30+ Service Technician Interview Questions and Answers

Three-phase supply consists of three alternating currents, while single-phase supply has only one alternating current.

• Three-phase supply is commonly used in industrial and commercial settings.

• Single-phase supply is typically used in residential applications.

• Three-phase supply provides more power and is more efficient than single-phase supply.

• Three-phase supply requires three conductors, while single-phase supply requires only two.

• Examples of three-phase devices include motors...read more

MCBs are more reliable and safer than fuses.

• MCBs can be reset and reused, while fuses need to be replaced after every trip

• MCBs have a faster response time than fuses, which can prevent damage to equipment

• MCBs have better overload protection than fuses

• MCBs are more convenient to use as they do not require replacement every time they trip

• MCBs are safer as they do not release harmful gases or debris when they trip

The first thing to check when a bike has starting trouble is the battery.

• Check the battery voltage and connections.

• Ensure the battery is fully charged.

• Inspect the battery terminals for corrosion or damage.

• Test the battery with a multimeter to determine its health.

• If necessary, replace the battery.

Difference between hardware and software, testing hardware components, troubleshooting process, and common computer components.

• Hardware refers to physical components of a computer while software refers to programs and applications.

• Drivers are software programs that allow hardware to communicate with the operating system.

• Hardware components can be tested using diagnostic tools or by physically inspecting them.

• The first step of the troubleshooting process is to identify the pro...read more

New fan regulators are more energy-efficient and have additional features compared to old ones.

• Old fan regulators use resistors to control the speed of the fan, while new ones use electronic circuits.

• New fan regulators have additional features such as remote control, timer, and speed settings.

• Old fan regulators are less energy-efficient and can cause the fan to make noise or vibrate.

• New fan regulators are more reliable and have a longer lifespan compared to old ones.

Yes, I am confident in working with axel swing arm on road side.

• I have experience working with axel swing arms in previous roles

• I am familiar with the necessary tools and techniques for handling axel swing arms

• I am comfortable working on road side and can adapt to different environments

• I prioritize safety protocols when working with heavy machinery

I would diagnose the issue, check for any faulty parts, and repair or replace them as necessary.

• Diagnose the issue by checking the thermostat, air filter, and electrical connections.

• Check for any faulty parts such as the compressor, fan motor, or refrigerant leaks.

• Repair or replace the faulty parts as necessary.

• Test the air conditioner to ensure it is functioning properly.

• Provide recommendations to the customer on how to prevent future issues.

As a service technician, I have to work on various types of chillers such as air-cooled, water-cooled, centrifugal, screw, and absorption chillers.

• Performing routine maintenance and repairs on chillers

• Diagnosing and troubleshooting issues with chillers

• Replacing faulty parts and components

• Performing leak detection and repair

• Conducting performance tests and adjusting settings

• Working with different types of refrigerants

• Ensuring compliance with safety regulations and standards

• Pro...read more

I have 5 years of experience as a Service Technician with a repair level of advanced proficiency.

• 5 years of experience in servicing various equipment and machinery

• Advanced proficiency in diagnosing and repairing mechanical and electrical issues

• Certified in handling specialized tools and equipment

• Familiar with troubleshooting software and hardware problems

• Experience in conducting preventive maintenance to prevent future breakdowns

There are several types of refrigeration gases, including R-22, R-134a, R-404A, and R-410A.

• Refrigeration gases are used in air conditioning and refrigeration systems to transfer heat.

• Different types of refrigeration gases have different properties and are used for different applications.

• Some common types of refrigeration gases include R-22, R-134a, R-404A, and R-410A.

• R-22 is a hydrochlorofluorocarbon (HCFC) that is being phased out due to its impact on the ozone layer.

• R-134a ...read more

A fitter is a skilled worker who assembles, installs, and repairs machinery and equipment.

• A fitter is responsible for assembling and installing machinery and equipment according to specifications.

• They may also be involved in repairing and maintaining machinery.

• Fitters use various tools and techniques to ensure proper fit and functionality.

• Examples of fitters include HVAC technicians, automotive mechanics, and industrial machinery installers.

