800+ Mechanical Engineer Interview Questions and Answers

Cushion is the amount of money or time added to a project schedule to account for uncertainties and risks.

• Cushion is also known as contingency reserve.

• It is added to the project schedule to ensure that the project is completed on time and within budget.

• The amount of cushion depends on the level of uncertainty and risk involved in the project.

• For example, a project with a high level of uncertainty and risk may require a larger cushion than a project with a low level of uncerta...read more

Core and cavity are the two halves of a mold used in injection molding process.

• Core is the part of the mold that creates the internal features of the plastic part.

• Cavity is the part of the mold that creates the external features of the plastic part.

• Core and cavity are designed to fit together to create the final shape of the plastic part.

• The molten plastic is injected into the cavity and takes the shape of the core.

• The core and cavity are usually made of hardened steel to wit...read more

Load calculation for sheet metal, cutting process, and welding rods is essential for determining material requirements and ensuring structural integrity.

• Calculate load based on the dimensions and material properties of the sheet metal

• Consider the type of cutting process (e.g. laser cutting, plasma cutting) and its impact on the load calculation

• Determine the load requirements for welding rods based on the type of welding process and material being joined

Kalrez o-rings can withstand temperatures up to 327°C while PTFE o-rings can handle temperatures up to 260°C.

• Kalrez o-rings have a higher temperature range than PTFE o-rings

• Kalrez o-rings can handle temperatures up to 327°C

• PTFE o-rings can handle temperatures up to 260°C

Petrol engines use spark ignition while diesel engines use compression ignition.

• Petrol engines use a spark plug to ignite the fuel-air mixture while diesel engines compress the air to a high enough temperature to ignite the fuel.

• Petrol engines are generally more fuel-efficient at high speeds while diesel engines are more fuel-efficient at low speeds.

• Petrol engines are typically quieter and smoother while diesel engines are more rugged and durable.

• Petrol engines are more commo...read more

Putting petrol in a diesel engine can cause damage to the engine due to differences in combustion properties.

• Petrol has lower lubrication properties than diesel, leading to increased wear and tear on engine components.

• Petrol can cause knocking in a diesel engine due to differences in ignition properties.

• Mixing petrol with diesel can also lead to decreased fuel efficiency and potential engine misfires.

• It is important to drain the fuel tank and flush the fuel system if petrol i...read more

Pigs for cleaning pipes in oil & gas industry are selected based on size, material, and design compatibility with the pipeline.

• Consider the size of the pig to ensure it fits the diameter of the pipeline

• Choose a pig made of materials compatible with the substances being transported in the pipeline

• Select a pig design that suits the cleaning requirements of the pipeline, such as brush pigs for removing debris

A socket is a non-threaded joint where two pipes are connected by sliding one into the other, while a threaded joint involves screwing two pipes together.

• Socket joint is easier to assemble and disassemble compared to threaded joint

• Threaded joint provides a more secure and leak-proof connection

• Socket joint is commonly used in PVC piping systems, while threaded joint is used in metal piping systems

• For low temperature service, materials like carbon steel, stainless steel, and lo...read more

Accessories used in a pump suction and discharge line

• Strainers or filters to prevent debris from entering the pump

• Valves to control the flow of fluid

• Pressure gauges to monitor the pressure

• Flanges to connect the pump to the piping system

• Flexible connectors to absorb vibrations

• Check valves to prevent backflow

• Expansion joints to compensate for thermal expansion

• Flow meters to measure the flow rate

FRL unit, hydraulic pump and different types of valve are all important components in mechanical engineering.

• FRL unit stands for Filter, Regulator, and Lubricator unit which is used to clean, regulate and lubricate compressed air in pneumatic systems.

• Hydraulic pump is used to convert mechanical power into hydraulic energy which is used to power hydraulic machinery.

• Different types of valves include ball valves, gate valves, globe valves, and check valves which are used to cont...read more

The work capacity and heating system of a machine are important factors to consider in mechanical engineering.

• The work capacity of a machine refers to the amount of work it can perform in a given time period.

• The heating system of a machine is important to prevent overheating and ensure optimal performance.

• Factors that affect work capacity and heating system include the type of machine, its size, and the materials used in its construction.

• Examples of machines with high work ca...read more

FIFO stands for First-In-First-Out. It is a method of organizing and manipulating data structures.

