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. What is fluid ?
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Q2. What is powe r?
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Q3. What is machine
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Q4. What is unit of power
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Q5. What is the unitless quantity
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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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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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Online aptitude test

Q1. Some normal calculation skill and english reading tecnical questions leat count of vernier about quality mesurment instument production type cnc vmc tyes of machining its all basic
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Q2. Ony aree to any condion i will work
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