400+ Technician Interview Questions and Answers

Different types of pipes are used for hot and cold water supply.

• Copper pipes are commonly used for both hot and cold water supply.

• PEX (cross-linked polyethylene) pipes are also used for hot and cold water supply.

• CPVC (chlorinated polyvinyl chloride) pipes are suitable for hot and cold water supply.

• Galvanized steel pipes were used in the past but are less common now due to corrosion issues.

• PVC (polyvinyl chloride) pipes are used for cold water supply only.

Reduce risk of global warming from R12 in air-conditioners

• Use alternative refrigerants like R134a or R290

• Ensure proper disposal of old refrigerants

• Regular maintenance and leak detection to prevent emissions

• Encourage energy-efficient ACs to reduce overall emissions

• Promote use of natural refrigerants like CO2 or ammonia

• Implement regulations and policies to phase out harmful refrigerants

• Invest in research and development of new, sustainable refrigerants

To find a fault in an AC, you can follow these steps:

• Check if the AC is receiving power and if the circuit breaker is tripped

• Inspect the thermostat settings and ensure they are properly set

• Examine the air filter and clean or replace it if necessary

• Inspect the condenser unit for any visible damage or debris

• Check the refrigerant levels and ensure they are within the recommended range

• Inspect the electrical connections and wiring for any loose or damaged components

• Test the capaci...read more

If a fault comes in a fixed pipe in the wall, I would follow a systematic approach to address the issue.

• Assess the extent of the fault and identify the cause

• Turn off the water supply to prevent further damage

• Determine if the fault can be repaired or if the pipe needs to be replaced

• If repairable, use appropriate tools and materials to fix the fault

• Test the repaired pipe for leaks and ensure proper functionality

• If replacement is necessary, carefully remove the damaged pipe and ...read more

Wall putty is a white cement-based powder used for smoothening and leveling the surface of walls before painting.

• Wall putty is a type of filler material used to fill cracks, holes, and imperfections on walls.

• It is applied on the surface of walls to create a smooth and even base for painting.

• Wall putty helps in improving the durability and finish of paint.

• It is commonly used in both interior and exterior walls of buildings.

• Wall putty can be used on various surfaces such as con...read more

To manage scrap reduction while achieving production targets, it is important to implement efficient quality control measures and continuous improvement strategies.

• Implementing strict quality control measures to identify and address root causes of scrap

• Regularly analyzing production processes to identify areas for improvement

• Training employees on proper production techniques and waste reduction strategies

• Utilizing lean manufacturing principles to streamline processes and redu...read more

CSR stands for Customer Service Representative. AC refers to Air Conditioning.

• CSR is a role in customer service where representatives assist customers with their inquiries, complaints, and requests.

• AC refers to the system that provides cooling and ventilation in buildings or vehicles.

• To find out about AC, one can refer to the user manual, consult an expert technician, or search online for troubleshooting guides.

• CSR and AC are unrelated terms, but both are commonly used in dif...read more

The duration of vacuum pressure in an AC system varies depending on the specific circumstances.

• The duration of vacuum pressure in an AC system is typically determined by the evacuation process.

• During installation or repair, the vacuum pump is used to remove air and moisture from the system.

• The duration can range from a few minutes to several hours, depending on the size and complexity of the AC system.

• Once the desired vacuum level is achieved, the vacuum pressure is maintaine...read more

Air-conditioning parts of a car and their working condition.

• The compressor compresses the refrigerant gas.

• The condenser cools the refrigerant gas into a liquid.

• The evaporator absorbs heat from the car's interior.

• The expansion valve regulates the flow of refrigerant.

• The receiver-drier removes moisture from the refrigerant.

• All parts must be in good working condition for optimal cooling.

• Leaks in the system can cause poor performance or failure.

The commonly used elbow for draining water is the P-trap elbow.

• The P-trap elbow is commonly used for draining water in plumbing systems.

• It is named after its shape, which resembles the letter 'P'.

• The P-trap elbow is designed to prevent sewer gases from entering the building.

• It is typically used in sinks, showers, and other plumbing fixtures.

• Other types of elbows, such as 90-degree elbows, may also be used depending on the specific plumbing configuration.

The Simplex method is used to solve linear programming problems with multiple variables and constraints.

