900+ Mechanical Engineer Interview Questions and Answers

If pressure valve fails in boiler, shut down the boiler immediately and isolate it from the system.

• Shut down the boiler immediately to prevent any further damage.

• Isolate the boiler from the system to prevent any pressure build-up.

• Inspect the pressure valve to determine the cause of failure.

• Replace the pressure valve with a new one.

• Test the new pressure valve to ensure it is functioning properly before restarting the boiler.

An aeroplane consists of several basic parts that work together to enable flight.

• The wings generate lift and provide stability

• The fuselage houses the cockpit, passengers, and cargo

• The engines provide thrust to move the plane forward

• The tail section includes the horizontal stabilizer and vertical fin for directional control

• The landing gear allows the plane to take off and land

• The avionics system includes instruments and electronics for navigation and communication

The percentage of carbon presence in cast iron varies from 2.1% to 6.67% depending on the type of cast iron.

• Cast iron is classified into four types based on its carbon content: white, gray, ductile, and malleable.

• White cast iron has the highest carbon content, ranging from 2.1% to 6.67%.

• Gray cast iron has a lower carbon content, ranging from 2.5% to 4%.

• Ductile cast iron has a carbon content of 3.2% to 4.1%.

• Malleable cast iron has the lowest carbon content, ranging from 2.2% t...read more

Petrol engines have lower compression ratios compared to diesel engines.

• Petrol engines have lower compression ratios to prevent knocking or detonation.

• Diesel engines have higher compression ratios to ignite the fuel without spark plugs.

• Higher compression ratios in diesel engines result in better fuel efficiency and torque.

• Petrol engines require lower compression ratios to accommodate the lower octane rating of petrol fuel.

• Lower compression ratios in petrol engines allow for s...read more

The exact number of sensors in Maruti Suzuki is not publicly available.

• Maruti Suzuki uses various sensors in their vehicles for different purposes such as airbag sensors, ABS sensors, temperature sensors, etc.

• The number of sensors used in a particular model of Maruti Suzuki may vary depending on the features and technology used.

• The exact number of sensors used in Maruti Suzuki is not disclosed by the company.

• However, it can be assumed that Maruti Suzuki uses a significant num...read more

I know software's like AutoCAD, SolidWorks, ANSYS, MATLAB, and their working algorithms.

• AutoCAD - used for 2D and 3D design and drafting

• SolidWorks - used for 3D modeling and simulation

• ANSYS - used for finite element analysis and computational fluid dynamics

• MATLAB - used for numerical computing and data analysis

Shutdown maintenance is planned maintenance while breakdown maintenance is unplanned.

• Shutdown maintenance is scheduled and planned in advance to minimize downtime.

• Breakdown maintenance is reactive and performed after a failure has occurred.

• Shutdown maintenance involves inspecting, repairing, and replacing equipment before it fails.

• Breakdown maintenance involves repairing or replacing equipment after it has failed.

• Shutdown maintenance is usually more cost-effective than breakd...read more

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

Vehicle parts can be classified into several categories based on their function and location.

• Engine components: pistons, crankshafts, camshafts, valves

• Transmission parts: gears, clutches, driveshafts

• Suspension components: springs, shock absorbers, control arms

• Braking system parts: brake pads, rotors, calipers

• Electrical components: alternators, starters, batteries

• Exhaust system parts: mufflers, catalytic converters, exhaust pipes

• Body and interior parts: doors, windows, seats, ...read more

Effective communication in a multilingual environment requires adaptability and clarity to ensure understanding among coworkers.

• Use simple English: Speak clearly and avoid jargon to ensure comprehension.

• Visual aids: Utilize diagrams or charts to convey complex ideas visually.

• Learn basic Gujarati phrases: Familiarize yourself with common greetings or terms to build rapport.

• Encourage feedback: Ask coworkers to repeat or summarize to confirm understanding.

• Utilize translation too...read more

Bearings are mechanical components that reduce friction between moving parts.

• Bearings support the load and allow for smooth rotation or linear movement.

• They reduce friction and wear between moving parts.

• Bearings come in various types such as ball bearings, roller bearings, and plain bearings.

• Ball bearings use balls to separate the moving parts and are commonly used in applications like motors and wheels.

• Roller bearings use cylindrical or tapered rollers and are suitable for h...read more

Nitrogen gas is commonly used for hot/live tapping in mechanical engineering.

• Nitrogen gas is inert and non-reactive, making it safe to use in hot/live tapping processes.

• It helps to create a protective atmosphere to prevent explosions or fires.

• Nitrogen gas is readily available and cost-effective.

• Other gases like argon or carbon dioxide can also be used depending on the specific requirements.

Yes, I am willing to work at the Budhni plant despite its remote location.

• I am open to relocating for the job

• I have experience working in remote locations

• I am willing to adapt to the new environment and work culture

• I understand the challenges of working in a remote location and am prepared to face them

The interview question covers various topics related to mechanical engineering including steel properties, speed calculations, drawing, gear box lubricant system, hydraulic power pack, and heat treatment process.

