Molex Mechanical Product Design Engineer Interview Questions and Answers

Q1. Tell me about you previous internship experience
Ans. 
I completed a 6-month internship at ABC Company where I worked on designing and testing mechanical components for automotive applications.
• Designed and analyzed mechanical components using CAD software

• Conducted tests and simulations to evaluate performance and durability

• Collaborated with cross-functional teams to optimize designs and troubleshoot issues
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Q1. Material required for shaft,gear,pully manufacturing?
Ans. 
The materials required for shaft, gear, and pulley manufacturing include metals such as steel, cast iron, and aluminum.
• Shafts are commonly made from steel due to its strength and durability.

• Gears can be manufactured from materials like cast iron, steel, or even plastic depending on the application.

• Pulleys are often made from aluminum or steel, with steel being preferred for heavy-duty applications.

• Other materials like ...read more
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Q2. Different types of direction control valve?
Ans. 
Direction control valves are used to control the flow of fluid in a hydraulic or pneumatic system.
• Solenoid-operated directional control valve

• Manual directional control valve

• Pilot-operated directional control valve

• Proportional directional control valve

• Check valve
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Q3. Mechanical engineering drawing?
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Q4. What is sequence valve?
Ans. 
A sequence valve is a type of pressure control valve that opens and allows flow when a set pressure is reached.
• Sequence valves are used to ensure a specific sequence of operations in hydraulic systems.

• They are typically used in applications where multiple hydraulic cylinders need to be actuated in a specific order.

• When the pressure in the system reaches the set pressure of the sequence valve, it opens and allows flow t...read more
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Reasoning & Engineering knowledge.

Q1. Engineering Thermodynamics
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Q2. Engineering mechanics
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Engineering subjects

Q1. Can you provide a brief introduction about yourself?
Ans. 
I am a Mechanical Design Engineer with 5 years of experience in designing and developing mechanical systems.
• Graduated with a degree in Mechanical Engineering from XYZ University

• Proficient in CAD software such as SolidWorks and AutoCAD

• Experience in designing components for automotive industry

• Strong problem-solving skills and attention to detail

• Worked on projects involving thermal analysis and stress testing
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Q1. Could you explain the locations on a cantilever beam where failure may occur when a significant force is applied to its free end?
Ans. 
Failure may occur at the fixed support, near the point of application of the force, or at the junction of the beam and the support.
• Failure may occur at the fixed support due to excessive bending moment.

• Near the point of application of the force, failure may occur due to shear stress.

• At the junction of the beam and the support, failure may occur due to a combination of bending and shear stresses.
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Basic level reasoning and simple math

Q1. Hoop stress Heat exchanger depth Critical radius of insulation And some basic som questions
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Q2. 3-d printer discussion
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Q3. Major project discussion
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Q4. Defination of stress
Ans. 
Stress is the force per unit area that a material experiences when subjected to an external load.
• Stress is a measure of the internal forces within a material.

• It is calculated as force per unit area.

• Stress can cause deformation or failure of a material.

• There are different types of stress, such as tensile, compressive, and shear stress.

• Examples of stress include the weight of a book on a table, the force applied to a bri...read more
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Q1. Situation based questions
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Q2. Stress strain Curve of aluminium
Ans. 
Aluminium stress strain curve shows its elastic and plastic deformation behavior under stress.
• Aluminium has a linear elastic region up to a certain point, beyond which it undergoes plastic deformation.

• The yield strength of aluminium is around 40-90 MPa.

• Ultimate tensile strength of aluminium is around 90-200 MPa.

• Aluminium has a low modulus of elasticity compared to steel.

• The stress strain curve of aluminium can be affec...read more
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Q3. Design a chair for a class
Ans. 
Designed a chair for a class that is comfortable, durable, and ergonomic.
• Consider the height of the desk and the average height of the students

• Use materials that are sturdy and easy to clean

• Incorporate lumbar support and adjustable features for comfort

• Add armrests for additional support

• Ensure the chair has a non-slip base for safety
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Q4. What applied do and how your study make change into this
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Q5. Basic laws of thermodynamics
Ans. 
Basic laws of thermodynamics
• First law: Energy cannot be created or destroyed, only transferred or converted

• Second law: Entropy of a closed system always increases over time

• Third law: Absolute zero cannot be reached

• Examples: car engine, refrigerator, power plant
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Q6. How we cool a pipe in a chamber without using coolent
Ans. 
Cooling a pipe in a chamber without coolant
• Use natural convection by placing the pipe vertically and allowing air to circulate around it

• Use a heat sink to absorb the heat from the pipe

• Use a thermoelectric cooler to create a temperature gradient and cool the pipe

• Use a phase change material to absorb the heat from the pipe

• Use a heat exchanger to transfer the heat from the pipe to a cooler fluid or gas

• Use a radiation shie
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Q7. What is micromaterials
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Micromaterials refer to materials with microscale dimensions, typically less than 100 micrometers.
• Micromaterials have unique properties due to their small size, such as increased surface area to volume ratio and altered mechanical, electrical, and optical properties.

• Examples of micromaterials include microelectromechanical systems (MEMS), microfluidic devices, and microscale sensors.

• Research in micromaterials has appli...read more
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Q8. What we need to do if pressure valve fail in boiler
Ans. 
If pressure valve fails in boiler, shut down the boiler immediately and isolate it from the system.
• Shut down the boiler immediately to prevent any further damage.

• Isolate the boiler from the system to prevent any pressure build-up.

• Inspect the pressure valve to determine the cause of failure.

• Replace the pressure valve with a new one.

• Test the new pressure valve to ensure it is functioning properly before restarting the bo
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Q1. How you contribute with your knowledge in your society
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Q2. How you explore your college
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Q3. Condition where you show your team leader skills
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Q4. How you took you failmly member up in different field
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Q5. What is your extra skills except college study
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Q6. How you deal with a clients regarding which you don't know much
Ans. 
I research and gather information to understand the client's needs and requirements.
• Ask the client questions to gather more information

• Research and study the client's industry and field

• Consult with colleagues or experts in the field

• Provide regular updates to the client on progress and findings

• Be honest about limitations and seek help when needed
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Q7. Any feedback or queries
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