100+ Service Engineer Interview Questions and Answers for Freshers

The purpose of work is to contribute to society, fulfill personal goals, and earn a living.

• To contribute to society by providing goods or services that meet the needs of others

• To fulfill personal goals and aspirations by using skills and talents

• To earn a living and support oneself and one's family financially

RFID (Radio Frequency Identification) equipment is used for tag detection.

• RFID equipment is commonly used for tag detection in various industries.

• Examples of RFID equipment include RFID readers, antennas, and tags.

• RFID technology uses radio waves to identify and track objects or people.

Specific gravity of a battery is a measure of its electrolyte's density compared to water.

• Specific gravity is typically measured using a hydrometer.

• It indicates the state of charge of a lead-acid battery.

• A fully charged lead-acid battery will have a specific gravity of around 1.265.

• A discharged battery will have a lower specific gravity, around 1.150.

Main power supply voltage range should typically fall within a specified range to ensure proper functioning of the equipment.

• Main power supply voltage range is usually specified by the manufacturer of the equipment.

• It is important to ensure that the voltage supplied falls within this specified range to prevent damage to the equipment.

• For example, a main power supply voltage range for a particular equipment may be 100V-240V.

There are two types of RAM: SRAM and DRAM.

• SRAM (Static Random Access Memory) is faster and more expensive than DRAM.

• DRAM (Dynamic Random Access Memory) is slower and less expensive than SRAM.

• SRAM is used in cache memory while DRAM is used in main memory.

• SRAM retains data without refreshing while DRAM requires constant refreshing.

• SRAM is used in high-performance computing while DRAM is used in personal computers and mobile devices.

The principle of motor is the conversion of electrical energy into mechanical energy.

• Motor operates based on the principle of electromagnetic induction.

• When an electric current flows through a coil in a magnetic field, it creates a force that rotates a shaft.

• The direction of rotation can be controlled by reversing the direction of the current.

• Motors are used in various applications such as electric vehicles, industrial machinery, and household appliances.

Ethernet cables use color coding to differentiate between different types of cables and their functions.

• Ethernet cables typically use four pairs of colors: orange, green, blue, and brown.

• Each pair consists of a solid color wire and a striped wire of the same color.

• The color coding helps in identifying the correct wiring sequence for connecting Ethernet cables.

• For example, in a standard Ethernet cable, the wiring sequence is white-orange, orange, white-green, blue, white-blue,...read more

The unit of electrical resistance is Ohm.

• The unit of electrical resistance is named after German physicist Georg Simon Ohm.

• The symbol for Ohm is the Greek letter omega (Ω).

• One Ohm is equal to one volt per ampere (V/A).

Heel and toe wear in a tyre can be identified by examining the tread pattern.

• Heel wear occurs on the outside edge of the tyre tread and is caused by excessive cornering.

• Toe wear occurs on the inside edge of the tyre tread and is caused by misalignment of the wheels.

• To check for heel and toe wear, examine the tread pattern and look for uneven wear on the edges of the tread.

• If heel and toe wear is identified, it is important to address the underlying cause to prevent further da...read more

Hydraulic systems use liquid to transmit power, while pneumatic systems use gas.

• Hydraulic systems use oil or water as the fluid medium, while pneumatic systems use air or other gases.

• Hydraulic systems are typically used in heavy-duty applications like construction equipment, while pneumatic systems are used in lighter applications like air brakes in vehicles.

• Hydraulic systems are generally more powerful and can handle higher loads than pneumatic systems.

• Hydraulic systems are ...read more

ACS & CCTV are used for security and access control purposes.

• ACS (Access Control System) is used to restrict access to authorized personnel only.

• CCTV (Closed Circuit Television) is used for surveillance and monitoring purposes.

• ACS helps in preventing unauthorized entry and ensures the safety of people and assets.

• CCTV provides visual evidence in case of any security incidents or breaches.

• ACS and CCTV together enhance overall security measures and help in maintaining a secure e...read more

Quality standards for weighbridges ensure accuracy, reliability, and safety in weighing operations.

• Weighbridges should comply with national and international standards such as OIML R76 and ASTM E-4.

• Regular calibration and maintenance are essential to ensure accuracy.

• Weighbridges should have a high load capacity and be able to withstand harsh environmental conditions.

