
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Questions from general knowledge apti

Q1. Technical questions related to work and study
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Q1. Technical+ Aptitude+software all concluded in this round
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Q1. Salary discussion, company details etc
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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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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. Plastic defects?
Add your answer
Q2. What is molding?
Ans. 
Molding is a manufacturing process where a liquid or pliable material is poured into a mold to create a specific shape.
• Molding involves heating a material until it becomes pliable, then shaping it using a mold.

• Common types of molding include injection molding, blow molding, and compression molding.

• Examples of molded products include plastic bottles, car parts, and toys.
Answered by AI
Add your answer
Q3. Plastic prevention?
Add your answer
Q4. How to devloped plastic parts? what method are used?
Ans. 
Plastic parts are developed using methods like injection molding, blow molding, and thermoforming.
• Injection molding is a common method where molten plastic is injected into a mold.

• Blow molding is used for hollow parts like bottles, where plastic is blown into a mold.

• Thermoforming involves heating a plastic sheet and shaping it over a mold.

• Other methods include rotational molding, extrusion, and compression molding.
Answered by AI
Add your answer
Q5. What is shrinkage in plastic?
Ans. 
Shrinkage in plastic refers to the reduction in size of a plastic part after it has been molded.
• Shrinkage occurs as the plastic cools and solidifies after being injected into a mold.

• It is important to account for shrinkage when designing molds and parts to ensure proper dimensions.

• Factors affecting shrinkage include material type, mold temperature, cooling rate, and part geometry.

• Common methods to compensate for shrink...read more
Answered by AI
Add your answer

Q1. What is work of npd in industry?
Ans. 
NPD in industry refers to New Product Development, which involves the process of designing, creating, and bringing new products to market.
• NPD involves identifying market opportunities and customer needs

• It includes concept development, design, prototyping, testing, and commercialization

• NPD teams often collaborate with various departments such as marketing, engineering, and manufacturing

• Successful NPD can lead to increas...read more
Answered by AI
Add your answer
Q2. How to calculate costing of complete products?
Ans. 
Costing of complete products can be calculated by considering materials, labor, overhead, and profit margin.
• Calculate the cost of materials required for the product

• Estimate the labor costs involved in manufacturing the product

• Factor in overhead costs such as utilities, rent, and equipment depreciation

• Add a profit margin to cover additional expenses and generate profit

• Consider any additional costs such as shipping, pack...read more
Answered by AI
Add your answer
Q3. What is gate & runner in molding? &
Ans. 
Gate & runner in molding are channels through which molten material is injected into the mold cavity.
• Gate is the opening through which molten material enters the mold cavity

• Runner is the channel that connects the gate to the sprue or main injection point

• Proper design of gates and runners is crucial for ensuring even distribution of material and preventing defects

• Examples: Submarine gate, edge gate, hot runner system
Answered by AI
Add your answer
Q4. What is the purpose of gate & runner in molding?
Ans. 
The purpose of gate & runner in molding is to control the flow of molten material into the mold cavity.
• Gate controls the flow of molten material into the mold cavity

• Runner distributes the molten material throughout the mold

• They help in achieving proper filling of the mold and reducing defects like air pockets or incomplete filling

• Different types of gates and runners are used based on the molding process and material be
Answered by AI
Add your answer
Q5. Cad test: NX Software version 12
Add your answer

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
Ans. 
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
Ans. 
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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