60+ Mechanical Engineer Interview Questions and Answers for Freshers

The interview question covers various topics related to mechanical engineering such as thermodynamics, bearing block size calculation, belt conveyor and bucket elevator types, dial gauge and its parts, crasher types, bearing sleeve, and filler gauge.

• Thermodynamics law

• Calculation of bearing block size

• Types of belt conveyor and bucket elevator

• Dial gauge and its parts

• Crasher types

• Bearing sleeve

• Filler gauge lowest count

Earth is the planet where human beings live.

• Human beings live on planet Earth.

• Earth is the third planet from the Sun in our solar system.

• It is the only known planet to support life.

• Earth has a diverse range of ecosystems and environments that sustain human life.

• Examples of Earth's features include oceans, mountains, forests, and deserts.

The Pacific Ocean is the largest ocean in the world.

• The Pacific Ocean covers an area of about 63 million square miles.

• It is larger than all the other oceans combined.

• It stretches from the Arctic Ocean in the north to the Southern Ocean in the south.

• The Pacific Ocean is home to numerous islands, including Hawaii and Easter Island.

Gears are mechanical components that transmit power and motion between rotating shafts. There are various types of gears.

• Spur gears are the most common type and have straight teeth.

• Helical gears have angled teeth and provide smoother operation.

• Bevel gears transmit power between shafts that are not parallel.

• Worm gears have a screw-like thread and are used for high reduction ratios.

• Planetary gears have a central gear that rotates around other gears.

• Rack and pinion gears convert...read more

Electric motor production started in the late 19th century and has since evolved with advancements in technology.

• Electric motor production began in the late 19th century.

• The first practical electric motor was developed by Thomas Davenport in 1834.

• Advancements in technology have led to the development of more efficient and powerful electric motors.

• Electric motor production has grown significantly with the rise of electric vehicles and renewable energy sources.

The center of gravity of a vehicle shifts towards the outside of the turn, causing a lateral force.

• The lateral force causes the vehicle to lean towards the inside of the turn.

• The speed of the turn and the height of the center of gravity affect the amount of lateral force.

• If the center of gravity is too high, the vehicle may tip over.

• Anti-roll bars and suspension systems can help reduce the lateral force and improve stability.

Power from engine is transmitted to vehicle through a transmission system which converts engine power into rotational force for the wheels.

• The engine generates power which is transferred to the transmission system

• The transmission system converts the power into rotational force for the wheels

• The wheels then propel the vehicle forward

• Different types of transmission systems include manual, automatic, and continuously variable transmissions

A centrifugal pump is a mechanical device that uses centrifugal force to transport fluids. There are two types: radial and axial.

• Centrifugal pumps are commonly used in industrial and domestic applications.

• Radial pumps have a volute casing and are used for low flow and high head applications.

• Axial pumps have a propeller and are used for high flow and low head applications.

• Centrifugal pumps are easy to install and maintain.

• They are not suitable for high viscosity fluids or flui...read more

Seam welding is a process of joining two metal sheets by creating a continuous seam along the joint. Bending of pipes is the process of shaping pipes into desired angles or curves. Welding materials are the materials used in welding processes.

• Seam welding is commonly used in the automotive and aerospace industries.

• Bending of pipes is done using specialized tools like pipe benders.

• Welding materials include filler metals, fluxes, and shielding gases.

• The choice of welding materi...read more

The distance between two supports in a single run pipe depends on the material, size, and weight of the pipe.

• The distance between supports for steel pipes is typically 10-12 feet.

• For PVC pipes, the distance can be shorter, around 4-5 feet.

• Consider factors like pipe material, size, weight, temperature, and pressure when determining support spacing.

Types of boilers include fire tube, water tube, and electric boilers. ESP is a device used to remove particles from exhaust gas. Thermodynamic cycles include Carnot, Rankine, and Brayton cycles.

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

• ESP: device to remove particles from exhaust gas

• Thermodynamic cycles: Carnot, Rankine, Brayton

Proper environment, rules and regulations are necessary for safety, efficiency and productivity.

• Proper environment ensures the safety of workers and equipment.

• Rules and regulations ensure compliance with legal and ethical standards.

• Proper environment, rules and regulations promote efficiency and productivity.

• Lack of proper environment, rules and regulations can lead to accidents, injuries, and loss of productivity.

• Examples include lack of safety equipment, inadequate ventilat...read more

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

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

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

The solar system refers to the sun and all the celestial objects that orbit around it. There are two types: ongrid and offgrid systems.

• The solar system consists of the sun, planets, moons, asteroids, comets, and other celestial bodies.

• Ongrid systems are connected to the main electrical grid and feed excess energy back into the grid.

• Offgrid systems are not connected to the main grid and rely on batteries or other storage methods to store excess energy.

• Ongrid systems are common...read more

I would ensure your medical insurance is properly managed and utilized.

