10+ Interview Questions and Answers

The PLCs used in our plant are Siemens S7-300 and Allen Bradley ControlLogix. The DCS is Honeywell Experion.

• Siemens S7-300 and Allen Bradley ControlLogix are the PLCs used in our plant

• Honeywell Experion is the DCS used in our plant

To calibrate an interface level transmitter, follow these steps:

• Verify the transmitter is installed correctly and the process is stable

• Determine the calibration range and select appropriate calibration fluids

• Fill the vessel with the calibration fluid and record the transmitter output

• Adjust the transmitter to match the expected output for each calibration point

• Repeat the process for multiple calibration points to ensure accuracy

• Document the calibration process and results for ...read more

There are several types of pressure gauges including Bourdon tube, diaphragm, capsule, and bellows gauges.

• Bourdon tube gauges are the most common and measure pressure through the movement of a curved tube.

• Diaphragm gauges use a flexible membrane to measure pressure.

• Capsule gauges use two diaphragms welded together to measure pressure.

• Bellows gauges use a series of convolutions to measure pressure.

• Other types of pressure gauges include digital gauges and differential pressure ...read more

RTD stands for Resistance Temperature Detector and thermocouple is a temperature sensor made of two different metals.

• RTD measures temperature by detecting changes in electrical resistance of a metal wire as temperature changes.

• Thermocouple measures temperature by detecting changes in voltage as temperature changes.

• RTD is more accurate and stable than thermocouple.

• Thermocouple is cheaper and can measure a wider range of temperatures than RTD.

• RTD is commonly used in industries ...read more

To check zero dp type transmitters, follow these steps:

• Isolate the transmitter from the process

• Ensure the transmitter is at atmospheric pressure

• Verify that the output signal is reading zero

• Adjust the zero if necessary

• Reconnect the transmitter to the process and verify the output signal

A booster relay is an electrical device used to amplify or boost a signal.

• It is commonly used in control circuits to increase the strength of a signal

• It can be used to control high voltage or high current devices

• Examples include motor starters, solenoid valves, and lighting circuits

Control valve calibration involves adjusting the valve to ensure it operates correctly and accurately.

• Determine the valve's range and characteristics

• Connect the valve to a calibration device

• Adjust the valve's position to match the desired output

• Verify the valve's accuracy and repeatability

• Document the calibration process and results

PLC stands for Programmable Logic Controller and DCS stands for Distributed Control System.

• PLC is a digital computer used for automation of electromechanical processes.

• DCS is a control system used to control and monitor industrial processes.

• PLC is used in discrete manufacturing industries while DCS is used in continuous process industries.

• PLC is programmed using ladder logic while DCS is programmed using function blocks.

• Examples of PLC include Siemens S7-1200 and Allen-Bradle...read more

The number of parts in an actuator varies depending on the type and model.

• Actuators can have as few as two parts or as many as several dozen.

• Common parts include a motor, gears, a control board, and a housing.

• Additional parts may include sensors, limit switches, and feedback mechanisms.

• The number of parts can also vary depending on the application and specific requirements.

There are several types of drawings used in instrumentation.

• Piping and Instrumentation Diagrams (P&IDs)

• Electrical Schematics

• Loop Diagrams

• Wiring Diagrams

• Process Flow Diagrams (PFDs)

• Isometric Drawings

Archimedes principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.

• Buoyant force is the upward force exerted on an object submerged in a fluid.

• The weight of the fluid displaced by the object is equal to the buoyant force.

• Archimedes principle is used to explain why objects float or sink in fluids.

• Example: A ship floats on water because the weight of the water it displaces is equal to the weight of the ship.