100+ Mechanical Technician Interview Questions and Answers

Answering questions related to confined space job, alignment of pump and motor, types of gaskets and valves, and troubleshooting reciprocating compressor.

• Safety watch is responsible for monitoring the workers inside the confined space and ensuring their safety.

• Alignment of pump and motor can be done using dial indicators or laser alignment tools.

• Different types of gaskets include spiral wound, ring joint, and sheet gaskets. Different types of valves include gate, globe, ball,...read more

There are several types of valves used in mechanical systems.

• Gate valve: used to control the flow of fluid by lifting or lowering a gate

• Ball valve: uses a ball to control the flow of fluid

• Butterfly valve: uses a disc to control the flow of fluid

• Check valve: allows fluid to flow in one direction only

• Globe valve: controls flow by raising or lowering a plug

• Needle valve: uses a long, tapered needle to control flow

• Diaphragm valve: uses a flexible diaphragm to control flow

• Plug valv...read more

A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

• Compressors are commonly used in various industries, such as manufacturing, oil and gas, and refrigeration.

• They are used to compress gases, such as air, natural gas, and refrigerants.

• Examples of compressors include reciprocating compressors, rotary screw compressors, and centrifugal compressors.

• Reciprocating compressors use pistons to compress the gas.

• Rotary screw compressors use t...read more

There are several types of heat exchangers, including shell and tube, plate and frame, and finned tube.

• Shell and tube heat exchangers are the most common type and consist of a shell with tubes inside.

• Plate and frame heat exchangers use thin plates to transfer heat between fluids.

• Finned tube heat exchangers have tubes with fins attached to increase surface area for heat transfer.

• Other types include spiral, double pipe, and air-cooled heat exchangers.

• The type of heat exchanger ...read more

Fuel injection is a system that delivers fuel to the engine. Detecting turbocharger problems involves troubleshooting and testing. Working with team members requires good communication and conflict resolution skills. Supervisors must prioritize tasks and delegate responsibilities.

• Fuel injection delivers fuel to the engine through a series of injectors.

• Turbocharger problems can be detected through troubleshooting and testing, such as checking for leaks or abnormal noises.

• Worki...read more

Productivity can improve by implementing efficient processes, utilizing technology, empowering employees, and fostering a positive work environment.

• Implementing efficient processes can eliminate waste and streamline operations.

• Utilizing technology such as automation and data analysis can optimize workflows and reduce manual effort.

• Empowering employees through training, clear goals, and recognition can increase motivation and efficiency.

• Fostering a positive work environment wi...read more

A shell and tube heat exchanger is a device used to transfer heat between two fluids.

• Consists of a shell (outer vessel) and tubes (inner vessels)

• One fluid flows through the tubes while the other flows around the tubes in the shell

• Heat is transferred from one fluid to the other through the tube walls

• Commonly used in industries such as power generation, chemical processing, and HVAC

• Example: Cooling water in a power plant is heated by steam passing through the tubes

The clearance and volume of a compressor can be measured using various methods.

• Clearance refers to the space between the piston and cylinder head when the piston is at top dead center.

• Volume refers to the amount of air or gas that the compressor can displace in a single stroke.

• Clearance can be measured by using a feeler gauge to determine the gap between the piston and cylinder head.

• Volume can be measured by calculating the displacement of the compressor, which is the product...read more

Positive displacement pump is a type of pump that moves fluid by trapping a fixed amount of it and then forcing it into the discharge pipe.

• Positive displacement pumps operate by trapping a specific volume of fluid and then forcing it into the discharge pipe.

• These pumps are capable of generating high pressures and are used in various industries such as oil and gas, chemical, and food processing.

• Examples of positive displacement pumps include reciprocating pumps, rotary pumps, ...read more

Step up and step down in gearboxes refer to increasing and decreasing speed respectively. This can be achieved through gear ratios.

• Step up refers to increasing speed while step down refers to decreasing speed

• This is achieved through gear ratios which determine the speed of the output shaft relative to the input shaft

• To increase speed, a smaller gear is used on the input shaft and a larger gear on the output shaft

• To decrease speed, a larger gear is used on the input shaft and ...read more

The engine is typically divided into four parts: the intake, compression, combustion, and exhaust.

• The engine is divided into four main parts

• These parts are the intake, compression, combustion, and exhaust

• Each part has its own specific function in the engine's operation

• The intake brings in air and fuel, the compression compresses the mixture, the combustion ignites the mixture, and the exhaust expels the waste gases

• The engine may also have additional parts such as the cooling ...read more

PPE stands for Personal Protective Equipment. It refers to protective clothing, helmets, goggles, or other equipment designed to protect the wearer's body from injury or infection.

