100+ Senior Technician Interview Questions and Answers

To troubleshoot a computer that doesn't turn on, check power connections, test the power supply, and diagnose hardware issues.

• Check power connections to ensure the computer is properly plugged in and the power switch is turned on.

• Test the power supply using a multimeter or by swapping it with a known working one.

• Diagnose hardware issues by disconnecting all peripherals, removing and reseating RAM and other components, and checking for any visible damage or loose connections.

• I...read more

Electrical faults in motors can include short circuits, open circuits, insulation breakdown, and overloading.

• Short circuits occur when there is a direct connection between the motor windings, causing excessive current flow.

• Open circuits happen when there is a break in the electrical path, preventing current from flowing.

• Insulation breakdown occurs when the insulation material surrounding the motor windings deteriorates, leading to electrical leakage or shorting.

• Overloading ha...read more

Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction. Power factor is a measure of how effectively electrical power is being used in a circuit.

• Transformers work on the principle of electromagnetic induction, where a changing magnetic field induces a voltage in a nearby coil of wire.

• They are used to step up or step down voltage levels in electrical power transmission and distribution systems.

• Power factor is the...read more

The bore refers to the diameter of the cylinders in an engine. The transmission is the component that transfers power from the engine to the wheels. High efficiency accessories can include items like turbochargers or lightweight components.

• Bore is the diameter of the cylinders in an engine

• Transmission transfers power from engine to wheels

• High efficiency accessories can include turbochargers or lightweight components

Motor overcurrent faults can be caused by various factors.

• Overloading

• Short circuits

• Ground faults

• Mechanical binding

• Voltage imbalance

• Inadequate cooling

• Excessive starting

• Inadequate wire size

• Inadequate protection

• Motor design flaws

Both copper and aluminium condensers have their advantages and disadvantages.

• Copper condensers have better heat transfer properties and are more durable.

• Aluminium condensers are lighter and less expensive.

• Copper condensers are more commonly used in high-end air conditioners.

• Aluminium condensers are more commonly used in low to mid-range air conditioners.

• The choice between copper and aluminium condensers depends on factors like budget, efficiency requirements, and environmenta...read more

I will isolate the transformer and investigate the cause of the differential trip.

• Isolate the transformer from the system

• Check the differential relay settings and wiring

• Inspect the transformer for any physical damage or oil leaks

• Check the oil level and quality

• Investigate the cause of the differential trip

• Take corrective actions to prevent future trips

Temperature sensors measure the temperature of a machine and provide data for monitoring and control.

• Temperature sensors are used in machines to monitor and control temperature

• They provide data for maintenance and troubleshooting

• They can prevent overheating and damage to the machine

• Examples include thermocouples, RTDs, and thermistors

Diamond is the hardest material known to man.

• Diamond is the hardest natural material on Earth.

• Hardness is measured on the Mohs scale, with diamond being a 10.

• Other hard materials include silicon carbide and boron nitride.

Dell is a computer technology company known for its hardware products. 'No boot' refers to a computer issue where the system fails to start up properly.

• Dell is a well-known computer technology company that produces hardware products such as laptops, desktops, and servers.

• 'No boot' is a common issue where a computer fails to start up properly, often due to hardware or software problems.

• This issue can be caused by factors such as a corrupted operating system, faulty hardware co...read more

HVAC systems include various types designed for heating, ventilation, and air conditioning in residential and commercial settings.

• 1. Split Systems: Common in residential settings, consisting of an indoor and outdoor unit.

• 2. Central Air Conditioning: Uses ductwork to distribute cool air throughout a building.

• 3. Ductless Mini-Split: Ideal for homes without ductwork, providing flexibility in installation.

• 4. Packaged HVAC: All-in-one units often used in commercial buildings, comb...read more

I have 11 years and 1 month of experience operating packing machines.

• Extensive experience in setting up, calibrating, and operating various types of packing machines

• Proficient in troubleshooting and resolving issues with packing machines to ensure smooth operation

• Trained in following safety protocols and maintaining cleanliness of packing machines

• Implemented efficiency improvements in packing processes to increase productivity

• Collaborated with team members to meet production ...read more

Sewage Treatment Plants (STP) treat wastewater, while Water Treatment Plants (WTP) purify drinking water for public use.

• STPs remove contaminants from sewage through physical, chemical, and biological processes.

• WTPs use filtration, sedimentation, and disinfection to ensure safe drinking water.

• Example of STP process: Activated sludge method, where microorganisms digest organic matter.

• Example of WTP process: Chlorination, which kills harmful bacteria and viruses in water.

Compressors are devices that increase gas pressure by reducing its volume, essential in various applications.

• Compressors operate on the principle of Boyle's Law, where pressure increases as volume decreases.