• Used in optimization problems

• Used to find the optimal solution

• Used when there are multiple variables and constraints

• Examples include production planning and resource allocation

The 'Y' shape plumbing fixture is used to connect three pipes together at a 45-degree angle.

• It is commonly used in plumbing systems to divert or combine the flow of water or other fluids.

• The 'Y' shape allows for smooth flow and minimal pressure drop.

• Examples include connecting a sink drain pipe to a main sewer line or connecting multiple pipes in a drainage system.

To achieve production target within time and quality, proper planning, efficient resource allocation, continuous monitoring, and timely adjustments are essential.

• Develop a detailed production plan outlining tasks, timelines, and resource requirements

• Allocate resources effectively to ensure smooth workflow and minimize bottlenecks

• Implement quality control measures at each stage of production to maintain high standards

• Monitor progress regularly and make adjustments as needed to...read more

To calibrate pressure gauges, vacuum gauges, and compound gauges, follow these steps:

• Use a known reference pressure source to compare the readings of the gauges.

• Adjust the gauges if there is any deviation from the reference pressure.

• Repeat the process multiple times to ensure accuracy.

• Document the calibration process and results for future reference.

• Perform regular calibrations to maintain accuracy.

• Example: For pressure gauges, connect them to a pressure calibrator and adjust...read more

Check the power source and connections.

• Check if the TV is properly plugged into a power outlet.

• Ensure that the power cable is not damaged.

• Verify if there is power supply to the outlet.

• Check if the power switch on the TV is turned on.

• Inspect the connections between the TV and any external devices.

Precision air conditioning units are commonly used in server rooms.

• Precision air conditioning units are designed to provide precise temperature and humidity control.

• These units are capable of maintaining stable and optimal conditions for sensitive equipment like servers.

• They often feature redundant systems for reliability and may include features like hot aisle/cold aisle containment.

• Examples of precision air conditioning units include brands like Liebert, APC, and Mitsubishi...read more

Calibrating temperature indicators involves adjusting them to ensure accurate readings.

• Calibration of temperature indicators involves comparing their readings to a known standard.

• Adjustments are made to the indicators to align their readings with the standard.

• Calibration may involve adjusting the zero point and span of the indicators.

• Examples of temperature indicators include thermometers, temperature sensors, and temperature gauges.

Some common equipment used in painting work include paintbrushes, rollers, sprayers, drop cloths, and paint trays.

• Paintbrushes are used to apply paint to surfaces.

• Rollers are used to quickly cover large areas with paint.

• Sprayers are used for applying paint evenly and smoothly.

• Drop cloths are used to protect floors and furniture from paint splatters.

• Paint trays are used to hold and distribute paint during the painting process.

Calibration is the process of adjusting or verifying the accuracy of a measuring instrument or device.

• Calibration ensures that measurements taken by an instrument are accurate and reliable.

• It involves comparing the measurements of a device to a known standard.

• Calibration may involve adjusting the device to bring it in line with the standard.

• It is important in various fields like engineering, manufacturing, and scientific research.

• For example, a thermometer may be calibrated b...read more

MCV is a measure of the average size of red blood cells. To test a short in a wire, use a multimeter. Phase and neutral are different types of electrical connections.

• MCV stands for Mean Corpuscular Volume and is a measure of the average size of red blood cells.

• To test a short in a wire, use a multimeter to check for continuity or resistance.

• Phase refers to the live wire that carries the electrical current, while neutral refers to the wire that completes the circuit and carrie...read more

The ratio of petrol refers to the proportion of petrol in a mixture or fuel.

• The ratio of petrol is typically expressed as a fraction or percentage.

• For example, a fuel mixture with a petrol ratio of 1:4 means that for every 1 part of petrol, there are 4 parts of other components.

• The petrol ratio can vary depending on the specific fuel blend or application.

• It is important to maintain the correct petrol ratio for optimal performance and efficiency.

• The petrol ratio may also be in...read more

The list count of varniya caliper is typically 0, as varniya caliper is not a standard or commonly used tool in the field of measurement.

• Varniya caliper is not a standard tool in the field of measurement

• There is no specific list count for varniya caliper as it is not commonly used

• It is important to use standard calipers for accurate measurements

Learning from misprocess improves product quality.

• Misprocess helps identify flaws in the production process.

• Analyzing misprocess helps in finding solutions to improve product quality.