• PPE is used in various industries to protect workers from hazards.

• Examples of PPE include safety glasses, gloves, hard hats, respirators, and earplugs.

• PPE should be selected based on the specific hazards present in the workplace.

• Proper training and maintenance of PPE are essential for its effectiven...read more

The number of gearbox motor and compressor alignments varies depending on the specific machinery and requirements.

• The number of gearbox motor and compressor alignments can range from one to multiple, depending on the number of machines and their configurations.

• Each gearbox motor and compressor alignment requires careful measurement and adjustment to ensure proper alignment and efficient operation.

• Examples of alignments include aligning the motor shaft with the gearbox input s...read more

The velocity of the turbine can be measured using a tachometer or by calculating it using the formula V = πDN/60.

• Use a tachometer to measure the velocity of the turbine.

• Calculate the velocity using the formula V = πDN/60, where D is the diameter of the turbine and N is the rotational speed in revolutions per minute (RPM).

• Ensure that the units of measurement are consistent when using the formula.

• Compare the measured or calculated velocity to the expected velocity for the turbi...read more

Positive pumps are used to move fluids by creating a pressure difference.

• Positive displacement pumps

• Centrifugal pumps

• Diaphragm pumps

• Gear pumps

• Piston pumps

• Peristaltic pumps

• Rotary pumps

• Screw pumps

• Vane pumps

An axial flow pump is a type of pump that uses an impeller to create fluid flow parallel to the pump shaft.

• Axial flow pumps are commonly used in applications where large volumes of fluid need to be moved at low to medium pressures.

• They are often used in irrigation systems, drainage systems, and cooling systems.

• The impeller of an axial flow pump has blades that resemble a propeller, which helps in generating the axial flow.

• Unlike centrifugal pumps, axial flow pumps do not chan...read more

Precautions must be taken to ensure safety while opening the pump.

• Ensure that the pump is isolated from the power source.

• Release any pressure in the pump before opening it.

• Wear appropriate personal protective equipment (PPE) such as gloves, goggles, and a face shield.

• Follow the manufacturer's instructions for opening the pump.

• Use proper tools and equipment to avoid damaging the pump or injuring yourself.

• Inspect the pump for any signs of damage or wear before opening it.

• Have a...read more

There are two types of piston rings - oil ring and compression ring.

• Oil ring is responsible for regulating the amount of oil that lubricates the cylinder walls.

• Compression ring seals the combustion chamber and prevents gases from escaping.

• Oil ring is located at the bottom of the piston while compression ring is located at the top.

• Both types of rings are made of high-strength materials like cast iron or steel.

• Proper maintenance of piston rings is crucial for engine performance...read more

There are three types of piston rings: compression rings, oil control rings, and wiper rings.

• Compression rings seal the combustion chamber and prevent gases from escaping.

• Oil control rings regulate the amount of oil on the cylinder walls.

• Wiper rings scrape excess oil from the cylinder walls.

I have experience in maintenance, repair, and troubleshooting of mechanical equipment in offshore oil and gas platforms.

• Maintenance and repair of pumps, compressors, and turbines

• Troubleshooting of hydraulic and pneumatic systems

• Experience in working with safety protocols and regulations

• Familiarity with preventive maintenance programs

• Knowledge of equipment installation and commissioning

• Experience in working with rotating equipment

• Experience in working with control systems

• Exper...read more

Yes, I have ridden a Yamaha motorcycle before.

• I have experience riding Yamaha motorcycles.

• I am familiar with the handling and performance of Yamaha motorcycles.

• I have ridden models such as the Yamaha YZF-R6 and Yamaha MT-09.

The three main components of a turbine in the mechanical field are the rotor, stator, and casing.

• Rotor: The rotating part of the turbine that converts the energy of the fluid into mechanical energy.

• Stator: The stationary part of the turbine that directs the flow of the fluid towards the rotor.

• Casing: The outer shell of the turbine that encloses and protects the internal components.

There are several types of hydraulic pumps, including gear pumps, vane pumps, piston pumps, and screw pumps.

• Gear pumps are simple and economical, but not very efficient.

• Vane pumps are more efficient and quieter than gear pumps.

• Piston pumps are highly efficient and can handle high pressures.

• Screw pumps are used for high viscosity fluids and can handle high pressures as well.

The process of opening any joint involves loosening the fasteners and separating the two parts of the joint.

