Aarti Industries DCS Operator Interview Questions and Answers

DCS stands for Distributed Control System, a computerized control system used to control and monitor industrial processes.

• DCS is used in industries such as oil refining, power generation, and manufacturing.

• It allows for centralized control of multiple control loops and process units.

• DCS typically consists of controllers distributed throughout the plant, connected by a communication network.

• Examples of DCS vendors inclu...read more

DCS (Distributed Control System) is a system used to control and monitor industrial processes.

• DCS uses multiple controllers distributed throughout a plant to control various processes

• It allows for centralized monitoring and control of the entire system

• DCS systems often use graphical interfaces for operators to interact with the system

• DCS can be used in industries such as oil and gas, power generation, and manufacturing

TLV of chlorine is the maximum concentration of chlorine that a worker can be exposed to without experiencing adverse health effects.

• TLV stands for Threshold Limit Value

• TLV for chlorine is 1 ppm (parts per million)

• TLV is set by the American Conference of Governmental Industrial Hygienists (ACGIH)

• Exposure to chlorine above TLV can cause respiratory irritation, coughing, and chest tightness

Distillation is a process used to separate components of a liquid mixture based on their boiling points. Reflux is the return of condensed vapors back into the distillation system.

• Distillation involves heating a liquid mixture to create vapor, then cooling the vapor to collect the separated components.

• The components with lower boiling points vaporize first and are collected, while the components with higher boiling poi...read more

A distillation column is a piece of equipment used in chemical processes to separate mixtures into their individual components.

• Distillation columns use the principle of vapor-liquid equilibrium to separate components based on their boiling points.

• They consist of a vertical column with multiple trays or packing material to facilitate the separation process.

• The feed mixture is introduced at the bottom of the column, and ...read more

Open Loop is a control system where the output is not fed back to the input for correction or adjustment.

• Open Loop control does not use feedback to make adjustments

• It relies solely on the input and predefined control actions

• Examples include automatic doors, traffic lights, and irrigation systems

Reaction is the response or behavior triggered by a stimulus or event.

• Reaction is a response to a stimulus or event.

• It can be physical, emotional, or cognitive.

• Reactions can vary in intensity and duration.

• Examples include flinching when touched by something hot, feeling happy after receiving good news, or thinking critically when faced with a problem.

Heat exchangers are devices used to transfer heat between two or more fluids.

• Shell and tube heat exchanger

• Plate heat exchanger

• Double pipe heat exchanger

• Finned tube heat exchanger

• Regenerative heat exchanger

Cascade loops are a series of control loops where the output of one loop is used as the setpoint for the next loop.

• Cascade loops improve control performance by reducing the effect of disturbances.

• They are commonly used in industrial processes where multiple variables need to be controlled.

• An example is a cascade control system in a chemical plant where the flow rate of a reactant is controlled based on the level in a t...read more