200+ Diploma Mechanical Engineer Interview Questions and Answers

The second law of thermodynamics states that the entropy of an isolated system always increases over time.

• Entropy of an isolated system always increases

• Heat cannot spontaneously flow from a colder body to a hotter body

• Efficiency of a heat engine is always less than 100%

• Examples: melting ice, burning wood

Thermodynamics, stress and strain determination, manufacturing processes, CAD software proficiency, IC engine operation, Otto cycle explanation

• Basic principles of thermodynamics involve energy transfer and conversion, entropy, and the laws of thermodynamics

• Stress in a material is determined by dividing the applied force by the cross-sectional area, while strain is the ratio of the change in length to the original length

• Types of manufacturing processes include casting, machini...read more

Pumps are devices used to move fluids from one place to another. They are classified based on their working principle and application.

• Pumps can be classified as positive displacement pumps and dynamic pumps.

• Positive displacement pumps move a fixed amount of fluid with each stroke or rotation. Examples include reciprocating pumps and rotary pumps.

• Dynamic pumps use velocity to move fluids. Examples include centrifugal pumps and axial flow pumps.

• Pumps can also be classified base...read more

Surge tank

• A surge tank is used to protect the penstock from sudden variations in flow or velocity of water.

• It absorbs the excess pressure caused by sudden changes in flow and prevents damage to the penstock.

• Surge tanks are typically installed in hydropower plants and water distribution systems.

• They help maintain a steady flow of water and prevent water hammer effects.

• Examples of surge tanks include open surge tanks, closed surge tanks, and standpipe surge tanks.

The longest river in the world is the Nile River.

• The Nile River is located in northeastern Africa.

• It flows through multiple countries including Egypt, Sudan, South Sudan, and Ethiopia.

• The Nile River has two main tributaries, the White Nile and the Blue Nile.

• It is approximately 6,650 kilometers (4,130 miles) long.

The only body part that is fully grown from birth is the eye.

• The eye is the only body part that is fully developed at birth and does not grow in size as we age.

• Other body parts such as the brain, lungs, and heart continue to grow and develop after birth.

• The size of the eye remains relatively constant throughout our lifetime.

• This is why babies are born with fully functional eyesight.

Excel is a spreadsheet program used for data analysis and MLA stands for Modern Language Association.

• Excel is a software application developed by Microsoft that allows users to create, organize, and analyze data using spreadsheets.

• MLA is a style guide used for writing and documenting research papers in the fields of humanities and liberal arts.

• ASALI and Emily are not related to Excel or MLA. It seems like there might be a misunderstanding or miscommunication in the question.

The 4 main components of material science are structure, properties, processing, and performance.

• Structure: The arrangement of atoms and molecules in a material.

• Properties: The characteristics of a material, such as strength, hardness, and conductivity.

• Processing: The methods used to shape and form materials, like casting, forging, and machining.

• Performance: How a material behaves under specific conditions, including its durability and reliability.

Benson Boiler is a type of boiler that does not require a steam drum.

• Benson Boiler is a high-pressure, water tube boiler.

• It operates at supercritical pressure.

• The water is heated in a single pass through the evaporator tubes.

• It is commonly used in power plants.

• Examples include the Lethabo, Majuba, and Kendal power stations in South Africa.

The hydro test pressure of an equipment connection is the pressure at which the connection is tested for leaks and strength.

• Hydro test pressure is determined based on the design and operating conditions of the equipment.

• It is usually expressed in units of pressure, such as psi or bar.

• The test pressure should be higher than the maximum operating pressure to ensure the connection's integrity.

• The test pressure may vary depending on the type of equipment and its intended use.

• For ...read more

Yes, there are many types of valves including ball, gate, globe, butterfly, check, and needle valves.

• Valves are used to control the flow of fluids or gases in a system.

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

• Gate valves have a flat closure unit that slides into place to stop flow.

• Globe valves have a spherical closure unit that moves up and down to regulate flow.

• Butterfly valves have a disc-shaped closure unit that rotates to control flow.

• Check...read more

Cranksoft is not a specific type of material.

• Cranksoft is not a recognized material in the field of mechanical engineering.

• It is possible that Cranksoft is a fictional or made-up material.

• Without further information, it is not possible to determine the properties or characteristics of Cranksoft.

Shaft balancing in accordance with ISO 21940-11 and ISO 21940-12 standards involves reducing vibrations by adjusting the mass distribution along the shaft.

• Shaft balancing aims to minimize vibrations in rotating machinery by adjusting the mass distribution along the shaft.

• ISO 21940-11 specifies the balancing process for rigid rotors, while ISO 21940-12 covers the balancing of flexible rotors.

• Balancing involves adding or removing weight from specific locations on the shaft to a...read more

A car's wheel and axle system is a simple machine that allows the car to move efficiently.

• The wheel and axle system consists of a wheel (the round part) attached to an axle (the rod that goes through the center of the wheel).

• When the axle rotates, it causes the wheel to turn, allowing the car to move forward or backward.

• The wheel and axle system reduces friction and makes it easier for the car to move.

