50+ Mechanical Fitter Interview Questions and Answers

Preventive maintenance involves regular inspections, cleaning, lubrication, and replacement of parts to ensure equipment reliability.

• Create a maintenance schedule based on manufacturer recommendations

• Perform regular inspections to identify any signs of wear or damage

• Clean equipment regularly to remove dirt, dust, and debris

• Lubricate moving parts to reduce friction and prevent excessive wear

• Replace worn or damaged parts before they cause equipment failure

• Keep records of mainte...read more

Pressure builds up in a hydraulic valve due to resistance to flow and force exerted by the pump.

• Hydraulic valves control the flow of fluid in a hydraulic system.

• When the valve is closed, the fluid is blocked and pressure builds up behind the valve.

• The pressure builds up due to resistance to flow and force exerted by the pump.

• When the valve is opened, the fluid flows through the valve and the pressure drops.

• The pressure drop is proportional to the flow rate through the valve.

A bearing is a machine element that reduces friction between moving parts and supports axial and radial loads.

• Bearings are used in various machines and equipment such as automobiles, airplanes, and industrial machinery.

• They work by allowing smooth and controlled motion between two surfaces.

• The main parts of a bearing are the outer ring, inner ring, rolling elements, and cage.

• Types of bearings include ball bearings, roller bearings, and plain bearings.

• Proper lubrication is ess...read more

Mechanical seals are used to prevent leakage of fluids in rotating equipment such as pumps and compressors.

• Mechanical seals are used to prevent leakage of fluids in rotating equipment

• They consist of two main components - a stationary part and a rotating part

• The stationary part is fixed to the pump or compressor housing, while the rotating part is attached to the shaft

• The two parts are held together by a spring and a set of secondary seals

• The primary seal is made of a hard mat...read more

Lubrication is essential for equipment and instrument maintenance. The type of lubricant used depends on the equipment and its operating conditions.

• Lubrication reduces friction and wear on moving parts

• Different types of lubricants include oil, grease, and dry lubricants

• The type of lubricant used depends on the equipment's operating conditions, such as temperature and pressure

• Over-lubrication can be just as harmful as under-lubrication

• Regular lubrication maintenance is necessa...read more

A mechanical seal is a device that helps prevent leakage in rotating equipment by creating a barrier between two surfaces.

• Mechanical seals are commonly used in pumps, compressors, and other rotating equipment.

• They consist of two main components: a stationary part and a rotating part.

• The stationary part is typically attached to the pump or equipment housing, while the rotating part is attached to the shaft.

• The two parts are designed to fit together tightly, creating a seal tha...read more

Pay attention to cleanliness, proper disassembly, inspection, and reassembly.

• Ensure cleanliness of the valve and surrounding area.

• Properly disassemble the valve and inspect all components for wear or damage.

• Replace any damaged or worn components with new ones.

• Reassemble the valve carefully, ensuring all components are properly aligned and tightened.

• Test the valve to ensure proper operation before returning it to service.

There are various types of files used in mechanical fitting.

• There are hand files, needle files, and machine files.

• Hand files are used for general purpose filing and come in various shapes and sizes.

• Needle files are used for intricate work and have a pointed end.

• Machine files are used with power tools and have teeth that are cut in a specific pattern.

• Other types of files include diamond files, riffler files, and rotary files.

A pump is a mechanical device used to move fluids from one place to another.

• Pumps are used in various industries such as oil and gas, water treatment, and manufacturing.

• There are different types of pumps including centrifugal pumps, reciprocating pumps, and rotary pumps.

• Centrifugal pumps are commonly used for low viscosity fluids, while reciprocating pumps are suitable for high-pressure applications.

• Examples of pumps include water pumps, fuel pumps, and air compressors.

A centrifugal pump uses rotational energy to move fluids through a system, relying on centrifugal force for fluid movement.

• Consists of an impeller that rotates within a casing.

• Fluid enters the pump at the eye of the impeller and is expelled outward due to centrifugal force.

• Commonly used in water supply systems, HVAC, and chemical processing.

• Examples include submersible pumps and booster pumps.

Manufacturing procedure involves a series of steps to produce a product or component.

• Designing the product or component

• Selecting the materials and tools required

• Creating a prototype

• Testing the prototype for quality and functionality

• Making necessary adjustments and improvements

• Mass production of the product or component

• Quality control checks throughout the manufacturing process

Bearings are used to reduce friction between two moving parts. There are different types of bearings for different applications.

• Bearings reduce friction and wear between two moving parts

• They support radial and axial loads

• Types of bearings include ball bearings, roller bearings, and plain bearings

• Ball bearings are used in high-speed applications

• Roller bearings are used in heavy-duty applications

• Plain bearings are used in low-speed and high-load applications

A bearing is a device that supports and reduces friction between moving parts.

• Bearings are used in various mechanical systems to allow smooth rotation or movement.

• There are different types of bearings such as ball bearings, roller bearings, and plain bearings.

• Ball bearings use balls to reduce friction and allow rotational movement.

• Roller bearings use cylindrical rollers to support heavy loads.

• Plain bearings have a sliding surface and are used in applications where low frictio...read more

A spanner is a type of wrench used to provide grip and mechanical advantage in applying torque to turn objects.

