Preview Questions Instrumentation Engineer | Role Specific Skill

Question 1: What is the main advantage of using a distributed control system (DCS) in process control over a PLC-based system?

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Reduced need for operator intervention during normal operations

Enhanced data integration and centralized control over large, complex processes

Lower cost for large-scale installations

Higher speed and simpler configuration for small, stand-alone systems

Question 2: What is the benefit of using Function Block Diagram (FBD) in PLC programming for chemical plants?

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It restricts the ability to implement logic-based control strategies

It is primarily used for analog control but not digital logic systems

It is less effective for complex systems with multiple control loops

It provides a visual representation of control processes that simplifies programming and troubleshooting

Question 3: What role do control system diagnostics play in maintaining process stability in chemical plants?

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They help identify and troubleshoot system failures quickly, ensuring minimal downtime

They offer no practical benefit if the control system is functioning correctly

They prevent system failures by eliminating the need for maintenance

They are mainly used for verifying the integrity of physical components

Question 4: How can you handle process alarms in a PLC program for a chemical plant to ensure timely response and action?

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By allowing alarms to be triggered only by operator intervention

By disabling alarms during routine operations to minimize interruptions

By programming alarm setpoints and actions that trigger specific outputs or alerts when limits are reached

By ignoring minor process deviations to reduce alarm fatigue

Question 5: How does a cascade control system improve process control in complex chemical processes?

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By eliminating feedback loops to focus solely on setpoint adjustments

By reducing the number of sensors required to monitor the process

By using a secondary loop to correct disturbances in the primary control loop

By simplifying the control process by using one loop for all variables

Question 6: What is the main purpose of using structured text in PLC programming for chemical processes?

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It is used only for simple on/off control systems

It simplifies wiring and hardware connections in PLC systems

It provides a higher-level, more readable code for complex control processes

It allows for the use of graphical symbols for control programming