• Learning from misprocess helps in preventing future errors and improving efficiency.

• For example, if a batch of products is found to be defective, analyzing the misprocess can help identify the root cause and prevent it from happening again.

I have studied various electronics subjects in the last 3 years.

• Analog Electronics

• Digital Electronics

• Microcontrollers

• Signal Processing

• Electromagnetics

Compile time errors occur during the compilation of the code, while runtime errors occur during the execution of the program.

• Compile time errors are detected by the compiler and prevent the program from being successfully compiled.

• Runtime errors occur when the program is running and can cause the program to terminate abruptly or produce unexpected results.

• Compile time errors are usually syntax or type-related errors, such as missing semicolons or undefined variables.

• Runtime e...read more

Flow trips are used in building to control the flow of fluids or gases.

• Flow trips are commonly used in plumbing systems to prevent backflow of water.

• They are also used in HVAC systems to regulate the flow of air.

• Flow trips can be found in industrial processes to control the movement of liquids or gases.

• In fire protection systems, flow trips are used to detect the presence of water and activate alarms or sprinklers.

• Flow trips are essential in water treatment plants to ensure p...read more

Yes, I am familiar with parallel and series circuits.

• Parallel circuits have multiple paths for current flow.

• In a parallel circuit, the voltage across each branch is the same.

• Series circuits have a single path for current flow.

• In a series circuit, the total resistance is the sum of individual resistances.

• Parallel circuits are commonly used in household wiring, while series circuits are used in Christmas lights.

Yes, I have knowledge about electric work.

• I have completed a course in electrical wiring and installation.

• I have experience in troubleshooting electrical issues.

• I am familiar with electrical codes and safety regulations.

• I have worked on various electrical projects, such as installing lighting fixtures and wiring outlets.

• I am comfortable using electrical tools and equipment.

Petrol engines use spark ignition while diesel engines use compression ignition.

• Petrol engines have a higher power output but lower fuel efficiency compared to diesel engines.

• Diesel engines have a longer lifespan and are more durable than petrol engines.

• Petrol engines are lighter and more compact than diesel engines.

• Examples of petrol engines include those found in cars and motorcycles while diesel engines are commonly used in trucks and buses.

EGR system reduces NOx emissions by recirculating a portion of exhaust gas back into the engine intake.

• EGR valve controls the flow of exhaust gas into the intake manifold

• Recirculated exhaust gas reduces combustion temperature and lowers NOx emissions

• EGR system can cause carbon buildup in the intake manifold and reduce engine performance

• EGR system is commonly used in diesel engines

• EGR system can be disabled or removed for performance gains, but it is illegal in some regions

Computer simulation can be conducted to study traffic flow on a busy road.

• Identify the key variables such as traffic volume, vehicle types, road conditions, and traffic control measures

• Develop a mathematical model to represent the flow of traffic

• Collect real-world data to calibrate and validate the model

• Use simulation software like VISSIM or SUMO to create a virtual environment

• Input the variables and parameters into the simulation software

• Run the simulation multiple times wit...read more

An engine is a machine that converts fuel into mechanical energy. There are two types of engines: petrol and diesel.

• An engine is a device that converts fuel into mechanical energy to power a vehicle or machine.

• Petrol engines use a spark plug to ignite the fuel-air mixture, while diesel engines use compression to ignite the fuel.

• Petrol engines are generally more powerful and responsive, while diesel engines are more fuel-efficient and have more torque.

• Other types of engines in...read more

SPS stands for Switched Power Supply. A rectifier is an electrical device that converts AC to DC.

• SPS is a type of power supply that uses switching regulators to convert electrical power efficiently.

• Rectifiers are used in power supplies to convert AC voltage to DC voltage.

• The work of a rectifier is to convert AC voltage to DC voltage by allowing current to flow in only one direction.

• Examples of rectifiers include diodes, bridge rectifiers, and voltage regulators.

To check door interlock systems, inspect the physical components, test the electrical connections, and verify proper functioning.

• Inspect the door hinges, latches, and locks for any damage or misalignment.

• Check the wiring connections and ensure they are secure and not damaged.

• Test the interlock switch by opening and closing the door to see if it activates properly.

• Verify that the interlock system prevents the door from being opened when the machine is in operation.