• Spanners come in various types and sizes, including open-end spanners, ring spanners, combination spanners, adjustable spanners, and socket spanners.

• Open-end spanners have U-shaped jaws with a flat surface on one or both sides, allowing them to grip two opposite faces of a nut or bolt.

• Ring spanners have a circular opening at one or both ends, providing a secure grip ...read more

A sine bar is a precision measuring tool used to measure angles.

• Consists of a base, a bar, and a moveable block

• Used in conjunction with a dial indicator to measure angles

• Commonly used in machining and metalworking industries

• Accurate to within a few seconds of a degree

• Can be used to set up workpieces at precise angles for machining operations

Bolts are fasteners used to hold objects together, available in various types for different applications and strengths.

• Hex Bolts: Commonly used in construction, featuring a hexagonal head for easy tightening.

• Carriage Bolts: Rounded head with a square neck, ideal for wood applications.

• Lag Bolts: Heavy-duty bolts used for fastening wood to wood, often used in construction.

• Shoulder Bolts: Have a shoulder that provides a bearing surface, used in machinery.

• Eye Bolts: Feature a loo...read more

There are several types of gears used in mechanical systems.

• Spur gears: used to transmit motion between parallel shafts

• Helical gears: similar to spur gears but with angled teeth for smoother operation

• Bevel gears: used to transmit motion between intersecting shafts

• Worm gears: used for high reduction ratios and self-locking capabilities

• Planetary gears: used in gearboxes to achieve different gear ratios

• Rack and pinion gears: convert rotational motion into linear motion

• Internal g...read more

A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.

• Bearings are used to support rotating shafts and reduce friction between two moving parts.

• There are several types of bearings such as ball bearings, roller bearings, and plain bearings.

• Ball bearings are the most common type of bearing and are used in applications such as electric motors and automotive wheels.

• Roller bearings are used in heavy-duty...read more

Ratio is a mathematical term that compares two or more quantities.

• Ratio is expressed in the form of a:b or a/b.

• It is used to compare two or more quantities of the same kind.

• For example, the ratio of boys to girls in a class of 30 students is 2:3.

• Ratio is used in various fields such as finance, engineering, and science.

A type of reactor is a device used to contain and control a nuclear chain reaction.

• Reactors are used in nuclear power plants to generate electricity.

• There are different types of reactors, such as pressurized water reactors (PWR) and boiling water reactors (BWR).

• Each type of reactor has its own unique design and operating characteristics.

• Reactors require careful monitoring and maintenance to ensure safe and efficient operation.

A strainer is used to separate solids from liquids, while a filter removes impurities from fluids, often at a finer level.

• Purpose: Strainers are primarily used to remove larger particles, such as food debris in cooking, while filters are designed to capture smaller impurities.

• Material: Strainers often have a coarse mesh, like a kitchen colander, whereas filters can be made of paper or fabric, like coffee filters.

• Applications: Strainers are used in cooking and plumbing, while ...read more

A high rpm bearing is a type of bearing designed to operate at high rotational speeds.

• High rpm bearings are typically used in applications such as turbines, motors, and high-speed machinery.

• These bearings are designed with special materials and lubrication systems to handle the increased heat and friction generated at high speeds.

• They often have precision ball or roller elements and advanced cage designs to minimize friction and maximize efficiency.

• Examples of high rpm bearin...read more

Measuring systems in mechanical engineering are used to accurately measure physical quantities such as length, force, pressure, and temperature.

• Measuring systems can be analog or digital.

• Analog measuring systems use a scale and pointer to indicate the measured value.

• Digital measuring systems use electronic sensors to convert physical quantities into digital signals.

• Common types of measuring systems include micrometers, calipers, pressure gauges, and thermometers.

• Measuring sys...read more

My interest lies in working with mechanical systems, troubleshooting and problem-solving, and continuously learning new technologies and techniques.

• Passion for working with mechanical systems

• Enjoy troubleshooting and problem-solving

• Keen interest in learning new technologies and techniques

• Experience in maintaining and repairing machinery

• Enthusiasm for hands-on work

A gear box is a mechanical device that transmits mechanical power from a prime mover to an output device.

• Types of gear box alignments include parallel alignment, angular alignment, and offset alignment.

• Parallel alignment ensures that the shafts of the gears are parallel to each other.

• Angular alignment ensures that the shafts of the gears intersect at a specific angle.

• Offset alignment involves shifting the centerlines of the shafts to accommodate for misalignment.

Heat exchangers are devices used to transfer heat between two or more fluids.

• Shell and tube heat exchanger

• Plate heat exchanger

• Fin tube heat exchanger

• Double pipe heat exchanger

• Spiral heat exchanger

• Air-cooled heat exchanger

A type of component that supports a rotating shaft and reduces friction between moving parts.

• There are several types of bearings, including ball bearings, roller bearings, and plain bearings.

• Ball bearings use balls to reduce friction and support the shaft.

• Roller bearings use cylindrical rollers to support the shaft.

• Plain bearings use a sliding motion to reduce friction and support the shaft.

• Bearings are commonly used in machinery and vehicles to reduce wear and tear on moving...read more