• Review the coverage provided by the insurance plan

• Ensure timely payment of premiums to avoid any lapses in coverage

• Keep track of medical expenses and file claims accurately

• Stay informed about any changes in the insurance policy or network providers

SI and CI engines are types of internal combustion engines used in vehicles and machinery.

• SI engine stands for Spark Ignition engine, also known as gasoline engine.

• CI engine stands for Compression Ignition engine, also known as diesel engine.

• SI engines use a spark plug to ignite the fuel-air mixture, while CI engines use compression to ignite the fuel.

• SI engines are commonly used in cars, motorcycles, and small machinery, while CI engines are used in larger vehicles and machi...read more

Prandtl number is a dimensionless number used in fluid mechanics to describe the ratio of momentum diffusivity to thermal diffusivity.

• It is named after the German physicist Ludwig Prandtl.

• It is used to predict fluid flow behavior and heat transfer in different materials.

• It is calculated as the ratio of kinematic viscosity to thermal diffusivity.

• It is important in the study of boundary layers, turbulence, and convection.

• For example, air has a Prandtl number of approximately 0....read more

1 mm is equal to 1000 microns.

• 1 mm = 1000 microns

• Micron is a unit of length equal to one millionth of a meter

• Used in measuring very small distances in engineering and science

Triangular structure is more stable due to its inherent strength and ability to distribute weight evenly.

• Triangular structures distribute weight evenly, reducing stress on individual components.

• They are inherently strong due to their shape, which allows for better load-bearing capacity.

• Examples include the Eiffel Tower and suspension bridges.

• Rectangular structures are less stable as they are more prone to buckling and bending under stress.

My salary expectation is in line with industry standards and commensurate with my experience and qualifications.

• I have researched the average salary range for this position in this industry

• I am open to negotiation based on the specific responsibilities and benefits offered

• I am looking for fair compensation that reflects my skills and experience

• I am also interested in opportunities for growth and advancement within the company

Analyzed thermal performance of parabolic solar collector for M.Tech project

• Researched various materials for collector construction

• Conducted experiments to measure heat transfer efficiency

• Analyzed data to optimize collector design

• Compared results with theoretical models

• Presented findings in a detailed report

Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature.

• Bearings can be of various types such as ball bearings, roller bearings, sleeve bearings, etc.

• Fans can be of different types such as axial fans, centrifugal fans, etc.

• Thermal expansion can cause changes in the dimensions of the bearing and fan components, which can affect their performance and lifespan.

• Materials with high coefficients of thermal expansion ar...read more

Improper machine maintenance can lead to breakdowns, reduced efficiency, and safety hazards.

• Lack of lubrication can cause friction and wear on moving parts

• Dirty filters can reduce airflow and cause overheating

• Loose bolts and screws can lead to misalignment and vibration

• Neglecting electrical components can cause shorts and fires

• Ignoring warning signs can result in costly repairs or accidents

• Regular maintenance can prevent breakdowns and prolong machine life

I respond to problems by analyzing the root cause, brainstorming solutions, and implementing the best course of action.

• Identify the problem and gather relevant information

• Brainstorm potential solutions and evaluate their feasibility

• Implement the chosen solution and monitor its effectiveness

• Iterate on the solution if necessary to achieve desired results

Seals: mechanical, hydraulic, pneumatic. Bearings: ball, roller, plain, magnetic, fluid.

• Mechanical seals prevent leakage between two surfaces in relative motion.

• Hydraulic seals prevent leakage of fluid in hydraulic systems.

• Pneumatic seals prevent leakage of gas in pneumatic systems.

• Ball bearings use balls to reduce friction between two surfaces.

• Roller bearings use rollers to reduce friction between two surfaces.

• Plain bearings use a sliding motion to reduce friction between tw...read more

CI engines use compression ignition while SI engines use spark ignition.

• CI engines have higher compression ratios than SI engines.

• CI engines are more fuel efficient but produce more emissions.

• SI engines are used in most cars while CI engines are used in heavy-duty vehicles like trucks and buses.

A chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. An AHU (Air Handling Unit) is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system.

• Chillers are commonly used in commercial and industrial buildings to cool water or other fluids for air conditioning or process cooling.

• AHUs are responsible for conditioning and distributing air throughout a building, ensu...read more

I am involved in designing, analyzing, and improving mechanical systems and components.

• Designing mechanical components and systems

• Analyzing performance of mechanical systems

• Improving efficiency and functionality of mechanical systems

Knocking is a phenomenon where the air-fuel mixture in the engine cylinder ignites spontaneously before the spark plug fires.

• Knocking is also known as detonation or pinging.

• It can cause engine damage if not addressed.

• It occurs when the air-fuel mixture in the cylinder ignites prematurely due to high pressure and temperature.

• It can be caused by low-quality fuel, incorrect ignition timing, or engine overheating.

• To prevent knocking, use high-quality fuel, maintain proper ignitio...read more

ACC Infratech is a construction company specializing in infrastructure projects such as roads, bridges, and buildings.