• There are two main types: positive displacement compressors (e.g., reciprocating compressors) and dynamic compressors (e.g., centrifugal compressors).

• Positive displacement compressors trap a fixed volume of air and compress it, while dynamic compressors use high-speed rota...read more

I have extensive experience in electrical wiring, including installation, troubleshooting, and maintenance of various systems.

• Installed residential wiring systems, ensuring compliance with local codes and safety standards.

• Conducted troubleshooting for electrical faults, identifying issues in wiring and replacing damaged components.

• Worked on commercial projects, wiring lighting systems and power distribution panels.

• Collaborated with engineers to design wiring layouts for new c...read more

HVAC stands for Heating, Ventilation, and Air Conditioning, essential for indoor climate control.

• Heating: Systems like furnaces and heat pumps maintain comfortable indoor temperatures.

• Ventilation: Ensures fresh air circulation, using exhaust fans and air ducts to remove stale air.

• Air Conditioning: Cools indoor spaces using refrigerants and evaporator coils to remove heat.

• Regular maintenance checklists include filter replacements, duct cleaning, and system inspections.

• Example ...read more

Effluent Treatment Plants (ETPs) treat wastewater to remove contaminants before discharge or reuse.

• Primary Treatment: Involves physical processes like screening and sedimentation to remove large solids.

• Secondary Treatment: Biological processes, such as activated sludge, use microorganisms to degrade organic matter.

• Tertiary Treatment: Advanced methods like filtration and disinfection (e.g., chlorination) to remove remaining impurities.

• Sludge Management: Involves thickening, di...read more

Regular tasks for diesel generators include maintenance, inspections, troubleshooting, and ensuring optimal performance.

• Conduct routine maintenance checks, such as oil and filter changes, to ensure engine longevity.

• Perform load testing to verify that the generator can handle its rated capacity.

• Inspect fuel systems for leaks and ensure proper fuel quality to prevent engine issues.

• Monitor battery health and charging systems to ensure reliable starting.

• Check coolant levels and i...read more

Suction shell and pressure shell are components of a centrifugal pump.

• Suction shell is the part of the pump that houses the impeller and creates a low-pressure area to draw in fluid.

• Pressure shell is the part of the pump that contains the discharge nozzle and creates a high-pressure area to push out fluid.

• The two shells are separated by the impeller, which rotates to move fluid from the suction shell to the pressure shell.

• Suction shell is also known as the volute, while press...read more

A short burn in commercial machines typically occurs at high temperatures and pressures, leading to equipment failure.

• Short burns can occur at temperatures above 200°C (392°F) in machines like compressors.

• Pressure levels exceeding 150 psi can contribute to overheating and short burns.

• Examples include electric motors overheating due to high load conditions.

• Regular maintenance can help prevent short burns by ensuring proper cooling and pressure regulation.

A fully automatic milk dispensing machine streamlines the process of serving milk with precision and efficiency.

• 1. User Interface: Customers select their desired milk type and quantity via a touchscreen.

• 2. Milk Storage: The machine has refrigerated tanks to keep milk fresh and at the right temperature.

• 3. Dispensing Mechanism: A pump system accurately dispenses the selected amount of milk into a container.

• 4. Hygiene Measures: The machine includes self-cleaning features to main...read more

Common malfunctions in MGPS include leaks, pressure drops, and valve failures, impacting patient safety and care.

• Leaks in the pipeline can lead to gas loss and reduced supply pressure, affecting the availability of medical gases.

• Pressure drops may occur due to blockages or faulty regulators, compromising the delivery of gases like oxygen.

• Valve failures can prevent the proper flow of gases, leading to interruptions in patient treatment.

• Contamination of gas lines can occur if p...read more

Weight variation in capsule filling machine can be solved by calibrating the machine, checking the quality of raw materials, and optimizing the filling process.

• Calibrate the machine regularly to ensure accurate weighing.

• Check the quality of raw materials to ensure consistency in weight.

• Optimize the filling process by adjusting speed, vibration, and compression.

• Implement quality control measures to detect and reject capsules with weight variations.

• Train operators to follow pro...read more

Yes, I have practically handled major overhauling work on rotary pumps.

• Performed disassembly and reassembly of rotary pumps for maintenance and repair

• Replaced worn out parts such as seals, bearings, and impellers

• Inspected and tested pump components to ensure proper functioning

• Adjusted pump settings and alignments for optimal performance

• Trained junior technicians on rotary pump overhauling procedures

There are three main types of solutions used in coating: solvent-based, water-based, and powder coatings.

• Solvent-based solutions use organic solvents to dissolve the coating material.

• Water-based solutions use water as the main solvent for the coating material.

• Powder coatings are applied as dry powder and then cured under heat to form a hard finish.