• Safety features such as overload protection and anti-skid surfaces are important.

• Quality materials and construc...read more

BMS manages battery charging by monitoring voltage, current, and temperature.

• BMS ensures that the battery is charged within safe limits to prevent damage.

• It monitors the voltage, current, and temperature of the battery to determine the charging rate.

• BMS may also control the charging process by adjusting the charging rate based on the battery's state of charge.

• For example, if the battery is nearly full, the BMS may reduce the charging rate to prevent overcharging.

• BMS may also ...read more

Relays are electrically operated switches that control high power circuits with low power signals.

• Relays have an electromagnet that moves an armature to open or close the circuit

• They are used to control motors, lights, heaters, and other high power devices

• Relays can have different configurations such as SPST, SPDT, DPST, and DPDT

• Examples of relays include automotive relays, solid-state relays, and time delay relays

There are three types of wear: abrasive, adhesive, and surface fatigue.

• Abrasive wear occurs when hard particles or surfaces rub against a softer surface, causing material loss.

• Adhesive wear happens when two surfaces stick together and then separate, causing material to be pulled off.

• Surface fatigue wear occurs when repeated stresses cause cracks or other damage to the surface of a material.

• Examples of wear include erosion of a riverbed due to abrasive wear, scuffing of a shoe...read more

The process of installing Lixus involves several steps such as preparing the installation environment, configuring the database, and setting up the application.

• Prepare the installation environment by ensuring that the server meets the system requirements

• Configure the database by creating a new database and user, and granting necessary permissions

• Download and extract the Lixus installation package

• Run the installation script and follow the prompts to complete the installation

• Co...read more

It is possible to stop an electronic energy meter.

• Electronic energy meters can be stopped by cutting off the power supply.

• Tampering with the meter's internal components can also stop it from functioning.

• However, stopping an energy meter is illegal and can result in fines or legal action.

• It is important to report any suspected meter tampering to the appropriate authorities.

Compressor in diesel engine compresses air to increase its pressure and temperature.

• Compressor draws in air from the atmosphere and compresses it before sending it to the engine.

• The compressed air is mixed with fuel in the combustion chamber to create a high-pressure explosion that powers the engine.

• The compressor is driven by the engine's crankshaft through a belt or gear system.

• The compressor also helps to cool the engine by circulating air through the radiator.

• The compress...read more

Electric vehicles are vehicles that run on electric motors powered by rechargeable batteries instead of internal combustion engines.

• Electric vehicles are environmentally friendly as they emit no tailpipe pollutants

• They are more energy-efficient than traditional vehicles

• Examples of electric vehicles include Tesla Model S, Nissan Leaf, and Chevrolet Bolt

• Electric vehicles require charging stations for recharging their batteries

• The range of electric vehicles is improving with adv...read more

Electricity is generated through various methods including thermal, hydro, nuclear, and renewable sources.

• Thermal power plants burn fossil fuels like coal, oil, and gas to generate steam that drives turbines to produce electricity.

• Hydroelectric power plants use the force of falling water to turn turbines and generate electricity.

• Nuclear power plants use nuclear reactions to heat water and produce steam that drives turbines to generate electricity.

• Renewable sources like solar,...read more

A sensor is a device that detects and responds to a physical input or stimulus, converting it into an electrical signal.

• Sensors are used in various industries and applications, such as automotive, aerospace, healthcare, and environmental monitoring.

• There are different types of sensors, including temperature sensors, pressure sensors, proximity sensors, and motion sensors.

• Examples of sensors include thermocouples, accelerometers, photodiodes, and ultrasonic sensors.

Project management is the process of planning, organizing, and managing resources to achieve specific goals and objectives.

• It involves defining project goals and objectives

• Creating a detailed project plan

• Assigning tasks and responsibilities to team members

• Monitoring progress and making adjustments as needed

• Ensuring that the project is completed on time, within budget, and to the satisfaction of stakeholders

• Examples include construction projects, software development, and even...read more

Corona effect is the phenomenon of ionization of air surrounding a conductor carrying high voltage, leading to energy loss and potential hazards.

• Corona effect occurs when the electric field around a conductor is strong enough to ionize the air molecules, creating a visible glow or corona discharge.

• It can lead to energy loss, audible noise, radio interference, and even damage to the conductor.

