Lumax Industries Trainee Operating Engineer Interview Questions and Answers

There were 60 questions in 60 min mcqs from medium to hard at difficulty level. after the online assessment 30 out of 120 students were selected for GD .

The topics for gd were very easy and there were 2 panels

Q1. What do you know about embedded system ?
Ans. 
Embedded systems are specialized computing systems designed to perform specific tasks within a larger system.
• Embedded systems are typically used in consumer electronics, automotive systems, industrial machines, and medical devices.

• They are designed to be efficient, reliable, and real-time in nature.

• Examples of embedded systems include microcontrollers in washing machines, automotive engine control units, and pacemakers...read more
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Q2. Describe pcb designing methods and steps?
Ans. 
PCB designing involves creating a layout for printed circuit boards to connect electronic components.
• Start by creating a schematic diagram of the circuit

• Select components and place them on the board

• Route traces to connect components based on electrical requirements

• Perform design rule checks to ensure proper spacing and connections

• Generate Gerber files for manufacturing
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Q1. Tell us about yourself and your family
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Q2. Your 5 year goals from now?
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Q1. My introduction
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Q2. My strength and weakness
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Q3. Did I worked before ?
Ans. 
Yes, I have worked before in various internships and part-time positions.
• I have completed internships at ABC Company and XYZ Organization.

• I have worked part-time as a sales associate at Retail Store.

• I have also volunteered at local community events.

• I have gained valuable experience and skills from my previous work experiences.
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Q1. PROJECT EXPLAINED VERY WELL
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Q2. ACADEMIC PERFORMANCE AND INTRO
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Q1. What is fluid ?
Ans. 
Fluid is a substance that flows and takes the shape of its container.
• Fluid is a state of matter that has no fixed shape and yields easily to external pressure.

• Examples of fluids include water, oil, and air.

• Fluids can be classified as liquids or gases based on their properties.
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Q2. What is powe r?
Ans. 
Power is the rate at which work is done or energy is transferred.
• Power is measured in watts (W)

• It is calculated as the product of voltage and current (P = V x I)

• Power can also be calculated as the rate of energy transfer (P = E / t)

• Higher power means more work can be done in a shorter amount of time
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Q3. What is machine
Ans. 
A machine is a device that uses power to perform a task.
• Machines can be simple, like a lever or pulley, or complex, like a computer or car engine.

• They are designed to make work easier by transferring force from one point to another.

• Examples include washing machines, airplanes, and cranes.
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Q4. What is unit of power
Ans. 
The unit of power is the watt (W), which measures the rate at which work is done or energy is transferred.
• The unit of power is the watt (W)

• Power is the rate at which work is done or energy is transferred

• 1 watt is equal to 1 joule per second

• Common examples of power include light bulbs (measured in watts) and engines (measured in horsepower)
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Q5. What is the unitless quantity
Ans. 
A unitless quantity is a physical quantity that does not have any units associated with it.
• Unitless quantities are often used in mathematical calculations and comparisons.

• Examples include angles (measured in radians), pure numbers (such as ratios or percentages), and constants like pi.

• Unitless quantities are dimensionless and do not require any specific units for measurement.
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Q1. What is the combustion chamber ,?
Ans. 
The combustion chamber is where fuel and air are mixed and burned in an internal combustion engine.
• It is a part of an internal combustion engine where the fuel-air mixture is ignited and burned.

• The combustion chamber is designed to contain and control the combustion process.

• It is typically located within the cylinder head of an engine.

• The shape and design of the combustion chamber can affect engine performance and effi
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Q2. Explain the refrigerant system?.
Ans. 
Refrigerant system is a closed loop system that absorbs heat from a low-temperature area and releases it in a high-temperature area.
• Refrigerant circulates through the system to absorb and release heat

• Compressor increases the pressure of the refrigerant gas

• Condenser cools the refrigerant gas into a liquid

• Expansion valve reduces the pressure of the liquid refrigerant

• Evaporator absorbs heat from the surrounding area to co...read more
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Easy to moderate questions are given on general aptitude part.

Q1. What about yourself
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Q2. Tell about your college life
Ans. 
My college life was a mix of academics, extracurricular activities, and making lifelong friendships.
• Studied engineering with a focus on mechanical engineering

• Participated in various college events and competitions

• Was a member of the college robotics club

• Made close friends who I still keep in touch with
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Q3. Are you comfortable at any shift?
Ans. 
Yes, I am comfortable working at any shift as per the company's requirements.
• I am flexible and adaptable to different shift schedules.