• FIFO is beneficial in inventory management where the oldest stock is sold first

• It is also useful in computer science for managing queues and buffers

• FIFO ensures fairness in scheduling processes in operating systems

• It is commonly used in accounting for calculating the cost of goods sold

• FIFO is also used in data communication to ensure that data is transmitted in the order it was s...read more

There is no formula for 'Watar' as it is not a recognized term in engineering.

• There is no known formula or concept related to 'Watar' in the field of mechanical engineering.

• It is possible that the term 'Watar' was misspelled or misunderstood in the question.

• It is important to clarify the term or ask for more information to provide an accurate answer.

There are several types of CNC machines including milling machines, lathes, plasma cutters, and routers.

• Milling machines

• Lathes

• Plasma cutters

• Routers

Rotation in CNC machining refers to the spinning of the cutting tool, while revolution refers to the movement of the workpiece around the cutting tool.

• Rotation involves the cutting tool spinning on its axis to remove material from the workpiece.

• Revolution involves the workpiece moving around the cutting tool to create the desired shape.

• Rotation and revolution work together to accurately shape the workpiece in CNC machining processes.

• Examples include turning operations where t...read more

A lathe is a machine tool that rotates a workpiece about an axis of rotation to perform various operations such as cutting, sanding, drilling, knurling, or deformation.

• Lathe is used to shape and cut materials such as wood, metal, and plastic.

• It rotates the workpiece on its axis and a cutting tool is applied to the workpiece to remove material.

• Lathe can perform various operations such as turning, facing, drilling, boring, and threading.

• Examples of lathe machines include engine...read more

Ring granulator crusher is a machine used to crush coal, minerals, and other materials.

• Ring granulator crushers are used in coal handling plants to crush coal and other materials.

• They consist of a rotor with crushing elements inside a steel cage.

• The drive unit of these crushers includes a gearbox, motor, and coupling.

• The gearbox is used to reduce the speed of the motor and increase the torque.

• The motor provides the power to rotate the rotor and crush the materials.

• The couplin...read more

Check in bearing is a type of bearing that allows axial movement while preventing radial movement.

• Check in bearing is designed to accommodate axial loads.

• It allows movement in one direction while preventing movement in the opposite direction.

• This type of bearing is commonly used in applications where axial displacement is required, such as in automotive suspensions.

• An example of a check in bearing is a thrust bearing used in a gearbox to support axial loads.

The welding required for a 6mm thick MS plate with joint fillet depends on the welding process and type of joint.

• The welding required will depend on the welding process used (e.g. MIG, TIG, stick welding)

• The type of joint (e.g. butt joint, lap joint, fillet joint) will also impact the amount of welding needed

• Calculations can be done based on the length of the joint and the welding process parameters

The percentage of SO2 removed by a FGD system varies depending on the specific system and conditions.

• The percentage of SO2 removal by a FGD system can range from 50% to over 90%, depending on the type of FGD system used.

• Factors such as the type of coal being burned, the design of the FGD system, and operating conditions can all impact the efficiency of SO2 removal.

• For example, a wet FGD system typically achieves higher removal efficiencies compared to a dry FGD system.

• Regular...read more

Various types of equipment used in material handling systems and their specifications in mechanical engineering.

• Type of Wagon Tippler: Rotary Wagon Tippler, Side Arm Charger Wagon Tippler

• Degree of tippling: Typically 135 degrees for Rotary Wagon Tippler

• Type of Crusher: Jaw Crusher, Cone Crusher, Impact Crusher

• Crusher Hammer made: Typically made of high manganese steel

• BELT specifications: Depends on the application, can include width, material, and strength

• Gearbox specificatio...read more

PASAV stands for Pressure Actuated Safety and Automatic Valve. It is used to control the flow of fluids in a system based on pressure levels.

• PASAV is a type of valve used in mechanical systems.

• It automatically opens or closes based on the pressure levels in the system.

• PASAV helps in maintaining safe pressure levels in the system to prevent damage or accidents.

• Example: PASAVs are commonly used in hydraulic systems to regulate pressure and prevent overloading.

The basic refrigeration cycle is a thermodynamic cycle that involves the transfer of heat from a low temperature region to a high temperature region.

• The refrigerant absorbs heat from the low temperature space (evaporation)

• The refrigerant is compressed, raising its temperature and pressure

• The refrigerant releases heat to the high temperature space (condensation)

• The refrigerant expands, lowering its temperature and pressure to start the cycle again

The procedure for dismantling a centrifugal compressor involves several steps to ensure safety and proper disassembly.

