Praxair Operations Executive Interview Questions and Answers

Q1. Quetions related Customer complaints like how you will handle queries
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Q2. Scenarios related with Customer complaints
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Q3. Hypothetical Scenarios
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Q1. Asking about back ground and also CTC structure also expected salary
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Q2. Telling about back ground details previous employer and expectations
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Q3. All salery related asking its proof
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Q4. Giving bank statement
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Q1. Asking related about utility section and Sap .. also asking about technical questions also asking root cost
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Q2. Telling about utility and sap
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Q1. Asking about All process details knowledge and my experience
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Q2. Telling him all process about utility and mechanical knowledge
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Q3. How to check mechanical seal oky
Ans. 
To check mechanical seal, perform visual inspection, pressure test, and leakage test.
• Perform visual inspection to check for any visible damage or wear on the seal

• Conduct a pressure test to ensure the seal can withstand the required pressure

• Perform a leakage test to check if the seal is properly sealing the joint

• Check the temperature of the seal to ensure it is within the specified range

• Check the lubrication of the seal
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Q4. By calculate runout of shaft
Ans. 
Runout of a shaft can be calculated by measuring the amount of deviation from a true circular path.
• Use a dial indicator to measure the deviation of the shaft from a true circular path

• Rotate the shaft and take readings at various points to get an accurate measurement

• Calculate the average deviation to determine the runout of the shaft

• Runout can be caused by various factors such as misalignment, bent shaft, or worn bearin
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Q5. Utility load how to calculate
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Utility load is calculated by determining the total power consumption of all devices connected to the utility grid.
• Determine the power consumption of each device connected to the grid

• Add up the total power consumption of all devices

• Consider the time of day and season to account for varying energy demands

• Factor in any renewable energy sources or backup generators

• Use software tools to automate the calculation process
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Q6. Telling about technical solutions
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Q1. Introduce your self to us
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It will be of Medium difficulty

It's is consists of easy questions

Q1. 25 mins on coding 15 mins on aptitude 10 mins on communication
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Q1. 1) Introduce yourself 2) Basic technical questions 3) Why choose Dow 4) Where you see yourself after 5 years 5) Basic fundamental and Logical quetions
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Q1. General aptitude, instrumentation questions
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3 different topics-food and culture pros and cons

Q1. About flowmwters
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Q1. Lots of technical questions
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Q2. How many points need inspection
Ans. 
The number of points that need inspection varies depending on the specific context and requirements.
• The number of points needing inspection can be determined by the scope of the analysis or evaluation.

• Factors such as the size of the dataset, complexity of the data, and specific objectives of the analysis can influence the number of points to inspect.

• For example, in a quality control process, a certain percentage of pro...read more
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Q3. Is tml important for maintenance
Ans. 
Yes, Total Maintenance Loss (TML) is important for maintenance as it helps in identifying critical equipment and prioritizing maintenance activities.
• TML is a key performance indicator used to measure the overall maintenance effectiveness of a system or equipment.

• It helps in identifying equipment that is causing the most downtime or losses in production.

• By analyzing TML, maintenance teams can prioritize their efforts on...read more
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Q1. How to design the diameter of distillation column
Ans. 
The diameter of a distillation column is designed based on factors such as feed flow rate, composition, pressure, and efficiency.
• Calculate the required vapor and liquid flow rates based on the feed composition and desired separation efficiency.

• Consider the pressure drop along the column and the desired residence time for the vapor and liquid phases.

• Use design equations and correlations to determine the optimal diameter...read more
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Q2. How to calculate no of trays and reflux ratio?
Ans. 
Number of trays and reflux ratio can be calculated using various methods such as McCabe-Thiele method or Fenske equation.
• Use McCabe-Thiele method for distillation columns to determine number of trays required.

• Calculate reflux ratio by dividing the liquid returning to the column by the liquid leaving the top tray.

• Consider factors such as desired separation efficiency and operating conditions when determining number of t
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Q3. Tray vs packing?
Ans. 
Tray is used for organizing items while packing is the process of placing items in a container for transportation or storage.
• Tray is typically used for organizing small items or serving food, while packing involves placing items in a container for transportation or storage.

• Trays can come in various sizes and materials, such as plastic, metal, or wood, while packing materials can include boxes, bags, or containers.

• Examp...read more
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Q4. How to calculate p drop in a pipe
Ans. 
To calculate pressure drop in a pipe, use the Darcy-Weisbach equation or the Hazen-Williams equation.
• Use the Darcy-Weisbach equation: ΔP = f * (L/D) * (ρ * V^2) / 2

• Use the Hazen-Williams equation: ΔP = 10.67 * Q^1.85 / (C^1.85 * D^4.87)

• Where ΔP is the pressure drop, f is the Darcy friction factor, L is the pipe length, D is the pipe diameter, ρ is the fluid density, V is the fluid velocity, Q is the flow rate, and C is...read more
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Q5. Explain le chatelier principle
Ans. 
Le Chatelier's principle states that a system at equilibrium will respond to a stress by shifting to counteract the stress and restore equilibrium.
• If a stress is applied to a system at equilibrium, the system will adjust to minimize the effect of the stress.

• Changes in concentration, pressure, or temperature can cause a shift in equilibrium.

• For example, if more reactants are added to a system at equilibrium, the system ...read more
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