PI Industries Executive Production Interview Questions, Process, and Tips

Polar solvents have a positive and negative end, while nonpolar solvents have no charge.

• Polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes.

• Water is a polar solvent, while oil is a nonpolar solvent.

• Polarity is determined by the electronegativity difference between atoms in a molecule.

A fire extinguisher is a device used to control or extinguish small fires. There are different classes of fire extinguishers for different types of fires.

• Fire extinguishers are classified based on the type of fire they can extinguish.

• Class A fire extinguishers are used for fires involving ordinary combustibles like wood, paper, or cloth.

• Class B fire extinguishers are used for fires involving flammable liquids like gaso...read more

Safety valves and rupture discs are important safety devices in production processes.

• Safety valves are designed to release excess pressure in a system to prevent explosions or other hazardous situations.

• Rupture discs are used as a backup to safety valves and are designed to burst at a predetermined pressure to release excess pressure.

• Both safety valves and rupture discs are critical components in ensuring the safety of...read more

Heat exchanger design involves selecting appropriate materials, determining heat transfer coefficients, and optimizing flow rates.

• Consider the type of fluid being used and its properties

• Choose materials that can withstand the temperature and pressure of the fluids

• Calculate the heat transfer coefficients for each fluid

• Optimize the flow rates to maximize heat transfer efficiency

• Consider the overall size and cost of the h

Material balance and energy balance equations are used to track the flow of materials and energy in a system.

• Material balance equation is based on the principle of conservation of mass.

• Energy balance equation is based on the principle of conservation of energy.

• Material balance equation: Input = Output + Accumulation

• Energy balance equation: Input = Output + Storage + Losses

• Example: In a chemical reactor, the material ba...read more

Heat transfer occurs in three modes: conduction, convection, and radiation.

• Conduction is the transfer of heat through a material without any movement of the material itself.

• Convection is the transfer of heat through the movement of fluids or gases.

• Radiation is the transfer of heat through electromagnetic waves.

• Examples of conduction include touching a hot stove or iron, while examples of convection include boiling wate...read more

Centrifugal force is the apparent force that acts outward on a body moving around a center, arising from the body's inertia.

• Centrifugal force is not a real force, but rather a perceived force.

• It is the result of an object's inertia trying to keep it moving in a straight line while it is being forced to move in a circular path.

• Examples include the feeling of being pushed to the side in a car when turning a corner, or th...read more

There are various types of dryers used in production, including rotary dryers, fluidized bed dryers, and spray dryers.

• Rotary dryers use a rotating drum to dry materials.

• Fluidized bed dryers use hot air to suspend and dry materials.

• Spray dryers use a nozzle to spray liquid into a hot air stream, creating a fine powder.

• Other types of dryers include freeze dryers, vacuum dryers, and paddle dryers.

AHU is a part of HVAC system. AHU is a device that circulates air while HVAC is a system that controls temperature, humidity and air quality.

• AHU stands for Air Handling Unit

• AHU is a part of HVAC system

• AHU circulates air while HVAC controls temperature, humidity and air quality

• HVAC stands for Heating, Ventilation and Air Conditioning

• HVAC is a system that provides thermal comfort and acceptable indoor air quality

• Examples...read more