• Isolate the compressor from the system and remove any residual pressure

• Disconnect electrical and mechanical connections

• Remove the casing and access the impeller

• Remove the impeller and inspect for damage

• Disassemble the remaining components and inspect for wear or damage

• Clean and store the components properly

As a mechanical engineer, my role involves designing, analyzing, and maintaining mechanical systems and equipment.

• A pump is a mechanical device used to move fluids from one place to another.

• A casting machine is used to create metal parts by pouring molten metal into a mold.

• A compressor is a machine that increases the pressure of a gas by reducing its volume.

• As a mechanical engineer, I would be responsible for selecting, designing, and maintaining these types of equipment.

TIG welding is a welding process that uses a non-consumable tungsten electrode to produce high-quality welds.

• TIG stands for Tungsten Inert Gas.

• It is also known as Gas Tungsten Arc Welding (GTAW).

• TIG welding uses a shielding gas, typically argon, to protect the weld area from contamination.

• It is commonly used for welding thin sections of stainless steel, aluminum, and other non-ferrous metals.

• TIG welding produces precise and clean welds, making it suitable for applications whe...read more

High speed stamping and press machines require plating and automation in all corners for efficient operation.

• Plating helps to prevent corrosion and wear on machine parts.

• Automation improves efficiency and reduces the need for manual labor.

• Proper maintenance and lubrication are essential for optimal performance.

• Examples of plating materials include chrome, nickel, and zinc.

• Examples of automation include robotic arms and computerized controls.

A funnel drawing sketch is required with top and front view.

• Start by drawing a trapezoid shape for the top view

• Add a curved shape for the funnel body

• Draw a circle for the bottom of the funnel

• For the front view, draw a straight line for the height of the funnel

• Connect the top and bottom of the line with a curved shape

• Add any necessary details such as a handle or spout

To calculate the displacement of a bike without tools, measure the distance traveled in one full rotation of the wheel

• Measure the circumference of the bike's wheel

• Count the number of rotations the wheel makes over a certain distance

• Multiply the circumference by the number of rotations to get the displacement

• Displacement = Circumference of wheel x Number of rotations

Manholes are circular because they cannot fall through their own opening.

• Circular manholes cannot fall through their own opening, unlike square or rectangular ones.

• Circular shape distributes weight evenly, making it easier to move and handle.

• Circular shape also reduces the risk of injury from sharp corners.

• Circular manholes are easier to manufacture and install.

• Circular shape allows for easier access from any angle.

• Circular manholes have been used for centuries, dating back t...read more

I have 5 years of experience in Boiler Turbine, ESP, and BAG FILTER EPCI projects.

• 5 years of experience in Boiler Turbine projects

• Familiar with ESP (Electrostatic Precipitator) systems

• Proficient in BAG FILTER EPCI (Engineering, Procurement, Construction, and Installation)

• Managed various projects involving Boiler Turbine, ESP, and BAG FILTER systems

• Implemented cost-effective solutions for improving efficiency

The 5 process types are continuous, batch, job shop, project, and line.

• Continuous process involves uninterrupted flow of production, like in oil refineries.

• Batch process produces a group of products at one time, like in pharmaceuticals.

• Job shop process is customized and flexible, like in machine shops.

• Project process is unique and temporary, like in construction projects.

• Line process is repetitive and standardized, like in assembly lines.

I have studied various subjects in mechanical engineering including thermodynamics, mechanics, materials science, and design.

• Studied thermodynamics to understand energy transfer and conversion

• Learned mechanics to analyze and design mechanical systems

• Explored materials science to understand the properties and behavior of materials

• Focused on design to develop creative and effective solutions to engineering problems

Reduction and convection are processes commonly used in heat transfer and fluid dynamics.

• Reduction is the process of decreasing the size or amount of something, such as reducing the diameter of a pipe or decreasing the pressure in a system.

• Convection is the transfer of heat through the movement of a fluid, such as air or water, due to differences in temperature and density.

• Reduction can be achieved through various methods like using reducers, valves, or throttling devices.

• Con...read more

The types of maintenance for construction machinery include preventive, corrective, and predictive maintenance.

• Preventive maintenance involves regularly scheduled inspections, cleaning, and servicing to prevent breakdowns and extend the lifespan of the machinery.

• Corrective maintenance is performed when a machine breaks down or malfunctions, and it involves repairing or replacing faulty components.