• Ensure that ...read more

The laws of thermodynamics describe the behavior of energy in a system. Entropy always increases in a closed system.

• The first law states that energy cannot be created or destroyed, only transferred or converted.

• The second law states that the total entropy of a closed system always increases over time.

• The third law states that as temperature approaches absolute zero, the entropy of a system approaches a minimum.

• Entropy is a measure of the disorder or randomness in a system.

• Exa...read more

Software is a collection of programs, data, and instructions that enable a computer to perform tasks.

• Software is the intangible part of a computer system.

• It includes operating systems, applications, and utilities.

• Examples of software include Microsoft Windows, Adobe Photoshop, and Google Chrome.

Data structure is a way of organizing and storing data in a computer so that it can be accessed and used efficiently.

• Data structure defines the way data is organized and stored in memory

• It helps in efficient retrieval and manipulation of data

• Examples include arrays, linked lists, stacks, queues, trees, and graphs

Types of operating systems include Windows, macOS, Linux, and mobile OS like Android and iOS.

• Windows: Developed by Microsoft, widely used in personal computers.

• macOS: Developed by Apple, used in Macintosh computers.

• Linux: Open-source OS, used in servers and embedded systems.

• Android: Mobile OS developed by Google, used in smartphones and tablets.

• iOS: Mobile OS developed by Apple, used in iPhones and iPads.

The inner diameter of ball bearing 1212 is 12 mm.

• The inner diameter of ball bearing 1212 is a measurement of the distance across the center of the bearing's inner ring.

• It is typically expressed in millimeters (mm).

• In the case of ball bearing 1212, the inner diameter is 12 mm.

Four wheel drive (4WD) uses all four wheels to power the vehicle, while two wheel drive (2WD) uses only two wheels.

• 4WD provides better traction and control in off-road and slippery conditions

• 2WD is more fuel efficient and less expensive

• Examples of 4WD vehicles include SUVs and trucks, while 2WD vehicles include sedans and coupes

Aircraft basic 6 instruments are essential flight instruments for pilots to maintain control and navigate safely.

• The six basic instruments include airspeed indicator, attitude indicator, altimeter, turn coordinator, heading indicator, and vertical speed indicator.

• Airspeed indicator shows the speed of the aircraft through the air.

• Attitude indicator displays the orientation of the aircraft in relation to the horizon.

• Altimeter provides the altitude above sea level.

• Turn coordinat...read more

Radio frequencies used in aircraft are used for communication, navigation, and surveillance purposes.

• Radio frequencies are used for communication between pilots and air traffic control towers.

• They are also used for navigation systems such as VOR (VHF Omnidirectional Range) and GPS (Global Positioning System).

• Radio frequencies are used for surveillance purposes, such as radar systems for air traffic control.

• Different frequencies are allocated for different purposes, such as VH...read more

Working system faults can be caused by various factors such as hardware failure, software bugs, power outages, and human error.

• Hardware failure: malfunctioning components, overheating, or physical damage

• Software bugs: coding errors, compatibility issues, or outdated software

• Power outages: sudden loss of power or voltage fluctuations

• Human error: incorrect configuration, mishandling of equipment, or lack of training

• Examples: hard drive failure, virus infection, corrupted files,...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• The ratio of a transformer is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.

• To check AC voltage, use a voltmeter set to AC voltage and connect the probes to the circuit. To check DC volta...read more

I have a good understanding of rolling in hot steel rolling mills.

• I am familiar with the process of hot steel rolling, which involves passing heated steel through a series of rollers to shape it.

• I have knowledge of the different types of rolling mills used in the industry, such as blooming mills, plate mills, and strip mills.

• I understand the importance of temperature control and lubrication in the rolling process to ensure the quality of the final product.

• I am aware of the sa...read more

My area of interest is electrical engineering and troubleshooting.

• Electrical engineering

• Troubleshooting

• Circuit design

• Equipment maintenance

• Power systems

New generation vehicles are mandatory due to environmental concerns, technological advancements, and changing consumer preferences.

• Environmental concerns: New generation vehicles are more fuel efficient and produce lower emissions, helping to reduce pollution and combat climate change.

• Technological advancements: New vehicles come equipped with advanced safety features, connectivity options, and autonomous driving capabilities.

• Changing consumer preferences: Consumers are incre...read more