Instrumentation Officer

Instrumentation Officer Interview Questions and Answers

Updated 5 Jul 2024

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Q1. What is RTD, thermocouple, proximity sensor, different types flow meter, level measuring instruments, pressure measuring instruments,techo,pid control, control valve, pressure switch,weight feeder etc.topc

Ans.

RTD, thermocouple, proximity sensor, flow meter, level measuring instruments, pressure measuring instruments, techo, PID control, control valve, pressure switch, weight feeder are all types of instrumentation devices used in various industries.

RTD stands for Resistance Temperature Detector and measures temperature using the principle of electrical resistance.
Thermocouples are temperature sensors that consist of two different metals joined together, generating a voltage propor...read more

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Q2. Difference between Hot loop cold loop? What is hook-up Diagrams?

Ans.

Hot loop and cold loop are two types of control loops used in instrumentation. Hook-up diagrams show the connection between instruments.

Hot loop is used for high temperature applications while cold loop is used for low temperature applications.
Hot loop uses thermocouples or RTDs while cold loop uses thermistors.
Hook-up diagrams show the physical connection between instruments, such as transmitters, controllers, and valves.
Hook-up diagrams are used to ensure proper installatio...read more

Q3. What is difference between PLC, DCS and SCADA?

Ans.

PLC, DCS and SCADA are industrial control systems used for automation and monitoring.

PLC (Programmable Logic Controller) is used for discrete control and is ideal for applications with a high number of digital inputs and outputs.
DCS (Distributed Control System) is used for continuous control and is ideal for applications with a high number of analog inputs and outputs.
SCADA (Supervisory Control and Data Acquisition) is used for monitoring and control of large-scale processes ...read more

Q4. What types of control systems??

Ans.

There are various types of control systems used in instrumentation.

Open loop control system
Closed loop control system
Feedback control system
Feedforward control system
Proportional-Integral-Derivative (PID) control system
On-Off control system
Fuzzy logic control system
Programmable Logic Controller (PLC) control system

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Q5. What are the zones classification

Ans.

Zones classification refers to the classification of hazardous areas based on the presence of flammable gases or vapors.

Zones are classified as Zone 0, Zone 1, and Zone 2 based on the likelihood of a flammable atmosphere being present.
Zone 0: Area where flammable gases or vapors are present continuously or for long periods of time.
Zone 1: Area where flammable gases or vapors are likely to be present during normal operation.
Zone 2: Area where flammable gases or vapors are not ...read more