• Predictive maintenance uses data analysis and monitoring techniques to predict w...read more

Breakdowns can be handled by identifying the root cause, performing maintenance, and implementing preventive measures.

• Identify the root cause of the breakdown

• Perform maintenance on the machine

• Implement preventive measures to avoid future breakdowns

• Regularly inspect and maintain the machine

• Train operators on proper usage and maintenance

• Keep spare parts on hand for quick repairs

• Establish a maintenance schedule

• Monitor machine performance and address any issues promptly

Utilize automation, streamline processes, prioritize tests, and use simulation software.

• Implement automation for repetitive tasks to save time.

• Streamline testing processes to eliminate inefficiencies.

• Prioritize tests based on criticality to focus on the most important ones first.

• Utilize simulation software to conduct virtual testing and reduce physical testing time.

The list count of vanear calliper is the number of items in the vanear calliper list.

• The list count can be obtained by using the 'count' function or by iterating through the list and counting the number of items.

• For example, if the vanear calliper list contains 5 items, the list count would be 5.

Centrifugal pumps and positive displacement pumps are commonly used for slurry disposal.

• Centrifugal pumps are often used for transporting large volumes of slurry with low viscosity.

• Positive displacement pumps are suitable for handling high viscosity slurry or slurry with solid particles.

• Examples of pumps used for slurry disposal include centrifugal slurry pumps and progressive cavity pumps.

Spark engine uses spark plugs to ignite fuel while compression engine compresses fuel to ignite it.

• Spark engine uses spark plugs to ignite fuel while compression engine compresses fuel to ignite it.

• Spark engine is used in gasoline/petrol vehicles while compression engine is used in diesel vehicles.

• Spark engine has lower compression ratio while compression engine has higher compression ratio.

• Spark engine has lower efficiency while compression engine has higher efficiency.

• Spark...read more

TEMA is a standard for designing and manufacturing heat exchangers. Heat exchanger maintenance involves cleaning, inspection, and repair.

• TEMA stands for Tubular Exchanger Manufacturers Association

• It provides standards for the design and manufacture of heat exchangers

• Heat exchanger maintenance involves cleaning the tubes and shell, inspecting for leaks and corrosion, and repairing any damage

• Regular maintenance can improve efficiency and prolong the life of the heat exchanger

Tolerance zone for perpendicularity in GD&T is the allowable range within which a feature can deviate from being perfectly perpendicular.

• Tolerance zone for perpendicularity is a 2D cylindrical tolerance zone that is perpendicular to a datum plane.

• It is represented by two parallel planes that are a specified distance apart.

• The feature must fall within this zone to be considered perpendicular.

• The tolerance value specifies the allowable deviation from perfect perpendicularity.

• Fo...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. A CNC machine is a computer-controlled machine tool used for cutting various materials.

• Transformers are used to step up or step down voltage levels in electrical circuits.

• CNC machines use computer programs to control the movement of cutting tools.

• Transformers are commonly used in power distribution systems.

• CNC machines are used in manufacturin...read more

Design inputs for s&t heat exchanger

• Fluid type and flow rate

• Temperature range and desired heat transfer rate

• Pressure drop limitations

• Material selection for tubes and fins

• Space and weight constraints

• Environmental factors such as corrosion and fouling

• Operating conditions and maintenance requirements

Regular maintenance, timely inspections, proper training for operators, using quality parts and components.

• Regularly schedule maintenance checks to identify and address potential issues before they lead to breakdowns.

• Train operators on proper vehicle usage and maintenance procedures to prevent unnecessary wear and tear.

• Use high-quality parts and components during repairs to ensure longevity and reliability of the vehicle.

• Conduct timely inspections to detect any signs of wear ...read more

IMEG's reputation for innovative projects and collaborative work environment aligns with my career goals and values.

• IMEG's focus on sustainable engineering solutions resonates with my passion for environmental conservation.

• I am impressed by IMEG's diverse portfolio of projects, ranging from healthcare facilities to educational institutions.

• IMEG's commitment to professional development and mentorship programs is something I value in a potential employer.

There are three types of lubrication: boundary, mixed, and hydrodynamic.

• Boundary lubrication occurs when there is direct contact between two surfaces and a lubricant is used to reduce friction.

• Mixed lubrication is a combination of boundary and hydrodynamic lubrication.

• Hydrodynamic lubrication occurs when a fluid film is created between two surfaces, reducing friction and wear.

• Examples of lubricants include oil, grease, and graphite.

• The type of lubrication used depends on the ...read more