• Identify the type of joint and the fasteners used

• Use appropriate tools to loosen the fasteners

• Separate the two parts of the joint carefully

• Inspect the joint for any damage or wear

• Clean and lubricate the joint before reassembling

Yes, I am familiar with multistage pump maintenance.

• I have experience in disassembling and reassembling multistage pumps.

• I am knowledgeable in inspecting and replacing worn out parts such as impellers and bearings.

• I am skilled in aligning the pump and motor shafts to ensure proper operation.

• I am proficient in troubleshooting and diagnosing issues with multistage pumps.

• I am familiar with performing routine maintenance tasks such as lubrication and cleaning.

• For example, I have ...read more

Pump shaft vibration monitoring is required to ensure smooth operation and prevent damage to the pump and its components.

• Vibration monitoring helps detect any abnormalities in the pump's operation

• Excessive vibration can cause damage to the pump and its components

• Monitoring can help identify the root cause of vibration and prevent future issues

• Regular monitoring can help extend the lifespan of the pump

• Examples of monitoring methods include vibration sensors and analysis softwa...read more

An engine is the power source of a vehicle that converts fuel into mechanical energy.

• An engine is a complex machine that converts fuel into mechanical energy to power a vehicle.

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

• There are different types of engines such as gasoline, diesel, electric, and hybrid.

• Regular maintenance and proper care are essential for the engine's longevity and optimal performance.

A ball valve is a type of valve that uses a ball-shaped disc to control the flow of fluid through a pipe.

• Ball valves are commonly used in industrial applications for their durability and reliability.

• They have a simple design, consisting of a ball with a hole in the middle that can be rotated to control the flow of fluid.

• Ball valves can be either full port or reduced port, depending on the size of the ball and the hole.

• They provide tight shut-off and are often used in applicat...read more

Mechanical isolation refers to the process of physically separating or disconnecting a mechanical component or system from its power source or surrounding environment to ensure safety and prevent unwanted movement or operation.

• Mechanical isolation is used to prevent accidents, injuries, or damage caused by unexpected movement or operation of mechanical equipment.

• It involves the use of physical barriers, locks, or switches to isolate the mechanical component or system from its...read more

Energy conversion in centrifugal pumps involves mechanical energy being converted to kinetic energy and then to potential energy.

• Mechanical energy from the motor is converted to kinetic energy in the rotating impeller

• Kinetic energy is then converted to potential energy in the volute casing

• The potential energy is then used to increase the pressure and flow of the fluid being pumped

• Efficiency of the pump is crucial in minimizing energy losses during these conversions

A globe valve is a type of valve used to regulate or stop the flow of fluid in a pipeline.

• It has a spherical body with an internal baffle that directs the flow of fluid.

• The valve can be opened or closed by rotating the stem.

• It provides a tight seal when closed, preventing leakage.

• Globe valves are commonly used in applications where throttling or regulating flow is required.

• They are often found in water systems, steam systems, and oil and gas pipelines.

Yes, I know how to ride both a bike and a car.

• I have experience riding both bikes and cars.

• I am familiar with the rules of the road and safety precautions for both modes of transportation.

• I have a valid driver's license for both bikes and cars.

• I have ridden different types of bikes such as mountain bikes, road bikes, and motorcycles.

• I have driven various types of cars including sedans, SUVs, and trucks.

The question is unclear and requires clarification.

• Please provide more context or rephrase the question.

• Without additional information, it is impossible to provide a meaningful answer.

• Are you asking about the appearance of a specific object or location?

• Or are you asking about a general observation of the world around us?

• Please clarify the question so that I can provide an appropriate response.

Types of pumps include centrifugal, reciprocating, and rotary pumps. Mechanical seals consist of stationary and rotating parts to prevent leakage.

• Types of pumps: centrifugal, reciprocating, rotary

• Parts of pump: impeller, casing, shaft, bearings

• Types of mechanical seal: pusher, non-pusher, cartridge

• Parts of mechanical seal: stationary ring, rotating ring, secondary seals

• Shaft runout tolerance: typically around 0.05mm

The question is incomplete and unclear.

• The question seems to be asking for a step-by-step process for removing various components of a pump.

• However, the question is incomplete and lacks context.

• It is unclear what type of pump is being referred to and what the purpose of the removal process is.

• Without more information, it is difficult to provide a proper answer.

Motor functions refer to the ability of a motor to perform its intended function. The process involves various steps.

