200+ 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

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 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

The process before starting Exchanger work involves several steps.

• Inspecting the exchanger for any damages or leaks

• Checking the pressure and temperature gauges

• Ensuring all valves and controls are in the correct position

• Verifying that the exchanger is properly isolated from the system

• Performing a safety check and obtaining necessary permits

• Preparing the necessary tools and equipment for the work

• Following proper lockout/tagout procedures

• Communicating with other team members and...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

A centrifugal pump is a mechanical device used to transport fluids by converting rotational kinetic energy into hydrodynamic energy.

• Centrifugal pumps are commonly used in various industries, including oil and gas, water treatment, and HVAC systems.

• They work by using an impeller to rotate and create a centrifugal force, which pushes the fluid towards the pump outlet.

• The fluid enters the pump through the suction inlet and is accelerated by the impeller, increasing its velocity ...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

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

Maintaining clean and lubricated equipment is essential for optimal performance and longevity in mechanical systems.

• Regular Cleaning Schedule: Establish a routine cleaning schedule to remove dirt and debris from equipment surfaces, ensuring optimal performance.

• Use Appropriate Cleaning Agents: Select cleaning agents that are suitable for the specific materials of the equipment to avoid damage; for example, using solvent-based cleaners for metal parts.

• Lubrication Intervals: Fol...read more

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

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.

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.

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

Isolate the line, close the valve, and remove the bolts safely and systematically to ensure proper maintenance.

• Identify the correct line to isolate before starting work.

• Ensure the valve is fully closed to prevent leaks.

• Use appropriate tools to remove the bolts, such as a wrench or socket set.

• Follow safety protocols, including wearing gloves and goggles.

• Check for any residual pressure in the system before proceeding.

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.

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