20+ Commissioning Engineer Interview Questions and Answers

I have extensive expertise in water and wastewater treatment plants.

• I have a strong understanding of the processes involved in water and wastewater treatment, including coagulation, flocculation, sedimentation, filtration, and disinfection.

• I am experienced in designing and commissioning various types of treatment systems, such as activated sludge, membrane filtration, and reverse osmosis.

• I have knowledge of the equipment and instrumentation used in water and wastewater treatm...read more

To manage a 10 or 15 people group at site, effective communication, delegation, and leadership skills are essential.

• Establish clear goals and expectations for the team.

• Communicate regularly and openly with the team members to ensure everyone is on the same page.

• Delegate tasks based on individual strengths and skills.

• Provide necessary resources and support to the team.

• Encourage collaboration and teamwork among the group members.

• Address conflicts or issues promptly and fairly.

• L...read more

The types of columns in commissioning engineering include packed columns and tray columns. Troubleshooting in columns involves identifying and resolving issues with pressure, temperature, flow, and separation efficiency.

• Types of columns: packed columns and tray columns

• Types of stages/plates: bubble cap trays, sieve trays, valve trays

• Types of packing: structured packing, random packing

• Troubleshooting in columns: pressure issues, temperature issues, flow issues, separation effi...read more

The best simulation of shrinkage in thermal expansion of casting is achieved through finite element analysis (FEA).

• Finite Element Analysis (FEA) is commonly used to simulate shrinkage in thermal expansion of casting.

• FEA software allows for accurate prediction of shrinkage and deformation during the casting process.

• By inputting material properties, boundary conditions, and thermal gradients, FEA can provide valuable insights into the casting process.

• Examples of FEA software co...read more

Types of boilers include fire tube, water tube, and electric boilers. Installation process involves site preparation, assembly, piping, and testing.

• Types of boilers: fire tube, water tube, electric

• Installation process: site preparation, assembly, piping, testing

• Examples: Fire tube boiler - used in small industrial plants, Water tube boiler - used in power stations

Thermal expansion affects PDC and press tool manufacturing due to Young's modulus.

• Thermal expansion can cause dimensional changes in materials during manufacturing processes.

• Young's modulus is a measure of a material's stiffness and resistance to deformation.

• PDC (Polycrystalline Diamond Compact) is a material commonly used in cutting tools due to its hardness and wear resistance.

• Press tools are used in metal forming processes and must be designed to account for thermal expans...read more

The maintenance protocol of switchgear and transformer involves regular inspections, testing, cleaning, and preventive maintenance.

• Regular inspections are conducted to identify any signs of wear, damage, or malfunction.

• Testing is performed to ensure the equipment is functioning properly and within specified parameters.

• Cleaning is necessary to remove dust, dirt, and debris that can affect performance.

• Preventive maintenance includes tasks like lubrication, tightening connection...read more

To correct casting thickness within a model, adjust the design parameters and re-run simulations.

• Modify the CAD model to adjust the thickness of the casting.

• Update the material properties and casting parameters in the simulation software.

• Run simulations to analyze the effects of the changes on the casting quality.

• Iterate the process until the desired casting thickness is achieved.

• Consult with design engineers and casting experts for guidance.

VFDs are used in power plants to control the speed of motors and pumps, resulting in energy savings and improved process control.

• VFDs are used in boiler feed pumps to control the flow of water to the boiler, resulting in improved efficiency and reduced wear and tear on the equipment.

• VFDs are used in cooling tower fans to adjust the speed of the fan based on the cooling demand, resulting in energy savings.

• VFDs are used in air handling units to control the speed of the fan base...read more

To change trim line within a process, you need to adjust the setpoint of the control system.

• Access the control system interface

• Locate the trim line parameter

• Adjust the setpoint to change the trim line

• Monitor the process to ensure the trim line is functioning correctly

Checks done while starting the pump include verifying power supply, checking for leaks, ensuring proper alignment, and monitoring vibration levels.