• Motor functions involve the ability of a motor to perform its intended function

• The process includes various steps such as design, assembly, testing, and maintenance

• Examples of motor functions include starting, stopping, accelerating, and decelerating

• The process also involves troubleshooting and repairing any issues that may arise

IBR welding is a type of welding used in high pressure pipes that follows the guidelines set by the Indian Boiler Regulations.

• IBR stands for Indian Boiler Regulations

• IBR welding is a type of welding that follows the guidelines set by the Indian Boiler Regulations

• It is used in high pressure pipes to ensure safety and quality

• The welding process involves preheating the pipes, using specific electrodes, and following strict welding procedures

• IBR welding is mandatory for all high ...read more

Glass line reactor mechanical seal fitting parameters are critical for ensuring proper functioning and preventing leaks.

• The fitting parameters depend on the type of mechanical seal being used.

• Factors such as seal face material, seal face loading, and seal face geometry must be considered.

• Proper installation and alignment of the mechanical seal is also important.

• Regular maintenance and monitoring of the seal is necessary to prevent leaks and ensure longevity.

• Examples of mechan...read more

Backlash in axis refers to the clearance or play between mating components in a mechanical system.

• Backlash is the amount of movement or play between components in a mechanical system.

• It can affect the accuracy and precision of the system.

• Backlash can be minimized by using precision components or adjusting the system properly.

• For example, in a gear system, backlash can cause inaccuracies in positioning if not properly accounted for.

There are several types of safety valves used in mechanical systems.

• Safety valves are used to prevent overpressure in mechanical systems.

• The most common types of safety valves include spring-loaded safety valves, pilot-operated safety valves, and balanced safety valves.

• Spring-loaded safety valves are the simplest type and are commonly used in steam systems.

• Pilot-operated safety valves use a pilot valve to control the opening and closing of the main valve.

• Balanced safety valve...read more

There are three types of alignment: shaft alignment, belt alignment, and gear alignment.

• Shaft alignment involves aligning the rotating shafts of machines to ensure smooth operation and prevent damage.

• Belt alignment refers to aligning the belts in machines such as conveyor systems to prevent slipping and maximize efficiency.

• Gear alignment involves aligning the gears in machines to ensure proper meshing and smooth transmission of power.

MTTR stands for Mean Time to Repair and MTBF stands for Mean Time Between Failures.

• MTTR is the average time it takes to repair a failed component or system.

• MTBF is the average time between two consecutive failures of a component or system.

• MTTR is a measure of repair efficiency, while MTBF is a measure of reliability.

• Handling expensive material in store involves proper inventory management and control.

• Implementing a system to track material usage, minimizing waste, and ensurin...read more

Open spanners have a U-shaped opening while ring spanners have a circular opening.

• Open spanners are used for tightening or loosening nuts and bolts in tight spaces.

• Ring spanners are used for higher torque applications and provide a better grip on the fastener.

• Open spanners are more versatile and can be used on different sizes of nuts and bolts.

• Ring spanners are more durable and less likely to slip off the fastener.

• Open spanners are commonly found in toolkits while ring spanne...read more

There are several types of lagging sheets used in mechanical applications.

• Lagging sheets are used to insulate and protect mechanical equipment.

• Common types of lagging sheets include rubber, ceramic, and metal.

• Rubber lagging sheets are often used for pulleys and conveyor belts.

• Ceramic lagging sheets provide high temperature resistance and are used in boilers and furnaces.

• Metal lagging sheets, such as aluminum or stainless steel, are used for heat exchangers and pipes.

Gas turbine parts include compressor, combustion chamber, turbine, and exhaust system.

• Compressor: compresses air before combustion

• Combustion chamber: where fuel is burned to create hot gases

• Turbine: uses hot gases to turn blades and generate power

• Exhaust system: removes exhaust gases from turbine

• Examples: rotor blades, stator vanes, fuel nozzles, diffusers

A check valve is a mechanical device that allows fluid to flow in one direction only.

• Check valves are commonly used in plumbing systems to prevent backflow of water.

• They are also used in hydraulic systems to prevent reverse flow of fluid.

• Check valves can be classified into different types such as swing check valves, lift check valves, and ball check valves.

• These valves work by using a disc or a ball that opens and closes with the flow of fluid.

• Check valves are typically insta...read more

The least count of a dial gauge is the smallest measurement that can be accurately read on the gauge.

• The least count is determined by the smallest division on the gauge scale.

• It represents the smallest change in measurement that can be detected by the gauge.

• For example, if the smallest division on the dial gauge scale is 0.01 mm, then the least count would be 0.01 mm.

• To measure a length using the dial gauge, the reading should be rounded off to the nearest least count value.