40+ 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.

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

Thermal conductivity refers to the ability of a material to conduct heat.

• Thermal conductivity is a property that determines how well a material can transfer heat.

• It is measured in units of watts per meter-kelvin (W/mK).

• Materials with high thermal conductivity can transfer heat quickly, while those with low thermal conductivity transfer heat slowly.

• Metals like copper and aluminum have high thermal conductivity, making them good conductors of heat.

• Insulating materials like wood...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

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

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

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 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

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 extensive work experience in ASRS crane and all types of conveyor.

• I have worked with various types of conveyors such as belt, roller, and chain conveyors.

• I have experience in installation, maintenance, and troubleshooting of ASRS crane systems.

• I am familiar with safety protocols and regulations related to ASRS crane and conveyor systems.

• I have worked on projects involving conveyor automation and optimization.

• I have trained and supervised teams of technicians for convey...read more

Fire protection system is a system designed to detect, control, and extinguish fires to protect people and property.

• Fire detection systems include smoke detectors, heat detectors, and flame detectors

• Fire suppression systems include sprinkler systems, fire extinguishers, and fire blankets

• Fire alarm systems alert occupants of a building in case of a fire emergency

• Fire protection systems are designed based on building codes and regulations

• Regular maintenance and testing of fire ...read more

Unit weight of structure refers to the weight of a material per unit volume.

• Unit weight is typically measured in pounds per cubic foot or kilograms per cubic meter.

• It is an important factor in determining the overall weight of a structure and its load-bearing capacity.

• For example, the unit weight of concrete is around 150 pounds per cubic foot.

• Different materials have different unit weights, so it is important to consider this when designing structures.

Thermodynamic law governs energy transfer in a system. Refrigeration system cools a space by removing heat. Measurement system measures physical quantities.

• Thermodynamic law states that energy cannot be created or destroyed, only transferred or converted

• Refrigeration system works by removing heat from a space and transferring it outside

• Measurement system uses instruments to measure physical quantities such as temperature, pressure, and flow rate

• Common refrigerants used in ref...read more

Offset on hydrant line refers to a deviation from the straight line of the pipeline.

• Offset is used to avoid obstacles or to change the direction of the pipeline.

• It can be achieved by using elbows, bends, or fittings.

• Offset should be kept to a minimum to avoid pressure drop and flow restriction.

• Proper calculation and design of offset is important to ensure efficient and safe operation of the hydrant line.

AI stands for Artificial Intelligence, which refers to the simulation of human intelligence in machines that are programmed to think and learn like humans.

• AI involves the development of algorithms that can perform tasks that typically require human intelligence, such as visual perception, speech recognition, decision-making, and language translation.

• Examples of AI applications include virtual assistants like Siri and Alexa, self-driving cars, recommendation systems on platfor...read more

Break down condition in plant maintenance refers to the state of equipment or machinery when it stops functioning properly.

• Break down condition occurs when equipment fails to operate as intended

• It can be caused by wear and tear, lack of maintenance, or unexpected issues

• Breakdowns can lead to production delays, increased costs, and safety hazards

• Regular inspections and preventive maintenance can help reduce breakdowns

• Examples: a machine overheating and shutting down, a pump fa...read more

Material grades refer to the classification of materials based on their composition and properties.

• Material grades are used to specify the quality and characteristics of materials used in engineering projects.

• Different types of materials have different grades based on their chemical composition, mechanical properties, and performance.

• Common material grades for mechanical engineering include steel grades such as ASTM A36, AISI 304 stainless steel, and aluminum grades like 6061...read more

Carnot cycle is a theoretical thermodynamic cycle that describes the most efficient way to convert heat into work.

• It consists of four reversible processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression.

• It operates between two heat reservoirs at different temperatures.

• The efficiency of the cycle is given by the ratio of the temperature difference between the two reservoirs to the temperature of the hotter reservoir.

• It is used as a...read more

Isometric drawing shows a 3D view of piping while P&ID shows the process flow and equipment layout.

• Isometric drawing is used to represent a 3D view of piping and its components.

• P&ID drawing shows the process flow and equipment layout in a plant.

• Isometric drawing is used for fabrication and installation purposes.

