Larsen & Toubro Limited Process Engineer Interview Questions and Answers

Q1. Pump curve to be explained
Ans. 
A pump curve is a graphical representation of a pump's performance characteristics.
• Pump curve shows the relationship between flow rate, head, power, and efficiency of a pump.

• It helps in selecting the right pump for a specific application based on the required flow rate and head.

• The curve typically consists of multiple lines representing different pump speeds or impeller diameters.

• The intersection point of the system cu...read more
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Q2. Control valve cv calc
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Q1. Experience to be explained
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Q2. Expectations to be explained
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Q1. How do the metal-air batteries work?
Ans. 
Metal-air batteries generate electricity through the reaction of metal with oxygen from the air.
• Metal-air batteries use a metal anode, typically zinc, and oxygen from the air as the cathode.

• During discharge, the metal anode oxidizes, releasing electrons that flow through an external circuit to power a device.

• The oxygen from the air reacts with the metal ions at the cathode, forming metal oxides and releasing additional...read more
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Q2. What are the strategies for Decarbonization?
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Strategies for decarbonization involve transitioning to renewable energy sources, improving energy efficiency, and implementing carbon capture technologies.
• Transitioning to renewable energy sources such as solar, wind, and hydro power

• Improving energy efficiency in industrial processes and buildings

• Implementing carbon capture and storage technologies to reduce emissions

• Promoting sustainable transportation options like e...read more
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Q1. How is a HAZOP (Hazard and Operability Study) performed?
Ans. 
HAZOP is a structured technique to identify hazards and operability issues in process systems through team brainstorming.
• Assemble a multidisciplinary team with expertise in the process.

• Define the scope of the study, including the system boundaries and objectives.

• Identify key nodes or sections of the process to analyze.

• Use guide words (e.g., 'No', 'More', 'Less') to prompt discussions on potential deviations.

• Evaluate th...read more
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Q2. What are the calculations involved in hydraulic pump design?
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Hydraulic pump design involves calculations for flow rate, pressure, efficiency, and power requirements.
• Flow Rate Calculation: Q = A × v, where Q is flow rate, A is cross-sectional area, and v is velocity.

• Pressure Calculation: P = F/A, where P is pressure, F is force, and A is area. Example: Calculate pressure needed to lift a load.

• Power Requirement: P = Q × ΔP, where P is power, Q is flow rate, and ΔP is pressure diff...read more
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Q3. What is the process for sizing Pressure Safety Valves (PSVs)?
Ans. 
Sizing PSVs involves calculating the required flow rate and selecting the appropriate valve based on system parameters.
• Determine the set pressure and the maximum allowable working pressure (MAWP) of the system.

• Calculate the required flow rate using the formula: Q = A * V, where Q is flow rate, A is valve area, and V is velocity.

• Consider the type of fluid (gas, liquid, or vapor) and its properties (density, viscosity) f...read more
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Q1. Scope of work taken up in earlier company which are applicable for our company ( Alstom)
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Q2. Manufacturing & calibration related topics for Carbody fixture
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Q3. Paint RAL code & paint thickness applied on fixture.
Ans. 
The paint RAL code and thickness applied on the fixture is recorded for quality control purposes.
• The RAL code is a standardized color code system used in Europe.

• The paint thickness is measured using a paint thickness gauge.

• The recorded data is used to ensure consistency in the painting process and to meet customer specifications.

• Example: RAL 9005 (Jet Black) with a paint thickness of 50 microns.
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Q4. Make of clamps used on fixture
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The clamps used on the fixture are made by various manufacturers.
• The make of clamps used on the fixture may vary depending on the specific fixture and its requirements.

• Some common manufacturers of clamps include Bessey, Irwin, and Jorgensen.

• The type of clamp used may also vary, such as C-clamps, bar clamps, or spring clamps.
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Q5. What is VSM graph and it's application
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VSM graph is a tool used in Lean manufacturing to map out the current state of a process and identify areas for improvement.
• VSM stands for Value Stream Mapping

• It is used to visualize the flow of materials and information through a process

• Helps identify waste and inefficiencies in the process

• Can be used to plan and implement process improvements

• Example: A VSM graph can be used to identify bottlenecks in a manufacturing ...read more
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Q1. What challenges you feel you might face of you join madhepura ( it's a remote site hence the question)
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Q2. Why do you think you are suitable for the job and how your earlier experience will be useful forus ( Alstom)
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Arthematic, Resonaning test for 1hr

Q1. What you know about the company
Ans. 
The company is a leading provider of engineering solutions in the manufacturing industry.
• Specializes in designing and optimizing manufacturing processes

• Offers consulting services to improve efficiency and productivity

• Works with a variety of industries such as automotive, aerospace, and pharmaceutical

• Known for innovative solutions and cutting-edge technology

• Has a strong focus on continuous improvement and quality contro...read more
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