50+ Site Engineer Mechanical Interview Questions and Answers

Copper is more efficient and durable than aluminium in terms of conductivity.

• Copper has a higher electrical conductivity than aluminium.

• Copper is more resistant to corrosion and oxidation compared to aluminium.

• Copper has better thermal conductivity than aluminium.

• Copper is commonly used in electrical wiring, power transmission, and heat exchangers.

• Aluminium is lighter and more cost-effective than copper, making it suitable for certain applications.

The I beam and H beam are structural steel members with different cross-sectional shapes. If the fitter is absent, I would take the following steps:

• Assess the progress of the work and identify the tasks that can be done without the fitter.

• Delegate the tasks to other available workers or coordinate with other teams to ensure the work continues smoothly.

• If the absence of the fitter significantly affects the progress or safety of the project, consider hiring a replacement or tem...read more

Hydraulic systems work on the principles of Pascal's law and Bernoulli's principle.

• Hydraulic systems operate based on Pascal's law, which states that pressure exerted on a fluid is transmitted equally in all directions.

• According to Bernoulli's principle, as the speed of a fluid increases, its pressure decreases.

• Hydraulic systems use fluid pressure to generate force and transmit power.

• They rely on the incompressibility of fluids to transfer force and motion.

• Examples of hydraul...read more

Abbreviations of various codes used in mechanical engineering.

• ASME SEC-II - American Society of Mechanical Engineers Section II

• ASME SEC-V - American Society of Mechanical Engineers Section V

• ASME SEC-VIII - American Society of Mechanical Engineers Section VIII

• ASME SEC-IX - American Society of Mechanical Engineers Section IX

• API-1104 - American Petroleum Institute Code for Welding of Pipelines

• AWS D1.1 - American Welding Society Structural Welding Code - Steel

• ASME B31.8 - America...read more

Safety valves with higher pressure to blow are typically set at 10-15% above the operating pressure.

• Safety valves with higher pressure to blow are usually set at 10-15% above the operating pressure to ensure they open only in case of overpressure.

• For example, if the operating pressure is 100 psi, the safety valve may be set to blow at 110-115 psi.

• This ensures that the safety valve only opens when the system is truly at risk of overpressure, preventing unnecessary releases.

To check welding quality and alignment of structure, various methods can be used such as visual inspection, non-destructive testing, and dimensional checks.

• Visual inspection: This involves visually examining the welds for any defects such as cracks, porosity, or incomplete fusion.

• Non-destructive testing: Techniques like ultrasonic testing, radiography, or magnetic particle testing can be used to detect any internal defects in the welds.

• Dimensional checks: Measuring tools like...read more

Before fixing the splice plate, the beam connecting can be checked by performing visual inspection, measuring dimensions, and conducting non-destructive testing.

• Perform a visual inspection to check for any visible defects or damage on the beam and its connections.

• Measure the dimensions of the beam and its connections to ensure they meet the required specifications.

• Conduct non-destructive testing methods such as ultrasonic testing or magnetic particle inspection to detect any ...read more

Car AC is designed to cool a small, enclosed space quickly while home AC is designed to cool a larger, open space efficiently.

• Car AC is smaller in size and has a lower cooling capacity compared to home AC.

• Car AC is powered by the car's engine while home AC is connected to the electrical grid.

• Home AC units are typically central air systems or window units, while car AC units are compact and portable.

• Car AC is designed to cool a small, enclosed space quickly, while home AC is d...read more

The area and volume of geometric shapes vary based on their dimensions and formulas.

• The area of a square is calculated by multiplying the length of one side by itself.

• The area of a rectangle is calculated by multiplying the length and width.

• The volume of a rectangular prism is calculated by multiplying the length, width, and height.

• The area of a circle is calculated by multiplying pi (approximately 3.14159) by the square of the radius.

• The volume of a cylinder is calculated by...read more

Types of welding, plant equipments, Auto cad drawings

• Types of welding: MIG, TIG, Stick, Flux-cored, etc.

• Plant equipments: Pumps, compressors, boilers, turbines, etc.

• AutoCAD drawings: Creating 2D and 3D models, interpreting technical drawings, using CAD software effectively

The formula for water discharge in a deluge system and the distance between sprinklers is important for designing an effective fire protection system.

• The formula for water discharge in a deluge system is Q = K * A, where Q is the water discharge rate, K is the discharge coefficient, and A is the area covered by the sprinklers.

• The distance between sprinklers in a deluge system is typically determined by the manufacturer's guidelines or industry standards to ensure proper cover...read more

E 6010 type electrode is commonly used in welding applications.

• E 6010 type electrode is a cellulose-based electrode.

• It is primarily used for welding in the vertical and overhead positions.

• The electrode has a deep penetration capability, making it suitable for welding thick materials.

• It is commonly used in the construction industry for welding structural steel.

• E 6010 electrode is also used in pipeline welding, especially for root passes.

• It provides excellent arc stability and ...read more

Structural fabrication typically uses grade 250 steel. The operating temperature of a mother oven can vary depending on the specific oven.

• Grade 250 steel is commonly used in structural fabrication due to its balance of strength and ductility.

• The operating temperature of a mother oven can range from 300 to 500 degrees Celsius, depending on the specific application.

• It is important to consult the manufacturer's specifications for the exact grade of steel and operating temperatur...read more

Minimum 5 years of experience in oil and gas FPSO projects is typically required for a Site Engineer Mechanical role.

