Aarti Industries
10+ Modus Business Transformation Platform Interview Questions and Answers
Q1. What is distillation ?? Tell about reflux also
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 points remain in the liquid phase.
Reflux is the process of re...read more
Q2. What is Distributed control system
A Distributed Control System (DCS) is a computerized control system used to control and monitor industrial processes.
Consists of multiple control elements distributed throughout a system
Allows for centralized control and monitoring of processes
Used in industries such as oil and gas, power generation, and manufacturing
Examples include Honeywell Experion PKS, Emerson DeltaV, and Siemens PCS 7
Q3. What is cascade loops
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 tank.
Q4. What is distillation column
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 as it rises, the components with lower boiling points vapo...read more
Q5. What is TLV of chlorine
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
Q6. What is open Loop
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
Q7. What is Reaction
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.
Q8. What is DCS ???
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 include Siemens, Emerson, and Honeywell.
Q9. How DCS work ??
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
Q10. Types of heat exchanger
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
Q11. Types of control valves
Control valves are used to regulate the flow of fluids in a process system by varying the size of the flow passage.
Globe valves: used for throttling and control of flow
Butterfly valves: used for on/off control of flow
Ball valves: used for quick shut-off
Diaphragm valves: used for precise control of flow
Q12. Types of reactors
Types of reactors include batch reactors, continuous stirred tank reactors, plug flow reactors, and fluidized bed reactors.
Batch reactors operate in a closed system with a fixed amount of reactants.
Continuous stirred tank reactors have continuous flow of reactants and products.
Plug flow reactors have a continuous flow with no mixing of reactants along the length of the reactor.
Fluidized bed reactors use a fluid to suspend solid particles, allowing for better mixing and heat t...read more
Q13. Types of Alarms
Types of alarms in a DCS system include process alarms, equipment alarms, safety alarms, and communication alarms.
Process alarms indicate issues with the process being controlled by the DCS system
Equipment alarms alert to malfunctions or failures of equipment connected to the DCS system
Safety alarms warn of potentially dangerous situations that require immediate attention
Communication alarms signal problems with the communication network used by the DCS system
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