• P&ID drawing is used for design, operation, and maintenance purposes.

• Isometric drawing shows the dimensions and angles of piping components.

• P&ID drawing uses symbols t...read more

A unit is a standard quantity used to express a physical quantity.

• Units are used to measure length, weight, volume, time, temperature, etc.

• Examples of units include meters, kilograms, liters, seconds, degrees Celsius, etc.

Internal gears in a gearbox are gears with teeth on the inside surface, meshing with external gears to transmit power.

• Internal gears have teeth on the inside surface

• They mesh with external gears to transmit power

• Internal gears are commonly used in planetary gear systems

Valves are mechanical devices used to control the flow of fluids or gases. There are various types of valves.

• Valves are used to regulate, isolate, or control the flow of fluids or gases.

• They can be operated manually or automatically.

• Some common types of valves include ball valves, gate valves, globe valves, and check valves.

• Ball valves have a spherical closure unit that allows for quick shut-off.

• Gate valves have a sliding gate that controls the flow of fluid.

• Globe valves have...read more

Major losses in boiler refer to energy losses that occur during the operation of a boiler due to various factors.

• Major losses in boiler include radiation losses, convection losses, and exhaust gas losses.

• Radiation losses occur due to heat being lost through the boiler walls and surroundings.

• Convection losses happen when hot gases leave the boiler without transferring all their heat to the water.

• Exhaust gas losses occur when hot gases exit the boiler at a higher temperature th...read more

The calorific value of fuel is the amount of heat energy released per unit mass of fuel burned.

• Calorific value is typically measured in units like kilojoules per kilogram (kJ/kg) or British thermal units per pound (BTU/lb).

• Higher calorific value indicates more energy content in the fuel.

• Different fuels have different calorific values, for example, coal has a higher calorific value than wood.

• Calorific value is important in determining the efficiency of combustion processes and...read more

Corrosion in metal occurs due to chemical reactions with the environment, leading to deterioration of the metal surface.

• Corrosion is caused by exposure to moisture, oxygen, and other chemicals

• Electrochemical reactions between the metal and its environment lead to the formation of corrosion products

• Common types of corrosion include rusting of iron and tarnishing of silver

• Preventive measures such as coatings, galvanization, and alloying can help protect metals from corrosion

High risk can be tackled by identifying potential hazards, implementing safety measures, and having a contingency plan.

• Conduct a thorough risk assessment to identify potential hazards

• Implement safety measures such as personal protective equipment and safety protocols

• Develop a contingency plan to address potential emergencies

• Train employees on safety procedures and emergency response

• Regularly review and update safety protocols and contingency plans

English, Spanish, French

• English - Fluent in speaking, reading, and writing

• Spanish - Conversational level

• French - Basic understanding

ASRS system works by automatically storing and retrieving goods in a warehouse using computer-controlled systems.

• ASRS systems use computer-controlled mechanisms to move items to and from storage locations.

• They can be operated using various technologies such as conveyor belts, cranes, or robotic arms.

• ASRS systems help optimize warehouse space and improve inventory management.

• Examples of ASRS systems include automated carousels, vertical lift modules, and shuttle systems.

The radiator is a heat exchanger used in vehicles to cool the engine by transferring heat from the coolant to the surrounding air.

• The radiator is typically located at the front of the vehicle, behind the grille.

• It consists of a series of tubes and fins that allow the coolant to flow through and dissipate heat.

• As the engine runs, the coolant absorbs heat and flows into the radiator.

• Air passing through the radiator cools the coolant, which then circulates back to the engine.

• The...read more

NFPA codes are standards set by the National Fire Protection Association to ensure safety in various industries.

• NFPA 70 (National Electrical Code) - covers electrical installations

• NFPA 101 (Life Safety Code) - focuses on safety in buildings

• NFPA 13 (Standard for the Installation of Sprinkler Systems) - addresses fire sprinkler systems

Detectors are devices used to detect or measure something. There are various types of detectors used in different fields.

• Smoke detectors

• Gas detectors

• Metal detectors

• Motion detectors

• Radiation detectors

• Temperature detectors

• Humidity detectors

• Pressure detectors

• Level detectors

• Flow detectors