100+ Mechanical Technician Interview Questions and Answers

Yes, the connecting rod is typically made of metal.

• Connecting rods are commonly made of steel or aluminum alloy.

• The choice of material depends on factors such as engine type, power output, and cost.

• Steel rods are stronger but heavier, while aluminum rods are lighter but less durable.

• Some high-performance engines may use titanium connecting rods for their strength and light weight.

There are two types of cylinders: single-acting and double-acting.

• Single-acting cylinders have one port for fluid to enter and exit, and use a spring or other external force to retract the piston.

• Double-acting cylinders have two ports for fluid to enter and exit, and use fluid pressure to both extend and retract the piston.

• Other types of cylinders include telescoping cylinders, rodless cylinders, and rotary cylinders.

• Telescoping cylinders have multiple stages that can extend ...read more

Valves are devices used to control the flow of fluids in a system. There are several types of valves used in mechanical systems.

• Gate valves

• Globe valves

• Ball valves

• Butterfly valves

• Check valves

• Diaphragm valves

• Needle valves

• Pinch valves

Hardness of materials can be found in UTM by applying loads.

• Universal Testing Machine (UTM) is used to measure the hardness of materials.

• The load is applied to the material and the depth of the indentation is measured.

• The hardness value is calculated using the load and the area of the indentation.

• Different types of tests can be performed to measure hardness, such as Brinell, Vickers, and Rockwell tests.

Creep damage in turbo engines can be found through visual inspection, non-destructive testing, and monitoring of engine performance.

• Visual inspection of turbine blades and vanes for cracks, deformations, and discoloration

• Non-destructive testing methods such as ultrasonic testing, X-ray inspection, and eddy current testing

• Monitoring of engine performance through vibration analysis, temperature measurements, and oil analysis

• Regular maintenance and inspection schedules to detect...read more

Designing equipment to remove gas and oil from the ground involves considering factors like extraction methods, safety measures, and environmental impact.

• Consider different extraction methods such as drilling, hydraulic fracturing, or steam injection

• Include safety measures like blowout preventers, emergency shutdown systems, and gas detection sensors

• Address environmental impact by implementing measures to prevent spills, leaks, and contamination

• Design equipment with materials...read more

Yes, I am proficient in operating both CAT electric tools (E.T) and CAT (SIS).

• I have experience in operating CAT electric tools and CAT SIS software.

• I am familiar with the functions and features of both tools.

• I have received training on how to operate and troubleshoot these tools.

• For example, I have used CAT E.T to diagnose and repair electrical issues in heavy machinery.

• I have also used CAT SIS to access parts catalogs and service manuals for maintenance tasks.

Yes, I have experience in overhauling both the transmission and engine.

• I have worked on various types of engines and transmissions, including diesel and gasoline engines, manual and automatic transmissions.

• I am familiar with disassembling, inspecting, repairing, and reassembling engines and transmissions.

• I have experience in using specialized tools and equipment, such as torque wrenches, dial indicators, and micrometers.

• I am knowledgeable in following manufacturer's specifica...read more

There are several types of conveyors used in various industries for transporting goods and materials.

• Belt conveyors are the most common type, consisting of a continuous loop of material that moves on a series of rollers.

• Roller conveyors use rollers to transport items and are often used in warehouses and distribution centers.

• Screw conveyors are used to move bulk materials along a rotating helical screw.

• Chain conveyors use chains to move items and are commonly used in automotiv...read more

There are several types of bearings used in mechanical applications.

• Plain bearings

• Rolling element bearings (ball bearings, roller bearings)

• Thrust bearings

• Sleeve bearings

• Needle bearings

• Tapered roller bearings

• Spherical roller bearings

The two types of pumps are centrifugal pumps and positive displacement pumps.

• Centrifugal pumps use centrifugal force to move fluid through the pump.

• Positive displacement pumps use mechanical action to move fluid through the pump.

• Centrifugal pumps are commonly used in HVAC systems and water supply systems.

• Examples of positive displacement pumps include piston pumps and gear pumps.

A motor operator valve is a type of valve that is operated by an electric motor.

• Motor operator valves are commonly used in industrial applications.

• They are designed to control the flow of fluids or gases.

• Motor operator valves can be used in various systems, such as pipelines, power plants, and manufacturing processes.

• These valves are typically controlled remotely, allowing for automated operation.

