Deccan Fine Chemicals R&D Chemist Interview Questions and Answers

Herbicide is a type of pesticide used to kill unwanted plants.

• Herbicides are chemicals that are used to control or kill unwanted plants.

• They are commonly used in agriculture to prevent weeds from competing with crops.

• Some herbicides are selective, meaning they only target specific types of plants, while others are non-selective and will kill any plant they come into contact with.

• Examples of herbicides include glyphosat...read more

PI Industries is a leading agrochemical company in India that manufactures and supplies a wide range of products.

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Bernoulli's theorem explains the relationship between fluid speed and pressure.

• Bernoulli's theorem states that as the speed of a fluid increases, its pressure decreases.

• It is important in industries such as aviation, where it is used to design wings and airfoils.

• It is also used in the design of pipelines and pumps.

• Limitations include the assumption of incompressible and non-viscous fluids, and the neglect of friction a...read more

Pump is used to transfer fluids from one place to another while compressor is used to compress gases.

• Pump is used to move fluids like water, oil, etc. from one place to another.

• Compressor is used to compress gases like air, refrigerant, etc.

• Pumps are used in industries, households, and agriculture while compressors are used in refrigeration, air conditioning, and gas pipelines.

• Pumps have a lower pressure ratio while co...read more

Closing a shutoff valve while the pump is running dry can cause damage to the pump and other components.

• The pump will continue to run but without any fluid to circulate, causing it to overheat and potentially seize.

• The lack of fluid can also cause damage to the impeller and other internal components.

• The pressure in the system can also increase, leading to potential leaks or bursts in the pipeline.

• It is important to ens...read more

Closing the shutoff valve while pumping in a centrifugal pump can cause damage to the pump and the piping system.

• The pump will continue to generate pressure, leading to a buildup of pressure in the piping system.

• This can cause the pump to overheat and potentially damage the impeller.

• The piping system may also experience damage due to the increased pressure.

• It is important to ensure that the shutoff valve is only closed...read more

Connecting pumps in series increases head while connecting in parallel increases flow rate.

• Connecting pumps in series increases the total head of the system while connecting in parallel increases the total flow rate.

• In series connection, the discharge remains the same while the head increases.

• In parallel connection, the head remains the same while the discharge increases.

• Series connection is used when high head is requ...read more

Dimensions of power, energy, force and acceleration.

• Power is measured in watts (W) and is the rate at which work is done.

• Energy is measured in joules (J) and is the capacity to do work.

• Force is measured in newtons (N) and is the push or pull on an object.

• Acceleration is measured in meters per second squared (m/s^2) and is the rate of change of velocity.

Valves are mechanical devices used to control the flow of fluids or gases.

• Valves are used in various industries such as oil and gas, water treatment, and chemical processing.

• They can be classified into different types such as gate valves, ball valves, and butterfly valves.

• Valves can be operated manually or automatically using actuators.

• They play a crucial role in maintaining the safety and efficiency of industrial proc...read more

Types of what? Please provide more context.

• Please provide more context for the question.

• Without context, it is impossible to provide a meaningful answer.

• Types can refer to many different things, such as types of engineering, types of materials, types of software, etc.

Heat transfer is the movement of thermal energy from one object to another. There are three modes of heat transfer: conduction, convection, and radiation.

• Conduction is the transfer of heat through a material without any movement of the material itself. Example: Touching a hot stove.

• Convection is the transfer of heat through the movement of fluids (liquids or gases). Example: Boiling water.

• Radiation is the transfer of h...read more