Bharat Bijlee Assistant Manager Design Interview Questions and Answers

Q1. Generators topic study well BL Theraja book and basics .
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Q2. What is generator ?
Ans. 
A generator is a device that converts mechanical energy into electrical energy.
• Generators use electromagnetic induction to generate electricity

• They are commonly used in power plants, homes, and businesses

• Examples include diesel generators, wind turbines, and hydroelectric generators
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Q3. Operating principle
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Operating principle refers to the fundamental concept or theory behind how a system or device functions.
• It explains the basic idea or mechanism that drives the operation of a design.

• Understanding the operating principle is crucial for designing and troubleshooting.

• Examples include the operating principle of a heat exchanger, a hydraulic system, or a circuit board.
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Q4. Which IEC standard
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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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Not very easy nor hard

Q1. 1st angle 3rd angle drawing difference
Ans. 
1st angle and 3rd angle drawings are two different methods of representing a 3D object on a 2D plane.
• 1st angle projection is commonly used in Europe and Asia, where the object is imagined to be in the first quadrant, while 3rd angle projection is commonly used in North America, where the object is imagined to be in the third quadrant.

• In 1st angle projection, the top view is placed below the front view, while in 3rd ang...read more
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Q2. Different symbols of drawing
Ans. 
Different symbols used in engineering drawings represent various elements and features.
• Symbols for dimensions (e.g. diameter, length)

• Symbols for surface finish (e.g. roughness)

• Symbols for welding (e.g. fillet weld)

• Symbols for electrical components (e.g. resistor)

• Symbols for mechanical components (e.g. gear)
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Q3. Cpm pert related
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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
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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Paper test given to candidates

Q1. What is your name
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Q2. Angke of projection explain
Ans. 
Angle of projection refers to the angle at which an object is projected or launched into the air.
• It is the angle between the horizontal line and the direction in which the object is projected.

• The angle of projection affects the range and height of the projectile.

• For maximum range, the angle of projection should be 45 degrees.

• For maximum height, the angle of projection should be 90 degrees (vertical).
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Q3. Stress strain defination and curve
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Q4. Modes of heat transfer
Ans. 
Heat transfer occurs through 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 or gases (e.g. boiling water)

• Radiation: Heat transfer through electromagnetic waves (e.g. feeling the warmth of the sun)
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Q5. Angle of projection
Ans. 
Angle of projection refers to the angle at which an object is launched into the air.
• Angle of projection affects the range and height of the projectile.

• The optimal angle of projection for maximum range is 45 degrees.

• Different angles of projection result in different trajectories of the projectile.

• The angle of projection is measured from the horizontal axis.
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