Preview Questions Instrumentation Engineer | Role Specific Skill

Question 1: How does a safety instrumented system (SIS) differ from a standard DCS in process control?

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SIS is used to optimize product yield

SIS is designed to ensure the process reaches a safe state during hazardous conditions

SIS is a cost-effective alternative to DCS systems for controlling process variables

SIS provides advanced control features like predictive maintenance

Question 2: How does an RTD (Resistance Temperature Detector) work to measure temperature in chemical processes?

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By comparing the temperature with a known reference standard

By measuring changes in the electrical resistance of the sensor element as temperature varies

By detecting the expansion of the sensor material as temperature increases

By measuring the voltage across the sensor at varying temperatures

Question 3: How does a dynamic matrix control (DMC) system improve process control in a chemical plant?

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By eliminating the need for operator input in controlling process variables

By simplifying the control strategy to a single-loop PID controller

By reducing the number of sensors and control loops needed

By optimizing multi-variable interactions using predictive models

Question 4: Which programming language is most commonly used for PLC programming in the petrochemical industry?

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Structured Text

Ladder Logic

Assembly language

Function Block Diagram (FBD)

Question 5: What are the key considerations when programming a PLC for a multi-variable control system in chemical processes?

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Limiting the number of variables involved to avoid system overload

Focusing only on single-variable control loops to minimize complexity

Ensuring that the system can process multiple input/output relationships and maintaining stable control

Ignoring process dynamics and relying solely on manual interventions

Question 6: What is the purpose of using a manometer in pressure measurement systems in a chemical plant?

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To measure small pressure differences with high accuracy

To calculate the volume of gas in the system

To measure large pressures in high-flow systems

To reduce the cost of pressure measurement by eliminating sensors