Unichem Laboratories Interview Questions, Process, and Tips

Bound moisture refers to water molecules that are chemically attached to a substance.

• Bound moisture cannot be removed by simple drying methods.

• It is often found in pharmaceuticals, food products, and other materials.

• Bound moisture can affect the stability and shelf life of a product.

• It is important to measure and control bound moisture levels in manufacturing processes.

Crystallization is the formation of crystals from a solution, while precipitation is the formation of solid particles from a solution.

• Crystallization involves the formation of a crystal lattice structure, while precipitation does not.

• Crystallization is a more controlled process, while precipitation can be more random.

• Crystallization is often used in the production of pharmaceuticals, while precipitation is used in wast...read more

Mesh can be measured by counting the number of openings per inch or centimeter.

• Count the number of openings in a linear inch or centimeter

• Use a mesh gauge to measure the size of the openings

• Measure the thickness of the wire used to make the mesh

• Calculate the open area of the mesh

• Compare the mesh to a standard reference chart

Reynolds number is a dimensionless quantity used to predict fluid flow patterns and turbulence.

• It is used to determine whether a fluid flow is laminar or turbulent

• It is calculated using the fluid velocity, density, viscosity, and characteristic length

• Higher Reynolds number indicates turbulent flow while lower indicates laminar flow

• It is named after Osborne Reynolds, a British physicist and engineer

Stop the process immediately and investigate the cause of emulsion formation.

• Stop the agitation and allow the emulsion to settle.

• Analyze the composition of the batch to identify the cause of emulsion formation.

• Adjust the process parameters such as temperature, pH, or mixing speed to prevent emulsion formation in future batches.

• Consider using additives or surfactants to stabilize the emulsion.

• Consult with experts or col...read more

There are several classes of solvents, including polar, nonpolar, protic, aprotic, and supercritical fluids.

• Polar solvents dissolve polar compounds and have a dipole moment, such as water and ethanol.

• Nonpolar solvents dissolve nonpolar compounds and lack a dipole moment, such as hexane and benzene.

• Protic solvents have a hydrogen atom attached to an electronegative atom and can donate hydrogen bonds, such as methanol an...read more

The number of plates in a sparkler filter varies depending on the size and capacity of the filter.

• The number of plates can range from a few to several hundred.

• The size and capacity of the filter determine the number of plates needed.

• The plates are typically made of stainless steel or other durable materials.

• The plates are arranged in a stack and held together by a central rod.

• The filter is used to remove impurities fro...read more

I'm sorry, I need more context. Permits for what?

• Please provide more information about the context of the permits.

• Are you referring to permits for a specific industry or activity?

• Without additional information, I cannot provide an accurate answer.

A device used to extinguish small fires by releasing chemicals or water.

• Fire extinguishers come in different types, such as water, foam, powder, and CO2.

• They are typically found in public buildings, homes, and vehicles.

• Fire extinguishers should be inspected and maintained regularly to ensure they are in working condition.

• They are designed to be used on small fires and should not be used on large or spreading fires.

• The ...read more

Retrospective validation is the process of validating a system or process after it has been in use.

• It involves analyzing historical data to ensure that the system or process has been consistently meeting its intended requirements and specifications.

• It is often used when a system or process was not validated before it was put into use.

• Retrospective validation can also be used to identify areas for improvement and to upd...read more