• Examples of motor operator valves include ball valves, butterfly valves, and gat...read more

Different types of pumps include centrifugal, reciprocating, and rotary pumps. Pump sealing systems can include mechanical seals, packing seals, and magnetic drive seals. Pump API plans are standardized plans for pump maintenance and troubleshooting.

• Types of pumps: centrifugal, reciprocating, rotary

• Pump sealing systems: mechanical seals, packing seals, magnetic drive seals

• Pump API plans: standardized plans for maintenance and troubleshooting

An engine is a machine that converts fuel into mechanical energy to produce power.

• Engines work by burning fuel to create controlled explosions, which drive pistons or turbines to generate power.

• Different types of engines include internal combustion engines, steam engines, and electric motors.

• Engines require a fuel source, air intake, compression, combustion, and exhaust systems to function properly.

• Examples of engines include gasoline engines in cars, diesel engines in trucks...read more

The firing order of a 4-stroke engine refers to the specific sequence in which each cylinder fires.

• The firing order is determined by the engine design and is crucial for proper engine operation.

• It ensures that each cylinder fires at the correct time in relation to the position of the crankshaft.

• Common firing orders for 4-stroke engines include 1-3-4-2, 1-2-3-4, and 1-4-2-3.

• Incorrect firing order can lead to engine misfires, loss of power, and potential damage.

Yes, I am familiar with hydraulic diagrams.

• I have experience reading and interpreting hydraulic diagrams in my previous roles.

• I understand the basic components of a hydraulic system and how they are represented in a diagram.

• I am able to troubleshoot issues with hydraulic systems using the information provided in a diagram.

• For example, in my previous job as a mechanical technician, I used hydraulic diagrams to diagnose and repair issues with a hydraulic press.

Check valves can be tested by applying pressure to the upstream side and checking for any leakage on the downstream side.

• Apply pressure to the upstream side of the check valve

• Check for any leakage on the downstream side

• Use a pressure gauge to monitor pressure levels

• Inspect the valve for any signs of damage or wear

• Perform regular maintenance to ensure proper functioning

There are several types of hazards in the industry, including physical, chemical, biological, ergonomic, and psychosocial hazards.

• Physical hazards - such as noise, vibration, radiation, and extreme temperatures

• Chemical hazards - exposure to harmful substances like gases, liquids, and dusts

• Biological hazards - exposure to bacteria, viruses, and other microorganisms

• Ergonomic hazards - related to improper workstation setup, repetitive tasks, and lifting heavy objects

• Psychosocial...read more

The KOMATSU PC 210-8M0 engine has approximately 158 hp.

• The KOMATSU PC 210-8M0 engine is rated at around 158 horsepower.

• The engine power output can vary slightly depending on specific model variations or modifications.

• HP stands for horsepower, which is a unit of measurement for power in engines.

Starting & presser pipe is a term used in mechanical engineering to refer to pipes used for starting and pressurizing systems.

• Starting pipe is used to supply initial fluid or gas to start a system

• Presser pipe is used to maintain pressure in a system

• Examples include starting and presser pipes in hydraulic systems or pneumatic systems

Backlash is the clearance or lost motion between mechanical components, typically in gears or threads.

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

• It can be found in gears, threads, or any other mechanical connection where there is a gap between mating parts.

• Backlash can affect the accuracy and precision of a mechanical system.

• It is important to minimize backlash in precision machinery to ensure proper functioning.

• Backlash can be a...read more

The hydraulic system is a technology that uses liquid to transmit power.

• Uses incompressible fluid to generate force

• Consists of a pump, fluid reservoir, valves, cylinders, and motors

• Commonly used in heavy machinery like excavators and hydraulic presses

Why-why Analysis is a problem-solving technique that involves asking 'why' multiple times to get to the root cause of an issue.

• Involves asking 'why' repeatedly to uncover the underlying causes of a problem

• Helps in identifying the root cause of an issue rather than just addressing symptoms

• Commonly used in quality management and process improvement

• Example: If a machine breaks down - Why? Because a part failed - Why? Because it was not maintained properly - Why? Because maintena...read more

1 inch is equal to 25.4 mm.

• 1 inch = 25.4 mm

• This is a conversion question from inches to millimeters

• The conversion factor is constant and widely used in engineering and manufacturing

Four stroke cycle engine works by completing four distinct processes - intake, compression, power, and exhaust strokes.