• Verify power supply to the pump

• Check for any leaks in the pump system

• Ensure proper alignment of the pump with the motor or drive shaft

• Monitor vibration levels to ensure smooth operation

Flow rate can be calculated by dividing the volume of fluid passing through a pipe or channel by the time it takes to pass.

• Flow rate = Volume / Time

• Units of flow rate are typically liters per minute (L/min) or cubic meters per second (m^3/s)

• Flow rate can be measured using flow meters or calculated based on known parameters such as pipe diameter and fluid velocity

Yes, I have a transferable iqama.

• I have a transferable iqama.

• I can provide the necessary documentation to prove it.

• Having a transferable iqama allows me to work in different locations without any restrictions.

• It demonstrates my flexibility and adaptability to new environments.

The coal mill can trip on various reasons such as coal hang-up, mill overload, flame detector failure, etc.

• Coal hang-up: when coal sticks to mill internals due to high moisture content or poor coal quality

• Mill overload: when the mill motor is overloaded due to high coal flow or low grindability

• Flame detector failure: when the flame detector fails to detect the flame in the furnace

• Other reasons: such as feeder blockage, coal pipe blockage, etc.

Commissioning activities are the set of procedures and tests performed to ensure that a system or equipment is ready for operation.

• Inspection and verification of equipment installation

• Functional testing of individual components

• Integration testing of the entire system

• Performance testing to ensure the system meets specifications

• Documentation of test results and procedures

• Training of operators and maintenance personnel

Cold commissioning is done without the presence of heat sources, while hot commissioning involves testing with heat sources.

• Cold commissioning is done at ambient temperature, while hot commissioning involves operating equipment at design temperature.

• Cold commissioning focuses on mechanical and electrical systems, while hot commissioning tests the performance of the system under normal operating conditions.

• Cold commissioning is typically done before hot commissioning to identi...read more

The question is unclear. 1 MW is a unit of power, not a unit of measurement.

• 1 MW is a unit of power, not a unit of measurement

• It is like asking how many pounds are in a mile

• The question needs to be rephrased or clarified

Mold temperature depends on various factors such as material type, cooling system, injection speed, and mold design.

• Material type: Different materials require different mold temperatures for optimal results.

• Cooling system: The efficiency of the cooling system affects the mold temperature.

• Injection speed: Faster injection speeds may require higher mold temperatures to prevent defects.

• Mold design: The design of the mold can impact how heat is distributed and controlled.

A confined space is an area that is not designed for continuous occupancy, has limited entry and exit points, and may have poor ventilation.

• Confined spaces are typically small and enclosed, such as tanks, silos, tunnels, and crawl spaces.

• These spaces may contain hazardous substances, lack oxygen, or have other dangerous conditions.

• Workers entering confined spaces must follow strict safety protocols, including proper training, equipment, and monitoring.

• Examples of confined spa...read more

AHU operates based on setpoint temperature, fan speed, and air flow requirements.

• AHU receives signals from temperature sensors to maintain setpoint temperature.

• Fan speed is adjusted based on cooling or heating demand.

• Air flow is controlled to meet ventilation requirements.

• AHU may have filters to remove contaminants from the air.

• Variable Air Volume (VAV) systems adjust air flow based on zone requirements.

Flue gas outlet temperature is the temperature of the gas leaving the combustion chamber.

• Flue gas outlet temperature is an important parameter to monitor the efficiency of a combustion process.

• It is usually measured using a thermocouple or infrared thermometer.

• The temperature should be within the design limits to avoid any damage to the equipment.

• For example, in a gas turbine, the flue gas outlet temperature should not exceed 650°C.

• The flue gas outlet temperature can also be ...read more

Loto stands for Lockout Tagout, a safety procedure used to ensure that dangerous machines are properly shut off and not started up again prior to the completion of maintenance or servicing work.

• Loto involves locking the energy isolating device with an assigned individual lock and tag.

• Only the person who applied the lock and tag can remove them after the work is completed.

• Loto helps prevent accidents caused by the unexpected startup of machinery during maintenance.

• Examples of ...read more