Dow Chemical International Private Limited Interview Questions and Answers for Freshers

A presentation based on the core values

Discussion about a task in a group

Q1. What is a polymer
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A polymer is a large molecule composed of repeating structural units, typically connected by covalent chemical bonds.
• Polymers can be natural (e.g. proteins, DNA) or synthetic (e.g. plastics, rubber)

• They have a wide range of properties and applications, such as in packaging, textiles, and biomedical devices

• Polymerization is the process of combining monomers to form a polymer chain
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Q2. What components make up paint
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Paint is made up of pigments, binders, solvents, and additives.
• Pigments provide color and opacity to the paint (e.g. titanium dioxide)

• Binders hold the pigment particles together and adhere them to the surface (e.g. acrylic resins)

• Solvents help to keep the paint in liquid form and evaporate during drying (e.g. water, mineral spirits)

• Additives enhance specific properties of the paint such as flow, leveling, or durability
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Normal maths ,time and work questions

Q1. Instrument transformer, current transformer, power flow questions and basic electrical
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Q1. Askied any experience in projects And in paint field
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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?
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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?
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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
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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
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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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