• An example of a wheel and axle system in a car is the wheels attached to th...read more

Investigate the root cause of the deviation and take corrective actions to ensure the target is met in future shifts.

• Analyze the production process to identify any bottlenecks or inefficiencies causing the deviation.

• Check if there were any machine breakdowns or maintenance issues affecting the production output.

• Review the raw material quality and availability to ensure they meet the required standards.

• Evaluate the performance of the workforce to see if additional training or ...read more

An engine is a machine that converts fuel into mechanical energy to power a vehicle or machinery.

• Engines come in various types such as internal combustion, diesel, electric, and hybrid.

• They are used in cars, trucks, airplanes, boats, and generators.

• The engine consists of various components such as cylinders, pistons, crankshaft, and camshaft.

• The engine's power output is measured in horsepower or kilowatts.

• Regular maintenance is required to keep the engine running efficiently.

Setting up belt conveyors, rollers, and gearboxes involves proper alignment, tensioning, and lubrication.

• Ensure proper alignment of the belt conveyor, rollers, and gearboxes to prevent misalignment issues.

• Tension the belt properly to ensure it is not too loose or too tight, which can affect the conveyor's performance.

• Regularly lubricate the rollers and gearboxes to reduce friction and prevent wear and tear.

• Check for any signs of damage or wear on the belt, rollers, and gearbo...read more

The number of manpower needed for a 1 MW site in one day completion depends on various factors such as the complexity of the project, equipment availability, and skill level of the workers.

• Number of manpower required will vary based on the type of work (installation, maintenance, etc.)

• Availability of equipment like cranes, trucks, and tools will impact manpower needs

• Skill level of workers will determine efficiency and speed of work

• For example, a simple installation project ma...read more

I will analyze my performance, identify areas for improvement, and create a plan to reach the target of 100.

• Analyze the reasons for not reaching the target score of 100

• Identify areas for improvement such as time management, study habits, or understanding of the material

• Create a plan with specific goals and actions to improve performance

• Seek feedback from teachers or mentors for guidance and support

Machines are mechanical devices that use energy to perform tasks. Gears are mechanical components that transmit power and motion.

• Machines are used to make work easier by using energy to perform tasks

• Mechanical engineering involves designing, analyzing, and manufacturing machines and mechanical systems

• Gears are mechanical components that transmit power and motion between rotating shafts

• They are used in many machines, such as cars, bicycles, and industrial equipment

• Different ty...read more

Our company specializes in manufacturing various mechanical components and equipment.

• We produce a wide range of mechanical components such as gears, shafts, and bearings.

• We manufacture equipment like pumps, compressors, and turbines.

• Our production also includes specialized machinery for industries like automotive, aerospace, and energy.

• We have expertise in precision machining, welding, and assembly processes.

• Our manufacturing capabilities enable us to meet the specific requir...read more

Main parts of an IC engine include cylinder, piston, crankshaft, connecting rod, spark plug, and intake/exhaust valves.

• Cylinder: Houses the piston and combustion process

• Piston: Moves up and down in the cylinder to create power

• Crankshaft: Converts linear motion of the piston into rotational motion

• Connecting rod: Connects the piston to the crankshaft

• Spark plug: Ignites the air-fuel mixture in the cylinder

• Intake/exhaust valves: Control the flow of air-fuel mixture in and exhaust...read more

The least count of a measuring instrument is the smallest value that can be measured with it.

• The least count of a vernier caliper is typically 0.02 mm.

• The least count of a micrometer is typically 0.01 mm.

• The least count of a steam turbine depends on the specific turbine and its design.

CC stands for Carbon Copy, which is a copy of a document made by using carbon paper.

• CC is used to make a duplicate copy of a document without the need for a photocopier or printer.

• Carbon paper is placed between the original document and the copy paper, and pressure is applied to transfer the ink.

• CC is commonly used in offices for making copies of letters, invoices, and other documents.

• It is also used in art for transferring sketches or designs onto different surfaces.

• CC can a...read more

Propeller shaft transmits power from engine to the wheels of a vehicle.

• It connects the transmission to the rear axle.

• It rotates at high speeds and needs to be balanced.

• It may have universal joints to allow for suspension movement.

• It may have a slip joint to allow for changes in length due to suspension movement.

• It may be made of steel or aluminum depending on the application.

If there is a defect in the product, it is important to identify the root cause, rectify the issue, and implement preventive measures.

• Identify the root cause of the defect through thorough analysis and testing

• Rectify the issue by repairing or replacing the defective parts

• Implement preventive measures to avoid similar defects in the future, such as improving quality control processes or training staff

• Communicate with relevant stakeholders about the defect and the steps taken t...read more

Piston rings are components in an engine that seal the combustion chamber and prevent leakage of gases.

• Piston rings are circular metal rings that fit into grooves on the outer diameter of the piston.

• They provide a seal between the piston and the cylinder wall, preventing the combustion gases from leaking into the crankcase.

• Piston rings also help to regulate the oil distribution on the cylinder walls, ensuring proper lubrication.

• They assist in transferring heat from the piston...read more