10+ Instrumentation Commissioning Engineer Interview Questions and Answers

To solve close tank level fluctuation, I would approach by identifying the root cause and implementing appropriate corrective measures.

• Check for any leaks in the tank or piping system

• Ensure proper calibration of level sensors

• Verify the control system settings and adjust if necessary

• Consider installing additional instrumentation such as a surge tank or pressure relief valve

• Perform regular maintenance and inspections to prevent future issues

If PT of extruder package required to change, I will follow the standard procedure for changing PT.

• Refer to the manufacturer's manual for the correct procedure

• Ensure that the system is depressurized and isolated before starting the work

• Use appropriate tools and equipment to remove the old PT and install the new one

• Perform leak testing and calibration after installation

• Update the documentation and inform the relevant personnel about the change

There are three types of orifice plates used to measure DP of a process flow line.

• Concentric

• Eccentric

• Segmental

At least 2 DI and 1 DO loop are needed to control a HT motor.

• DI loops are used for monitoring the motor's status and feedback signals.

• DO loops are used for controlling the motor's speed and direction.

• The number of loops required may vary depending on the specific motor and control system.

• Additional loops may be needed for safety interlocks and alarms.

Follow OSHA guidelines for confined space entry and ensure proper ventilation, communication, and rescue procedures.

• Conduct a thorough hazard assessment before entering the confined space

• Ensure proper ventilation and air quality testing

• Use appropriate personal protective equipment (PPE)

• Establish communication procedures and have a standby person outside the confined space

• Have a rescue plan in place and conduct regular drills

• Train all team members on confined space entry proce...read more

Mass flow is measured based on the principle of conservation of mass and the relationship between flow rate, velocity, and cross-sectional area.

• Mass flow can be measured using various techniques such as Coriolis flow meters, thermal mass flow meters, and differential pressure flow meters.

• The principle of conservation of mass states that mass cannot be created or destroyed, only transferred or converted.

• The relationship between flow rate, velocity, and cross-sectional area is ...read more

The ideal gas equation relates the pressure, volume, and temperature of an ideal gas.

• The ideal gas equation is PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

• It describes the behavior of an ideal gas under various conditions.

• The equation can be used to calculate any one of the variables if the others are known.

• For example, if the pressure, volume, and temperature of a gas are known, th...read more

I can handle multiple types of HMI including SCADA, DCS, and PLC.

• I am proficient in SCADA (Supervisory Control and Data Acquisition) systems.

• I have experience with DCS (Distributed Control System) HMIs.

• I am familiar with PLC (Programmable Logic Controller) HMIs.

• I can work with various HMI software such as Wonderware, Ignition, and FactoryTalk.

• I am capable of configuring and troubleshooting HMI systems.

• I stay updated with the latest HMI technologies and advancements.

PID control is a feedback control mechanism used in automation systems to regulate a process variable.

• PID stands for Proportional-Integral-Derivative.

• It continuously calculates an error value by comparing the desired setpoint with the actual process variable.

• The controller then adjusts the control output based on the error value and the proportional, integral, and derivative gains.

• Proportional control provides an output that is proportional to the error.

• Integral control elimi...read more

TBT stands for 'Tool Box Talk'.

• TBT is a safety meeting held before starting a job or task.

• It is a way to discuss potential hazards and safety procedures.

• TBTs are usually short and focused on a specific topic.

• They are important for promoting a safety culture in the workplace.

• Examples of TBT topics include working at heights, electrical safety, and PPE use.

PID control is necessary to maintain a desired setpoint and compensate for disturbances in a system.

• PID control helps maintain stability and accuracy in a system

• It adjusts the output based on the difference between the setpoint and actual value

• It can compensate for disturbances such as changes in load or input

• Examples include temperature control in HVAC systems and speed control in motors

A vortex flow meter measures fluid flow by detecting the frequency of vortices shed by a bluff body in the flow stream.

• A bluff body is placed in the flow stream to create vortices.

• The frequency of vortices is proportional to the flow rate.

• The meter measures the frequency and calculates the flow rate.

• Vortex flow meters are commonly used in steam, gas, and liquid applications.

DV6200 is calibrated using a multi-point calibration process.

• Perform a zero calibration by disconnecting the sensor and setting the output to zero.

• Perform a span calibration by applying a known input and adjusting the output to match.

• Perform a linearity calibration by applying multiple inputs and verifying the output matches the expected values.

• Record all calibration data and ensure it is within acceptable tolerances.

• Perform regular maintenance and recalibration as needed.

Bernoulli's theorem states that as the speed of a fluid increases, its pressure decreases.

• Describes the relationship between fluid speed and pressure

• Used in fluid dynamics and aerodynamics

• Can be applied to various scenarios such as air flow over an airplane wing or water flow through a pipe

• Formula: P + 1/2pv^2 + pgh = constant (where P is pressure, p is density, v is velocity, g is acceleration due to gravity, and h is height)

Confined space refers to an area with limited access and ventilation, posing potential hazards to workers.

• Examples include tanks, silos, sewers, and tunnels.

• Workers entering confined spaces must follow strict safety protocols.

• Hazards in confined spaces include lack of oxygen, toxic gases, and fire/explosion risks.

• Proper training and equipment are necessary for working in confined spaces.