• I understand the importance of teamwork and meeting project deadlines, which may require working different shifts.

• I am willing to adjust my personal schedule to accommodate the needs of the company.

• I have previous experience working in shifts and have successfully managed my time and res...read more
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Q1. What is your favourite subject?
Ans. 
My favorite subject is Mechanical Engineering because I enjoy learning about how machines work and designing new technologies.
• I enjoy studying topics like thermodynamics, fluid mechanics, and materials science.

• I like working on projects that involve designing and building machines or systems.

• I find the principles of mechanical engineering fascinating and enjoy applying them to real-world problems.
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Q2. Working of micrometre
Ans. 
Micrometre is a precision measuring instrument used to measure small distances accurately.
• Micrometre consists of a stationary anvil and a movable spindle.

• The object to be measured is placed between the anvil and spindle, and the spindle is turned to make contact with the object.

• The measurement is read from the scale on the sleeve and thimble of the micrometre.

• Micrometres are commonly used in engineering and manufacturi...read more
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Q3. What is degree of freedom
Ans. 
Degree of freedom refers to the number of independent variables or parameters that can vary in a system.
• Degree of freedom is the number of variables that can be changed independently without affecting the overall system.

• In mechanics, a rigid body in a plane has 3 degrees of freedom - two translations and one rotation.

• In thermodynamics, a simple compressible substance has 2 degrees of freedom - temperature and pressure.

• ...read more
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Q4. Types of forging , rolling
Ans. 
Forging and rolling are two common metalworking processes used to shape metal into desired forms.
• Forging involves shaping metal by applying compressive forces, typically using a hammer or press.

• Types of forging include open-die forging, closed-die forging, and impression-die forging.

• Rolling involves passing metal between rollers to reduce thickness or change shape.

• Types of rolling include hot rolling, cold rolling, and
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Q5. Tell me about manufacturing process
Ans. 
Manufacturing process involves converting raw materials into finished products through various steps and techniques.
• Manufacturing process starts with the design of the product

• Raw materials are sourced and inspected for quality

• Materials are processed through various methods like casting, molding, machining, etc.

• Quality control checks are performed at different stages

• Finished products are packaged and distributed to cust
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General aptitude and technical questions from every engg field (mech,CS, Electrical,Electronics)
Need basic technical knowledge to crack

Group debate of 18-20 candidates with 9-10 in each team (in favour and against)

Topics related to Automobile industry or latest trends

18 candidates selected from 3 GDs

Q1. Family background
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Q2. Why Denso, what makes you eligible
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Q3. AC is an electrical appliance but sold in Electronics shop why so?
Ans. 
AC is sold in Electronics shops because it is an electrical appliance that utilizes electronic components for its operation.
• ACs use electronic components like capacitors, resistors, and microcontrollers for regulating temperature and controlling functions.

• Electronics shops specialize in selling a wide range of electronic devices, including appliances like ACs.

• ACs are considered as part of the electronics category due t...read more
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Q4. Any other recruitment filled ?
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Q1. How can you operate 4 different light bulbs under different trigger condition?
Ans. 
To operate 4 different light bulbs under different trigger conditions, use a combination of switches, timers, sensors, and programming.
• Use individual switches to control each light bulb independently.

• Set up timers to automatically turn on/off specific light bulbs at scheduled times.

• Utilize sensors such as motion sensors or light sensors to trigger certain light bulbs based on environmental conditions.

• Program a microcon...read more
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Q2. What is the process of cooling in AC
Ans. 
AC cooling process involves refrigerant absorbing heat from indoor air and releasing it outside.
• Refrigerant absorbs heat from indoor air through evaporator coils

• The warm refrigerant is then pumped to the condenser coils located outside

• Condenser coils release the heat absorbed from indoor air to the outside environment

• The refrigerant then goes back to the evaporator coils to repeat the cycle
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Q3. Basics of semiconductor devices (by japanese panelist)
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Q4. How can you make a transistor if semiconductor material is given to you (by japanese panelist)
Ans. 
To make a transistor, semiconductor material can be used to create a structure with three layers: emitter, base, and collector.
• Start by doping the semiconductor material with impurities to create the different layers.

• Use lithography and etching techniques to define the structure of the transistor.

• Add metal contacts to the different layers to allow for electrical connections.

• Test the transistor to ensure proper function...read more
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