I work on various types of air conditioners including split, window, central, and portable units.

• I have experience working on split air conditioners that have an indoor and outdoor unit connected by pipes.

• I also work on window air conditioners that are installed in a window frame.

• Central air conditioners are another type I work on that cool an entire building through a duct system.

• Portable air conditioners are also in my expertise, which can be moved from room to room.

No, UPS and inverter are not interchangeable.

• UPS is designed to provide backup power for a short duration, while an inverter is designed to provide continuous power.

• UPS typically has a built-in battery, while an inverter requires an external battery.

• UPS is commonly used for computers and other electronic devices, while inverters are used for larger appliances like refrigerators and air conditioners.

Yes, I have experience and knowledge in repairing machines.

• I have a strong understanding of machine components and their functions.

• I am skilled in diagnosing and troubleshooting machine issues.

• I have experience in repairing various types of machines, such as HVAC systems, printers, or industrial equipment.

• I am familiar with using tools and equipment required for machine repairs.

• I am knowledgeable in reading technical manuals and schematics to guide me in the repair process.

IC engine stands for Internal Combustion engine and EC engine stands for Electric Combustion engine.

• IC engine is a type of engine that uses fuel combustion to generate power.

• EC engine is a type of engine that uses electricity to generate power.

• IC engines are commonly used in automobiles, motorcycles, and small aircraft.

• EC engines are commonly used in electric vehicles and hybrid vehicles.

• IC engines require fuel to operate, while EC engines require a source of electricity.

• IC e...read more

I would start by checking the air filter, fuel filter, and spark plugs. Then move on to checking the fuel pressure and compression.

• Check air filter

• Check fuel filter

• Check spark plugs

• Check fuel pressure

• Check compression

A pressure compensator valve is a type of valve that maintains a constant pressure in a hydraulic system.

• It is used in hydraulic systems to maintain a constant pressure despite changes in flow rate or load.

• It works by adjusting the flow of fluid through the valve to maintain a set pressure.

• Examples include relief valves, flow control valves, and pressure reducing valves.

• It is important for ensuring the proper functioning and safety of hydraulic systems.

A capacitor stores electrical energy and releases it when needed.

• Capacitors are used in electronic circuits to filter out noise and stabilize voltage.

• They can also be used to store energy in flash cameras and defibrillators.

• Capacitors come in different types and sizes, with varying capacitance and voltage ratings.

• They are made of two conductive plates separated by a dielectric material.

• The capacitance of a capacitor depends on the surface area of the plates and the distance b...read more

BGA stands for Ball Grid Array, a type of surface-mount packaging used for integrated circuits.

• BGA stands for Ball Grid Array

• It is a type of surface-mount packaging used for integrated circuits

• BGA packages have solder balls arranged in a grid pattern on the underside of the package

Excavator boom cylinder drift can be caused by various factors.

• Leaking seals in the cylinder

• Contaminated hydraulic fluid

• Worn piston or rod

• Loose or damaged hydraulic lines

• Faulty control valve

• Improperly adjusted relief valve

• Air in the hydraulic system

• Incorrect installation or assembly

• Excessive load on the cylinder

• Lack of maintenance

• Environmental factors such as temperature changes

Relay and contactor are electrical switches that control the flow of electricity in a circuit.

• Relays are used to switch smaller currents in a circuit, while contactors are used to switch larger currents.

• Relays are often used in control circuits to turn on or off devices, while contactors are used in power circuits to control motors and other high-power loads.

• Both relay and contactor have an electromagnetic coil that, when energized, pulls in a set of contacts to make or break...read more

Flywheel cheek is a process used in service technician work.

• Flywheel cheek is a procedure to inspect and evaluate the condition of the flywheel cheek surface.

• It involves checking for any signs of wear, damage, or unevenness on the flywheel cheek.

• The process may include cleaning the flywheel cheek, measuring its thickness, and determining if it needs resurfacing or replacement.

• Service technicians use specialized tools and equipment such as dial indicators and micrometers to pe...read more

The firing order of a diesel engine refers to the sequence in which the cylinders ignite fuel and air mixture.