• Corona effect is more likely to occur at high voltages and in high humidity environme...read more

A two-stroke engine completes a power cycle in two strokes of the piston, while a four-stroke engine completes it in four strokes.

• Two-stroke engines have a simpler design with fewer moving parts compared to four-stroke engines.

• Two-stroke engines typically produce more power for their size but are less fuel-efficient and emit more pollution.

• Four-stroke engines are more common in cars, motorcycles, and larger machinery due to their better fuel efficiency and lower emissions.

• Exa...read more

Yes, I can speak general English fluently.

• I have a strong command of the English language

• I can communicate effectively in English

• I am comfortable speaking English in various situations

Motors are devices that convert electrical energy into mechanical energy. There are various types of motors.

• DC motors convert electrical energy into mechanical energy using a magnetic field. They are commonly used in household appliances.

• AC motors are used in industrial applications and are more efficient than DC motors.

• Stepper motors are used in robotics and automation as they can move in precise steps.

• Servo motors are used in control systems to maintain a specific position ...read more

VFD stands for Variable Frequency Drive. It is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the motor.

• VFD controls the speed and torque of an AC motor by varying the frequency of the electrical input.

• It converts fixed frequency and voltage AC power to variable frequency and voltage output.

• VFDs are commonly used in HVAC systems, industrial pumps, and conveyor systems.

• They help in energy savings by matching the motor ...read more

Percentage reactance is a measure of the opposition to the flow of alternating current in a circuit due to inductance or capacitance.

• Percentage reactance is calculated as the reactance value divided by the total impedance of the circuit, multiplied by 100.

• It is expressed as a percentage to indicate the proportion of the total impedance that is due to reactance.

• In an AC circuit, reactance can be either capacitive or inductive, depending on the components present.

• For example, i...read more

A hydraulic pump is a mechanical device that converts mechanical power into hydraulic energy by generating flow within a hydraulic system.

• Hydraulic pumps are used to generate flow to move fluids within a hydraulic system.

• They are commonly used in applications such as construction equipment, automotive systems, and industrial machinery.

• There are different types of hydraulic pumps, including gear pumps, vane pumps, and piston pumps.

• Hydraulic pumps are typically powered by elect...read more

The program of the unit refers to the software that controls its functions and operations.

• The program may include various modules for different functions such as diagnostics, maintenance, and control.

• Examples of programs for service engineers include MATLAB, LabVIEW, and Python.

• The program may also include firmware updates and patches to improve performance and fix bugs.

• Service engineers may need to troubleshoot and debug the program to identify and resolve issues.

• Regular upd...read more

The cable used for CCTV camera installation is called coaxial cable.

• Coaxial cable is used for transmitting video signals from the camera to the recording device.

• It is a type of shielded cable that has a central conductor surrounded by insulation and a braided shield.

• RG59 and RG6 are common types of coaxial cable used for CCTV installations.

A relay is an electrically operated switch that uses an electromagnet to mechanically control the switching action.

• Relays are used to control high power or high voltage circuits with a low power signal.

• They can be classified into different types based on their construction and operation, such as electromagnetic relays, solid-state relays, thermal relays, etc.

• Electromagnetic relays use an electromagnet to control the switching action, while solid-state relays use semiconductor...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding receives electrical energy from the input circuit and produces a magnetic field.

• This magnetic...read more

The colour code of twisted pair cables is used to identify the different pairs of wires within the cable.

• The most common colour code for twisted pair cables is the TIA/EIA 568 standard, which uses the following colours: white/blue, blue, white/orange, orange, white/green, green, white/brown, brown.

• The colour code helps technicians easily identify and match the correct pairs of wires when terminating the cable.

• Using the correct colour code is essential for ensuring proper conn...read more

Realy is a type of relay used in electrical systems to control high power devices with low power signals.

• Relays are switches that open and close circuits electromechanically

• Realy is a type of relay specifically designed for high power applications

• Working principle involves an electromagnet that moves an armature to open or close the circuit

• Commonly used in industrial automation, automotive, and HVAC systems

PCD and CCD are important parameters for star delta and R-Dol starters.

• PCD stands for Phase Changeover Delay, which is the time delay between switching from star to delta connection in a motor starter.