• Intake stroke: Air-fuel mixture is drawn into the cylinder as the piston moves downward.

• Compression stroke: The intake valve closes and the piston compresses the mixture, preparing it for ignition.

• Power stroke: The spark plug ignites the compressed mixture, causing an explosion that drives the piston downward.

• Exhaust stroke: The exhaust valve opens and the pi...read more

Gear ratio is the ratio of the number of teeth on the driving gear to the number of teeth on the driven gear.

• Gear ratio determines the speed and torque of a system.

• In hydraulic systems, gear ratio affects the force and speed of fluid flow.

• In pneumatic systems, gear ratio affects the pressure and volume of air flow.

• For example, a gear ratio of 2:1 means that the driving gear has twice as many teeth as the driven gear.

• Gear ratio can be calculated by dividing the number of teeth...read more

Different types of parts of IC engine include cylinder block, piston, connecting rod, crankshaft, camshaft, valves, and spark plugs.

• Cylinder block houses the cylinders and other engine components

• Piston moves up and down inside the cylinder, compressing fuel and air mixture

• Connecting rod connects the piston to the crankshaft

• Crankshaft converts the up and down motion of the piston into rotational motion

• Camshaft controls the opening and closing of the valves

• Valves regulate the f...read more

Components refer to the individual parts or elements that make up a larger system or machine.

• Components can vary depending on the specific system or machine being discussed

• Examples of components in a car include the engine, transmission, brakes, and suspension

• In a computer, components include the motherboard, CPU, RAM, and hard drive

• Components can be mechanical, electrical, or electronic in nature

Types of pump casing include volute, diffuser, axial flow, and mixed flow.

• Volute casing: spiral-shaped casing that increases the velocity of the fluid

• Diffuser casing: converts kinetic energy into pressure energy

• Axial flow casing: directs the flow of fluid parallel to the axis of rotation

• Mixed flow casing: combines features of both radial and axial flow casings

ISRO does work in manufacturing, primarily focusing on the production of satellites, launch vehicles, and other space-related technologies.

• ISRO manufactures satellites for various purposes such as communication, remote sensing, and navigation.

• ISRO also manufactures launch vehicles like PSLV and GSLV for launching satellites into space.

• ISRO's manufacturing facilities are located in various centers across India, such as ISRO Satellite Centre (ISAC) in Bengaluru and Vikram Sarab...read more

Grinding row mill work process circuit maintenance working time

• The grinding row mill work process involves crushing and grinding materials to a fine powder

• The circuit maintenance involves checking and repairing any faults in the circuit

• Working time varies depending on the workload and maintenance needs

• Regular maintenance is crucial to ensure the mill operates efficiently and safely

Fire engines are used in various locations to respond to and extinguish fires.

• Fire engines are used in cities and towns to respond to structural fires in buildings.

• They are also used in rural areas to combat wildfires.

• Fire engines are deployed at airports to handle aircraft fires and emergencies.

• They are used in industrial areas to respond to fires in factories and warehouses.

• Fire engines are even used on ships and boats to fight fires at sea.

The jockey pump is typically located in the fire pump room or near the main fire pump.

• The jockey pump is a small pump used to maintain pressure in a fire protection system.

• It is usually installed in conjunction with the main fire pump.

• The jockey pump helps prevent the fire pump from starting and stopping frequently by maintaining a constant pressure in the system.

• It is commonly found in the fire pump room or in close proximity to the main fire pump.

• In some cases, it may be lo...read more

The hydraulic oil used for KOMATSU PC 130 & 210 is ISO VG 46 grade hydraulic oil.

• ISO VG 46 grade hydraulic oil is recommended for KOMATSU PC 130 & 210.

• It is important to use the correct grade of hydraulic oil to ensure optimal performance and longevity of the equipment.

HEMM stands for Heavy Earth Moving Machinery. It includes equipment like bulldozers, excavators, dump trucks, etc.

• HEMM is used in construction, mining, and other heavy industries.

• These machines are designed to move large quantities of earth, rocks, and other materials.

• Examples of HEMM include bulldozers, excavators, dump trucks, and cranes.

• Regular maintenance and proper operation are essential for the safe and efficient use of HEMM.

Belt drive is a mechanism that uses a belt to transmit power between two rotating shafts.

• Belt drive is a type of power transmission system commonly used in machinery and vehicles.

