Vishnu Chemicals Process Engineer Interview Questions and Answers

Q1. Design Steps of a shell and tube heat exchanger?
Ans. 
Design steps for a shell and tube heat exchanger
• Determine the heat duty and fluid flow rates

• Select the appropriate materials for the tubes and shell

• Determine the number of tube passes and tube layout

• Design the baffles and tube supports

• Calculate the heat transfer area and pressure drop

• Specify the inlet and outlet connections

• Prepare detailed fabrication drawings
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Q2. Pressure Drop in column?
Ans. 
Pressure drop in a column refers to the decrease in pressure as fluid flows through the column.
• Pressure drop is caused by frictional resistance to flow and changes in direction of the fluid.

• It can be calculated using Bernoulli's equation or by measuring pressure at different points in the column.

• Pressure drop can affect the efficiency of the column and may require adjustments to the operating conditions.

• Factors that ca...read more
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Q3. What is HAZOP, MSDS?
Ans. 
HAZOP is a hazard and operability study, while MSDS is a material safety data sheet.
• HAZOP is a systematic and structured approach to identify potential hazards and operability problems in a process plant.

• MSDS is a document that provides information on the properties of hazardous chemicals and how to handle them safely.

• HAZOP involves a team of experts analyzing the process design and identifying potential deviations tha...read more
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Q1. It is on previous experience base.
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Q1. Tell me about yourself.
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Quantitative aptitude, Reasoning

Q1. What is the difference between centrifugal pump and reciprocating pump
Ans. 
Centrifugal pumps use impellers to move fluid while reciprocating pumps use pistons or diaphragms.
• Centrifugal pumps are more commonly used for high flow rate and low viscosity fluids while reciprocating pumps are used for low flow rate and high viscosity fluids.

• Centrifugal pumps are generally less expensive and require less maintenance than reciprocating pumps.

• Reciprocating pumps are better suited for applications wher...read more
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Q1. What is the difference between short term goals and long term goals
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Q2. Why should we hire you
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Q1. Diff types of HE,Pumps
Ans. 
HE refers to Heat Exchangers and pumps are used to move fluids. Types of HE include shell and tube, plate and frame, and spiral. Types of pumps include centrifugal, positive displacement, and axial flow.
• Heat Exchangers: shell and tube, plate and frame, spiral

• Pumps: centrifugal, positive displacement, axial flow
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Q2. Types of pumps ,heat exchange
Ans. 
Different types of pumps and heat exchangers are used in process engineering.
• Types of pumps include centrifugal, positive displacement, and axial flow pumps.

• Heat exchangers can be classified as shell and tube, plate and frame, or air-cooled.

• Pumps are used to transfer fluids in a process while heat exchangers are used to transfer heat between fluids.

• Selection of pumps and heat exchangers depends on the process requireme...read more
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Q1. Mass balance question
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Q2. Basic organic chemistry question
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Q1. 1. Ongoing work and project related
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Q2. 2. Basic chemistry and chemical engineering questions
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Q3. 3. Troubleshooting and risk assessment study
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Q1. Explain Chemical Engineering Thermodynamics ?
Ans. 
Chemical Engineering Thermodynamics is the study of energy and its transformations in chemical processes.
• It involves the analysis of heat transfer, work, and energy flow in chemical systems.

• It helps in understanding the behavior of chemical reactions and the design of efficient processes.

• Thermodynamics principles are used to optimize process conditions and maximize energy efficiency.

• Examples include calculating heat tr...read more
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Q2. Basics , thermodynamic properties , PVT diagram ,
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Q1. What is NPSH in centrifugal pump?
Ans. 
NPSH stands for Net Positive Suction Head in a centrifugal pump.
• NPSH is a measure of how much suction pressure is required at the pump inlet to prevent cavitation.

• It is important to ensure that the NPSH available (NPSHa) is greater than the NPSH required (NPSHr) for the pump to operate efficiently.

• NPSH is affected by factors such as pump speed, fluid properties, and system design.

• Cavitation can occur if the NPSH availa...read more
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Q2. Types of distillation
Ans. 
Distillation is a separation process that involves heating a liquid mixture to create vapor and then cooling the vapor to get a purified liquid.
• Types of distillation include simple distillation, fractional distillation, and steam distillation.

• Simple distillation is used for separating components with large boiling point differences.

• Fractional distillation is used for separating components with closer boiling points.

• Ste...read more
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Q3. Types of impeller in centrifugal pump
Ans. 
Types of impellers in centrifugal pumps include closed, open, semi-open, and vortex.
• Closed impeller: all flow enters and exits through the impeller blades

• Open impeller: flow enters through the center and exits along the blades

• Semi-open impeller: flow enters through the eye and exits along the blades

• Vortex impeller: flow enters through the eye and exits through the periphery

• Impeller selection depends on the application
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Q1. How have you applied your knowledge of chemical engineering prociples in the design and optimization of manufacturing process
Ans. 
I have applied my knowledge of chemical engineering principles in designing and optimizing manufacturing processes by analyzing reaction kinetics, heat transfer, and mass transfer.
• Utilizing reaction kinetics to determine optimal reaction conditions for maximum yield

• Applying heat transfer principles to design efficient heat exchangers for temperature control

• Optimizing mass transfer processes to improve separation effici...read more
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