• ACC Infratech is known for its expertise in constructing high-quality infrastructure projects.

• They have completed projects like highways, flyovers, and industrial buildings.

• The company focuses on using advanced technology and sustainable practices in their construction projects.

Technical issues can be measured through various methods such as data analysis, testing, monitoring, and feedback collection.

• Use data analysis to identify patterns and trends in technical issues.

• Conduct testing to determine the root cause of the problem and measure its impact.

• Implement monitoring systems to track the performance and behavior of the technical issue over time.

• Collect feedback from users or stakeholders to understand the impact of the technical issue on their ex...read more

Gears are mechanical components used to transmit motion and power between rotating shafts. Gear module is the unit of size that defines the gear's dimensions.

• Gears are toothed wheels that mesh with each other to transmit motion and power.

• Gear module is the unit of size that defines the gear's dimensions, such as the tooth size and spacing.

• Gears are used in various mechanical systems, such as in vehicles, machinery, and industrial equipment.

Bernoulli's equation relates the pressure, velocity, and height of a fluid in motion.

• Bernoulli's equation is based on the principle of conservation of energy.

• It is commonly used in fluid mechanics to analyze the flow of fluids through pipes and channels.

• The equation states that as the velocity of a fluid increases, its pressure decreases, and vice versa.

• It can be expressed as P + 1/2ρv^2 + ρgh = constant, where P is pressure, ρ is density, v is velocity, g is acceleration due...read more

SBI's working process involves customer transactions, loan processing, investment management, and financial services.

• Customer transactions include deposits, withdrawals, and fund transfers.

• Loan processing involves evaluating applications, credit checks, and disbursing funds.

• Investment management includes offering various investment options like mutual funds, insurance, and fixed deposits.

• Financial services provided by SBI include wealth management, insurance products, and ret...read more

Vernier caliper least count is the smallest measurement that can be read on the scale of the caliper.

• The least count of a Vernier caliper is typically 0.02 mm or 0.001 inches.

• It is determined by dividing the smallest division on the main scale by the number of divisions on the Vernier scale.

• For example, if the main scale has divisions of 1 mm and the Vernier scale has 50 divisions, the least count would be 0.02 mm.

• The least count is important for accurately measuring small di...read more

Introduction procedure for interviewer

• Greet the interviewer with a firm handshake and a smile

• Introduce yourself with your name and background briefly

• Express your enthusiasm for the opportunity

• Thank the interviewer for the opportunity to interview

• Ask if they would like you to provide any additional information

Gear ratio is calculated by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.

• Gear ratio = Number of teeth on driven gear / Number of teeth on driving gear

• For example, if the driven gear has 30 teeth and the driving gear has 10 teeth, the gear ratio would be 30/10 = 3.

Automation engineering involves designing, developing, and implementing systems that can operate with minimal human intervention.

• Automation engineering focuses on creating automated systems to improve efficiency and productivity.

• It involves designing and programming machines and processes to perform tasks without human intervention.

• Examples include automated assembly lines, robotic systems, and industrial control systems.

• Automation engineers work with various technologies suc...read more

Automobile engineering is the branch of engineering that deals with the design, development, and production of vehicles.

• It involves the study of various components of automobiles such as engines, transmissions, brakes, and suspension systems.

• Automobile engineers work on improving fuel efficiency, safety features, and overall performance of vehicles.

• They also focus on reducing emissions and developing alternative fuel sources.

• Examples of automobile engineering projects include...read more

Utility equipments are essential for smooth operation of industrial processes.

• Utility equipments provide necessary support to primary equipments.

• They ensure uninterrupted supply of utilities like power, water, steam, compressed air, etc.

• They help in maintaining the quality and efficiency of the primary equipments.

• Examples include boilers, chillers, pumps, compressors, cooling towers, etc.

Basic academic qualifications for a Mechanical Engineer include a bachelor's degree in Mechanical Engineering or related field.

• Bachelor's degree in Mechanical Engineering

• Strong background in math and physics

• Knowledge of CAD software

• Internships or co-op experiences

• Continuing education or certifications

Production is the process of creating goods and services using resources and labor.

• It involves designing, planning, and executing the manufacturing or service delivery process.

• It includes sourcing raw materials, assembling components, and testing the final product.

• Efficient production leads to increased profitability and customer satisfaction.

• Examples include car manufacturing, food processing, and software development.

Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy.

• Thermodynamics studies the transfer of energy in the form of heat and work.

• It involves concepts like entropy, temperature, and energy conversion.

• Examples include the efficiency of engines, refrigeration systems, and phase transitions in materials.

Maintenance planning involves scheduling regular inspections, identifying potential issues, prioritizing tasks, and allocating resources efficiently.

• Create a maintenance schedule based on equipment manufacturer recommendations

• Conduct regular inspections to identify potential issues before they become major problems

• Prioritize maintenance tasks based on criticality and impact on production

• Allocate resources such as manpower, tools, and spare parts efficiently

• Utilize predictive ...read more