• CCD stands for Current Changeover Delay, which is the time delay between switching from star to delta connection in a motor starter.

• In star delta starters, PCD and CCD are crucial for ensuring smooth transition and preventing damage to the motor.

• For example, in a star delta star...read more

A load cell is a transducer that converts force or weight into an electrical signal.

• Load cells are used in various industries to measure force or weight, such as in weighing scales, industrial automation, and material testing.

• They work on the principle of strain gauges, which change their resistance when subjected to force.

• Load cells can be classified into different types based on their shape, size, and application, such as compression, tension, shear, and bending.

• They are ca...read more

Resistance is the opposition to the flow of electric current in a circuit.

• Resistance is measured in ohms (Ω).

• It is caused by factors such as the material of the conductor, its length, and its cross-sectional area.

• Resistance can be calculated using Ohm's Law: R = V/I, where R is resistance, V is voltage, and I is current.

• Higher resistance leads to lower current flow.

• Examples of resistors include light bulbs, heating elements, and electrical wires.

Current and voltage vary at different circuits depending on the load and resistance.

• Current and voltage are directly proportional to each other according to Ohm's Law.

• The current and voltage can be measured using a multimeter.

• The current and voltage can be affected by the type of circuit, load, and resistance.

• In AC circuits, the current and voltage can be out of phase with each other.

• In DC circuits, the current and voltage are always in phase with each other.

VGA cable is used to connect a computer or laptop to a monitor or projector.

• VGA stands for Video Graphics Array.

• It has 15 pins and is usually blue in color.

• One end of the cable is plugged into the computer's VGA port and the other end is plugged into the monitor's VGA port.

• Make sure both ends are securely connected.

• VGA cables can transmit video signals up to a resolution of 1920x1200.

• VGA cables are being replaced by newer technologies like HDMI and DisplayPort.

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

• 2 stroke engines have a simpler design and are lighter than 4 stroke engines

• 2 stroke engines have a higher power-to-weight ratio than 4 stroke engines

• 4 stroke engines are more fuel efficient and have a longer lifespan than 2 stroke engines

• 4 stroke engines have a separate lubrication system, while 2 stroke engines use oil mixed with fuel for lubricatio...read more

A capacitor is an electronic component that stores and releases electrical energy.

• A capacitor consists of two conductive plates separated by an insulating material called a dielectric.

• When a voltage is applied across the plates, one plate accumulates positive charge while the other accumulates negative charge.

• Capacitors are commonly used in electronic circuits for various purposes such as energy storage, filtering, and coupling.

• They can store electrical energy and release it ...read more

CMOS stands for Complementary Metal-Oxide-Semiconductor. It is a type of technology used in electronic devices.

• CMOS is a type of semiconductor technology used in microprocessors, memory chips, and other electronic devices.

• It uses both p-type and n-type metal-oxide-semiconductor field-effect transistors (MOSFETs) to create a low-power, high-speed circuit.

• CMOS is commonly used in digital cameras, smartphones, and computers.

• It is known for its low power consumption and high nois...read more

Yes, I have experience in machine work.

• I have worked with various machines such as lathes, milling machines, and CNC machines.

• I am skilled in reading technical drawings and blueprints to set up and operate machines.

• I have experience in troubleshooting and repairing machines to ensure smooth operation.

• I have knowledge of different machining techniques and tools, such as cutting, drilling, and grinding.

• I have successfully completed projects that involved precision machining and...read more

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers consist of two coils of wire, known as the primary and secondary windings.

• When an alternating current flows through the primary winding, it creates a changing magnetic field which induces a voltage in the secondary winding.

• Transformers are used to step up or step down voltage levels in electrical systems, depending on the application.

• Examples ...read more

A PA system, or public address system, is a system of electronic devices used to amplify and distribute sound to a large audience.

• Consists of microphones, amplifiers, loudspeakers, and other audio equipment

• Used in public spaces, schools, stadiums, and other venues to make announcements or play music

• Can be wired or wireless, with various configurations for different needs

Electric vehicles run on electricity stored in batteries that power an electric motor.

• Electricity is stored in batteries

• Electric motor converts electrical energy into mechanical energy

• No need for gasoline or diesel fuel

• Regenerative braking system helps recharge the battery while driving

• Range varies depending on battery capacity and driving conditions