• Minimum 5 years of experience is usually expected for oil and gas FPSO projects

• Experience in mechanical engineering specifically related to FPSO projects is essential

• Knowledge of relevant industry standards and regulations is important

• Experience in project management and coordination is beneficial

• Strong communication and problem-solving skills are necessary

Typically, a boiler will have multiple safety valves installed for redundancy and safety purposes.

• Boilers usually have at least two safety valves for redundancy in case one fails.

• The number of safety valves can vary depending on the size and type of boiler.

• Larger industrial boilers may have multiple safety valves to ensure proper pressure relief.

• Some boilers may have three or more safety valves for added safety measures.

Transformer cooling is the process of dissipating heat generated in a transformer to maintain its optimal operating temperature.

• Transformer cooling is essential to prevent overheating and ensure the longevity of the transformer.

• There are several methods of transformer cooling, including air cooling, oil cooling, and water cooling.

• In air cooling, the transformer is cooled by natural convection or forced air circulation using fans.

• Oil cooling involves immersing the transformer ...read more

Compression ratio of CI engines is typically between 16:1 to 20:1.

• Compression ratio is the ratio of the volume of the cylinder when the piston is at the bottom of its stroke to the volume when the piston is at the top of its stroke.

• Higher compression ratios lead to better efficiency and power output.

• Common compression ratios for CI engines range from 16:1 to 20:1.

• Compression ratio can be calculated by dividing the total cylinder volume when the piston is at the bottom by the ...read more

I possess strong designing skills in mechanical engineering, focusing on CAD modeling, system optimization, and innovative solutions.

• Proficient in CAD software like AutoCAD and SolidWorks for creating detailed mechanical designs.

• Experience in designing HVAC systems, ensuring energy efficiency and compliance with regulations.

• Skilled in conducting FEA (Finite Element Analysis) to optimize component designs for strength and durability.

• Developed a custom conveyor system design th...read more

I am highly valuable for your organization due to my expertise, experience, and dedication.

• I have a strong background in mechanical engineering and extensive knowledge of site engineering.

• I have successfully completed several projects, demonstrating my ability to deliver high-quality work on time and within budget.

• I am a quick learner and adapt easily to new technologies and methodologies.

• I am a team player and can effectively collaborate with cross-functional teams to achiev...read more

Insulation refers to the process of reducing heat transfer or sound transmission between objects or spaces.

• Insulation is used to maintain desired temperatures in buildings, equipment, or systems.

• It can be achieved through the use of materials with low thermal conductivity, such as fiberglass, foam, or mineral wool.

• Insulation can also be applied to pipes, ducts, or tanks to prevent heat loss or gain.

• It helps in reducing energy consumption and improving energy efficiency.

• Exampl...read more

The UAE Fire Life Safety Code Chapter 9 outlines specifications for firefighting.

• Chapter 9 of the UAE Fire Life Safety Code covers requirements for firefighting equipment and systems

• It includes specifications for fire extinguishers, fire alarms, sprinkler systems, and emergency lighting

• The code also addresses maintenance and testing procedures for firefighting equipment

• Compliance with Chapter 9 is essential to ensure the safety of occupants in buildings

• Training on the proper ...read more

I handle various sections of structures including foundation, framing, and finishing work.

• Foundation work such as footings and slabs

• Framing work including beams, columns, and trusses

• Finishing work like drywall, flooring, and painting

The maximum temperature of water in a deareator tank is typically around 105-110 degrees Celsius.

• The maximum temperature is important for ensuring proper deaeration of water in the tank.

• Exceeding the maximum temperature can lead to damage to the tank and equipment.

• Regular monitoring and maintenance are necessary to ensure the temperature stays within the safe range.

There are several types of maintenance, including preventive, corrective, predictive, and proactive maintenance.

• Preventive maintenance involves regularly scheduled inspections and maintenance tasks to prevent equipment failure.

• Corrective maintenance is performed after a failure has occurred to restore the equipment to its normal operating condition.

• Predictive maintenance uses data analysis and monitoring techniques to predict when maintenance should be performed based on the ...read more

An air conditioner cools indoor air by removing heat and humidity, ensuring comfort in living and working spaces.

• Heat Exchange: Air conditioners use refrigerants to absorb heat from indoor air and release it outside.

• Humidity Control: They reduce humidity levels, making the air feel cooler and more comfortable.

• Air Filtration: Many units include filters that clean the air by trapping dust, allergens, and pollutants.

• Temperature Regulation: Thermostats allow users to set desired ...read more

VT and Centrifugal pumps are used to move fluids from one place to another.

• VT pumps are positive displacement pumps that use a reciprocating motion to move fluids.

• Centrifugal pumps use a rotating impeller to create a flow of fluid.

• VT pumps are commonly used for low flow and high-pressure applications.

• Centrifugal pumps are used for high flow and low-pressure applications.

• VT pumps are more efficient than centrifugal pumps at low flow rates.

• Centrifugal pumps are more efficient t...read more

I have over 5 years of experience in mechanical erection, focusing on precision and safety in various projects.

• Led the erection of a 200-ton HVAC system in a commercial building, ensuring compliance with safety standards.

• Managed a team of 10 during the installation of piping systems for a chemical plant, completing the project ahead of schedule.

• Conducted quality checks and inspections during the erection of a boiler system, resulting in zero safety incidents.

• Collaborated with...read more