• Steel material properties include strength, ductility, toughness, and corrosion resistance.

• Speed and RPM calculations are important for designing and selecting motors, gears, and other mechanical components.

• AutoCAD is a must-know software for mechanical engineers to c...read more

There are mainly two types of vernier calipers: standard vernier caliper and digital vernier caliper.

• Standard vernier caliper

• Digital vernier caliper

Draft in a boiler refers to the flow of air or gases through the combustion chamber and flue gas passages.

• Draft is created by a difference in pressure between the inside and outside of the boiler.

• It is necessary for proper combustion and efficient operation of the boiler.

• There are two types of draft: natural draft and forced draft.

• Natural draft is created by the buoyancy of hot gases, while forced draft is created by mechanical means such as fans or blowers.

• Draft can be measu...read more

Vernier calipers and micrometers are precision measuring tools used in mechanical engineering.

• Vernier calipers are used to measure dimensions with high accuracy, typically up to 0.02 mm.

• Micrometers are used for even more precise measurements, typically up to 0.001 mm.

• Both tools are commonly used in mechanical engineering for dimensional inspection and quality control.

• Vernier calipers have a sliding scale and a main scale, while micrometers have a screw mechanism for measureme...read more

I have used various types of pipes, such as steel, PVC, and CPVC, in previous fire fighting projects.

• Steel pipes are commonly used for their durability and high temperature resistance.

• PVC pipes are lightweight and easy to install, making them suitable for smaller fire fighting systems.

• CPVC pipes are used in areas where higher temperatures are expected, such as boiler rooms or mechanical rooms.

• Examples of fire fighting projects I have worked on include commercial buildings, in...read more

Enthalpy is the heat content of a system, while entropy is the measure of disorder or randomness in a system.

• Enthalpy is the sum of internal energy and the product of pressure and volume.

• Entropy is the measure of the number of ways energy can be distributed in a system.

• Heat loss in entropy occurs due to the transfer of energy from a hot object to a cold object.

• Entropy always increases in a closed system, leading to a decrease in available energy.

• Enthalpy and entropy are impor...read more

Helical gearboxes are commonly used in the steel industry.

• Helical gearboxes are preferred in the steel industry due to their high efficiency and smooth operation.

• These gearboxes provide better load distribution and reduce noise and vibration.

• They are capable of handling heavy loads and high torque requirements.

• Helical gearboxes are commonly used in steel rolling mills, steel processing plants, and other steel manufacturing equipment.

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

• Petrol engines use spark plugs to ignite the fuel-air mixture, while diesel engines rely on compression to ignite the fuel.

• Petrol engines have a higher power-to-weight ratio compared to diesel engines.

• Diesel engines are more fuel-efficient than petrol engines.

• Petrol engines are typically used in cars, motorcycles, and small vehicles, while diesel engines are commonly found in trucks, buses, and he...read more

The question is about mechanical piping execution, equipment used in refinery sector, alignment and installation, pump operation, ASME standards, and fabrication and erection procedures.

• Mechanical piping execution involves the installation and maintenance of piping systems in industrial settings.

• Equipment used in refinery sector includes pumps, compressors, heat exchangers, and boilers.

• Alignment and installation of piping systems is critical to ensure proper functioning and s...read more

Various methods can be used for railway/road/river crossings depending on the location and other factors.

• Bridges can be built over the crossing

• Tunnels can be dug under the crossing

• Level crossings can be used for roads

• Flyovers can be constructed for roads

• Ferries can be used for river crossings

• Aqueducts can be built for waterways

• Location, traffic volume, and safety considerations must be taken into account when choosing a method

The least count of vernier calipers is the smallest measurement that can be accurately read on the scale.

• The least count is determined by the number of divisions on the main scale and the vernier scale.

• It is calculated by dividing the smallest division on the main scale by the number of divisions on the vernier scale.

• For example, if the smallest division on the main scale is 0.1 mm and the vernier scale has 10 divisions, the least count would be 0.01 mm.

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.

Fans, blowers, and compressors are all devices used to move air or gas, but they differ in their pressure ratios and flow rates.

• Fans are low-pressure devices that move large volumes of air at low speeds.

• Blowers are medium-pressure devices that move moderate volumes of air at moderate speeds.

• Compressors are high-pressure devices that move small volumes of air or gas at high speeds.

• Fans are commonly used in HVAC systems, cooling towers, and computer cooling.

• Blowers are used in ...read more

Open the box labeled 'Apples and Oranges' to determine the correct contents and relabel all boxes accordingly.

• Open the box labeled 'Apples and Oranges'. It must contain either only apples or only oranges.

• If it contains apples, relabel the 'Apples' box to 'Oranges' and the 'Oranges' box to 'Apples and Oranges'.

• If it contains oranges, relabel the 'Oranges' box to 'Apples' and the 'Apples' box to 'Apples and Oranges'.

• This method works because all boxes are incorrectly labeled.