ExxonMobil Instrument Engineer Interview Questions and Answers

Oil & Gas standards and instrumentation loop basics.

• Oil & Gas industry follows various standards like API, ISO, etc.

• Instrumentation loop is a closed circuit of sensors, transmitters, controllers, and final control elements.

• It is used to measure and control process variables like temperature, pressure, flow, etc.

• The loop can be either analog or digital and can be configured in various ways like 2-wire, 3-wire, 4-wire, e...read more

Process variable is the measured parameter in a system, while control system is the mechanism used to regulate the process variable.

• Process variable is the input to the control system

• Control system uses feedback to adjust the process variable

• Examples of process variables include temperature, pressure, flow rate

• Examples of control systems include PID controllers, PLCs, DCSs

Tubing fitting size and installation work

• The tubing fitting size should match the size of the tubing being used

• Proper installation techniques should be followed to ensure a secure and leak-free connection

• Common types of tubing fittings include compression, flare, and push-to-connect fittings

Control valves are devices used to regulate the flow of fluids in a system by varying the size of the flow passage.

• Control valves have various parts including valve body, actuator, positioner, and valve trim.

• Valve body is the main part of the control valve that houses the internal components.

• Actuator is responsible for moving the valve plug to control the flow.

• Positioner ensures the valve plug is in the correct positio...read more

Salary deductions are common in CTC structures due to various components like PF, gratuity, taxes, etc.

• CTC includes various components like basic salary, HRA, PF, gratuity, etc.

• Deductions are made for PF, professional tax, income tax, etc.

• Net salary received is after deducting these components.

• Employers may also offer additional benefits like insurance, bonuses, etc.

Standard maintenance procedures for instruments involve regular inspections, calibrations, and repairs to ensure optimal performance.

• Regularly inspect instruments for any signs of wear or damage

• Calibrate instruments according to manufacturer's guidelines

• Perform routine maintenance tasks such as cleaning and lubricating

• Keep detailed records of maintenance activities for each instrument

• Train staff on proper instrument ma...read more

Electromagnetic flowmeter measures flow rate by using Faraday's law of electromagnetic induction.

• Electromagnetic flowmeter is based on the principle of Faraday's law of electromagnetic induction.

• It consists of a flow tube, electrodes, and a magnetic field.

• When a conductive fluid flows through the flow tube, it generates a voltage proportional to the flow rate.

• The electrodes detect the voltage and the magnetic field ens...read more

Interacting systems have feedback loops and can influence each other's behavior, while non-interacting systems operate independently.

• Interacting systems have mutual dependencies and can affect each other's inputs, outputs, or behavior.

• Non-interacting systems operate independently and do not have any influence on each other.

• Interacting systems often involve feedback loops where the output of one system affects the input...read more

Yes, I have worked with Vibration Monitoring Systems.

• I have experience in installing and configuring vibration monitoring systems.

• I have conducted regular inspections and maintenance of vibration monitoring equipment.

• I have analyzed vibration data to identify potential issues and recommend corrective actions.

• I have worked with various types of vibration sensors and transducers.

• I have collaborated with other engineers a...read more

Control valves can be classified into different types based on their design and function.

• Globe valves

• Butterfly valves

• Ball valves

• Diaphragm valves

• Needle valves

• Gate valves

• Check valves

• Pressure relief valves