• The firing order is determined by the engine design and is usually specified in the engine manual.

• It is important to follow the correct firing order to ensure proper engine performance and minimize vibrations.

• The firing order is typically represented as a numerical sequence, such as 1-3-4-2 for a four-cylinder engine.

• The order of ignition is crucial for maintaining en...read more

Electric and technical work component in cars is crucial for their proper functioning.

• Electric and technical components include the battery, alternator, starter motor, and wiring.

• These components work together to power the car and control various functions such as lights, air conditioning, and the radio.

• Service technicians must have knowledge of these components and be able to diagnose and repair any issues that arise.

• Regular maintenance of these components is important to en...read more

I have 5 years of experience as a service technician.

• I have worked with various types of equipment and machinery.

• I have experience in troubleshooting and repairing mechanical and electrical issues.

• I have also provided customer service and support.

• I am familiar with safety protocols and regulations.

• I have completed training and certifications in relevant areas.

• For example, I have experience working with HVAC systems, generators, and industrial machinery.

The engine main parts include the cylinder block, pistons, crankshaft, camshaft, valves, and connecting rods.

• Cylinder block: houses the cylinders and other engine components

• Pistons: move up and down inside the cylinders, converting fuel into motion

• Crankshaft: converts the up-and-down motion of the pistons into rotational motion

• Camshaft: controls the opening and closing of the engine's valves

• Valves: regulate the flow of air and fuel into the cylinders and the exhaust gases out...read more

A four-stroke engine is an internal combustion engine that completes four separate strokes in one cycle.

• Intake stroke: Fuel and air are drawn into the cylinder.

• Compression stroke: The fuel-air mixture is compressed.

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

• Exhaust stroke: The piston pushes the exhaust gases out of the cylinder.

• Examples: Cars, motorcycles, lawn mowers, and generators use four-stroke engines.

MCB stands for Miniature Circuit Breaker, a device used to protect electrical circuits from overloads and short circuits.

• MCB is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions.

• It is commonly used in residential and commercial buildings to protect electrical appliances and wiring.

• MCBs are available in different current ratings and trip characteristics to suit different applications.

• They are more compact and efficient tha...read more

A two-stroke engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston.

• It has a simpler design than a four-stroke engine

• It produces more power per cycle

• It requires a mixture of oil and fuel to lubricate the engine

• Examples include chainsaws, dirt bikes, and some boats

• It is less fuel-efficient and produces more emissions than a four-stroke engine

Products are checked by following a systematic process to ensure quality and functionality.

• Inspect the physical condition of the product for any damages or defects

• Test the product's functionality to ensure it is working properly

• Verify that all components and accessories are included as per the specifications

• Check for any software updates or installations needed

• Document any findings or issues for further review

Yes, I am willing to take a drug test as part of the hiring process.

• I am willing to comply with any pre-employment drug testing requirements.

• I understand the importance of maintaining a drug-free workplace.

• I have no issues with taking a drug test to prove my commitment to the job.

The engine is the part of a machine that converts fuel into mechanical energy to power the machine.

• The engine is responsible for powering the machine it is a part of.

• It converts fuel into mechanical energy.

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

• Examples of machines with engines include cars, trucks, boats, and generators.

Left previous company due to relocation for family reasons

• Relocated to a different city to be closer to family

• Needed to prioritize family commitments over job location

• Wanted to create a better work-life balance by moving closer to family

Motor testing in multi meter involves checking various electrical parameters to ensure proper functioning.

• Use a multi meter to measure voltage, current, resistance, and continuity in the motor.

• Check for any abnormal readings or fluctuations in the measurements.

• Compare the readings with the motor's specifications to determine if it is operating within normal parameters.

• Perform insulation resistance testing to check for any faults or breakdowns in the motor's insulation.

• Ensure ...read more

Boom operations may be slow due to various reasons such as mechanical issues, operator error, or lack of maintenance.

• Check for any mechanical issues with the boom equipment

• Ensure the operator is properly trained and following correct procedures

• Regularly maintain and service the boom equipment to prevent slowdowns