• It consists of a belt made of flexible material, such as rubber or synthetic fibers.

• The belt is looped around two pulleys, with one pulley connected to the power source and the other to the driven component.

• As the power source rotates, it causes the belt to move, transferring rotational motion and po...read more

I have experience working with various types of boilers including fire-tube, water-tube, and electric boilers.

• Fire-tube boilers: These boilers have hot gases flowing through tubes that are surrounded by water. Examples include Scotch marine boilers.

• Water-tube boilers: These boilers have water flowing through tubes that are heated externally by hot gases. Examples include Babcock and Wilcox boilers.

• Electric boilers: These boilers use electricity to generate heat and produce st...read more

Working mechanical maintenance involves repairing and maintaining mechanical equipment to ensure proper functionality.

• Performing routine maintenance on machinery and equipment

• Troubleshooting mechanical issues and repairing them

• Inspecting and testing machinery to ensure proper operation

• Replacing worn or damaged parts to prevent breakdowns

• Following maintenance schedules to prevent costly repairs

• Utilizing tools such as wrenches, screwdrivers, and power tools

• Collaborating with ot...read more

There are several types of valves used in mechanical systems.

• Gate valve

• Ball valve

• Butterfly valve

• Globe valve

• Check valve

• Diaphragm valve

• Plug valve

• Needle valve

• Pressure relief valve

• Safety valve

Mean environment refers to the average conditions or surroundings in a particular area or setting.

• Mean environment can include factors such as temperature, humidity, air quality, and noise levels.

• For example, a mean environment in a manufacturing plant may involve high temperatures, loud noises, and exposure to chemicals.

• Understanding the mean environment is important for ensuring the safety and efficiency of equipment and personnel.

• Monitoring and controlling the mean environ...read more

There are two main types of pumps: centrifugal pumps and positive displacement pumps.

• Centrifugal pumps work by converting rotational kinetic energy into hydrodynamic energy to move fluid.

• Positive displacement pumps use a mechanism to repeatedly expand and contract a cavity to move fluid.

• Examples of centrifugal pumps include water pumps in cars, while examples of positive displacement pumps include piston pumps in hydraulic systems.

The procedure involves closing the second valve and then opening it again.

• Isolate the second valve by closing it completely

• Wait for a few seconds to ensure the valve is fully closed

• Open the valve slowly to prevent damage to the valve or system

• Check for any leaks or abnormalities in the system

• Repeat the procedure if necessary

Refrigeration cycle is a process in which a refrigerant absorbs heat from a low-temperature space and rejects it in a high-temperature space.

• The refrigeration cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The refrigerant starts as a low-pressure gas in the evaporator where it absorbs heat from the space being cooled.

• The compressor then compresses the refrigerant into a high-pressure gas, increasing its temperature.

• The hot, high...read more

2 stroke engines have power strokes every revolution, while 4 stroke engines have power strokes every other revolution.

• 2 stroke engines have a simpler design with fewer moving parts.

• 2 stroke engines require a mixture of oil and fuel for lubrication.

• 4 stroke engines have separate intake, compression, power, and exhaust strokes.

• 4 stroke engines are more fuel efficient and produce less pollution.

• Examples: 2 stroke engines are commonly used in chainsaws and dirt bikes, while 4 st...read more

To use a fire extinguisher, remember the acronym PASS: Pull, Aim, Squeeze, Sweep.

• Pull the pin to break the seal

• Aim the nozzle at the base of the fire

• Squeeze the handle to release the extinguishing agent

• Sweep the nozzle from side to side until the fire is out

Theory of Motor vehicle involves understanding the principles and components of vehicles.

• Understanding the basic principles of internal combustion engines

• Knowledge of vehicle systems such as suspension, steering, and braking

• Familiarity with electrical systems in vehicles

• Ability to diagnose and repair mechanical issues in vehicles

• Knowledge of safety regulations and procedures in automotive maintenance

Diesel engines are internal combustion engines that use compression ignition to ignite the fuel mixture.

• Diesel engines are more fuel efficient than gasoline engines.

• They are commonly used in heavy-duty vehicles like trucks, buses, and construction equipment.

• Diesel engines produce more torque at lower RPMs compared to gasoline engines.

• They require less maintenance due to their simpler design and lack of spark plugs.

• Diesel engines emit more pollutants like nitrogen oxides and p...read more