Instrumentation Trainee Interview Questions and Answers

Instrumentation systems are used in companies to monitor and control various processes and equipment.

• Instrumentation systems help in ensuring the safety and efficiency of operations.

• They provide real-time data on process variables such as temperature, pressure, flow rate, and level.

• By monitoring these variables, companies can detect and prevent potential issues or failures.

• Instrumentation systems also enable automation and remote control of processes, improving productivity.

• T...read more

Flow measurement instruments are devices used to measure the rate of flow of fluids or gases.

• Flow meters are commonly used instruments for flow measurement.

• Some common types of flow meters include electromagnetic flow meters, ultrasonic flow meters, and turbine flow meters.

• Electromagnetic flow meters use Faraday's law of electromagnetic induction to measure flow.

• Ultrasonic flow meters use ultrasonic waves to measure flow.

• Turbine flow meters use a rotating turbine to measure f...read more

4-20mA signal is used instead of 0-20mA because it allows for a reliable and accurate measurement of the process variable.

• 4-20mA signal provides a clear distinction between zero and full-scale measurement.

• It allows for easy detection of faults or breaks in the circuit.

• The 4mA minimum value ensures that the signal is always present, even if the measurement is at its lowest possible value.

• The 20mA maximum value provides a standardized upper limit for the signal.

• This signal rang...read more

Draw P&ID for a control loop and explain the control strategy.

• Identify the process variable to be controlled

• Select the appropriate control element

• Choose the appropriate controller

• Determine the setpoint and control range

• Establish the control algorithm

• Implement the control loop

• Monitor and adjust the control loop as necessary