40+ Testing & Commissioning Engineer Interview Questions and Answers

The first step would be to investigate the cause of the secondary core of ct being open while the feeder is still working on very less load.

• Check for any loose connections in the secondary core of ct

• Inspect for any damage or faults in the secondary core of ct

• Verify the load on the feeder to ensure it is within normal operating range

• Consult with colleagues or experts for further troubleshooting steps

An Electrical Engineer is a professional who designs, develops, and maintains electrical systems and equipment.

• Electrical engineers work on various projects such as power generation, transmission, and distribution systems.

• They design and analyze electrical circuits and systems to ensure their efficiency and safety.

• They may specialize in areas such as power electronics, control systems, or telecommunications.

• Electrical engineers often collaborate with other professionals, such...read more

Tan delta test is used to measure insulation quality of transformer. GST and GSTg modes differ in the type of voltage applied.

• Tan delta test measures the power loss in transformer insulation.

• It helps to identify the presence of moisture, oil, or other contaminants in the insulation.

• GST mode applies AC voltage to the transformer while GSTg mode applies DC voltage.

• GSTg mode is more sensitive to insulation defects than GST mode.

• The test is important for ensuring the reliability ...read more

LIBBP and HIBBP stability and sensitivity refer to protection schemes for electrical systems. Implementing logic for one incomer and three outgoing feeders involves setting up coordination and communication between devices. BBP protection testing ensures the system operates correctly under fault conditions.

• LIBBP and HIBBP stability and sensitivity are important for ensuring reliable protection of electrical systems.

• Implementing logic for one incomer and three outgoing feeders...read more

SFRA stands for Sweep Frequency Response Analysis. It is a test used to analyze the frequency response of transformers.

• SFRA is a non-invasive test used to detect winding deformation, core movement, and other mechanical issues in transformers.

• The test involves sweeping a frequency range and measuring the response of the transformer.

• The results are plotted on a graph, which can be used to identify any abnormalities in the transformer's frequency response.

• The graph is read by an...read more

ATS stands for Automatic Transfer Switch. It is used to automatically switch between primary and backup power sources.

• ATS is a device used to switch between primary and backup power sources in case of power failure.

• To configure ATS relay, you need to set the parameters such as voltage, frequency, and delay timings.

• Trip selection refers to the setting that determines when the ATS will switch between power sources based on certain conditions.

• Examples of trip selection criteria ...read more

Yes, as a Testing & Commissioning Engineer, I am aware of the works being done on site by an electrical engineer.

• As a Testing & Commissioning Engineer, I am responsible for ensuring that electrical systems are installed correctly and functioning properly.

• I work closely with electrical engineers to test and commission various electrical systems, such as power distribution, lighting, and control systems.

• I am familiar with the design, installation, and operation of electrical sy...read more

It depends on various factors such as location, cost, efficiency, and environmental impact.

• Solar energy is renewable and environmentally friendly, but it can be intermittent depending on weather conditions.

• Thermal energy production can be more reliable and consistent, but it may have higher initial costs and environmental impacts.

• The choice between solar and thermal energy production should be based on specific project requirements and goals.

• Factors to consider include locati...read more

I have 5 years of experience in substation network.

• I have worked on various substation projects, including design, testing, and commissioning.

• I have experience with different types of substation equipment and systems.

• I have successfully completed multiple substation network projects on time and within budget.

Digital inputs and outputs in PLCs work by receiving or sending binary signals, PLC scanning time is the time taken for the PLC to complete one scan cycle, PLCs have different types of timers for various functions, Interlocking in PLCs is achieved through logical programming.

• Digital inputs in PLCs receive binary signals from sensors or switches

• Digital outputs in PLCs send binary signals to actuators or devices

• PLC scanning time is the time taken for the PLC to complete one sca...read more

Swapping two numbers without using inbuilt functions can be achieved using arithmetic operations.

• Create a temporary variable to store one of the numbers.

• Assign the value of the first number to the second number.

• Assign the value of the temporary variable to the first number.

Protection devices are devices used to protect electrical systems from faults and overloads.

• Overcurrent relays

• Differential relays

• Distance relays

• Earth fault relays

• Under voltage relays

Electrical engineering deals with the generation, transmission, and distribution of electrical power, while electronics engineering focuses on electronic devices and circuits.

• Electrical engineering primarily deals with large-scale power generation, transmission, and distribution systems.

• Electronics engineering focuses on small-scale electronic devices, circuits, and systems.

• Electrical engineering involves working with power generation plants, substations, and power lines.

• Elec...read more

alfanar Saudi Arabia is a leading electrical engineering company in the Middle East.

• alfanar Saudi Arabia specializes in electrical engineering solutions.

• They offer a wide range of products and services including power distribution, control panels, and lighting solutions.

• The company has a strong presence in the Middle East and has completed numerous projects in the region.

• alfanar Saudi Arabia is known for its quality and reliability in the field of electrical engineering.

Dispatch signals are signals sent to initiate a specific action or task, while receiving signals are signals received to acknowledge or respond to a dispatched signal.

• Dispatch signals are used to trigger a process or task.

• Receiving signals are used to acknowledge or respond to a dispatched signal.

• Dispatch signals can be in the form of electrical, digital, or wireless signals.

• Receiving signals can be in the form of confirmation messages, acknowledgments, or feedback.

• Dispatch s...read more

Access control system, Fire alarm system, HVAC, VESDA are all essential components of building infrastructure.

• Access control system: regulates who can enter or exit a building or specific areas within a building.

• Fire alarm system: detects and alerts occupants of a building in case of fire or smoke.

• HVAC (Heating, Ventilation, and Air Conditioning): controls the temperature, humidity, and air quality within a building.

• VESDA (Very Early Smoke Detection Apparatus): provides early...read more

I am a Testing & Commissioning Engineer with experience in various industries.

• I have a degree in Electrical Engineering

• I have worked on projects in the power generation industry

• I have experience in testing and commissioning of electrical systems

• I am familiar with various testing equipment and software

• I have worked on projects in the oil and gas industry

Relays and timers are electrical devices used to control the flow of electricity in a circuit. They work by opening or closing contacts based on specific conditions.

• Relays are electromechanical devices that use an electromagnet to open or close electrical contacts. They are used to control high voltage circuits with low voltage signals.

• Timers are devices that control the timing of events in a circuit. They can be digital or analog and are used to delay or sequence actions.

• Int...read more

Real power is the actual power consumed by a circuit, while apparent power is the combination of real power and reactive power.

• Real power is the power actually consumed by a circuit to perform work.

• Apparent power is the combination of real power and reactive power in a circuit.

• Real power is measured in watts (W), while apparent power is measured in volt-amperes (VA).

• The relationship between real power, apparent power, and power factor is given by the equation: Real Power = Ap...read more

The scope of work in a chiller plant includes installation, maintenance, troubleshooting, and optimization of chiller systems.

• Installation of chiller units and associated equipment

• Regular maintenance to ensure optimal performance

• Troubleshooting issues such as leaks, malfunctions, or inefficiencies

• Optimizing chiller plant operations for energy efficiency

• Ensuring compliance with safety and environmental regulations

• Monitoring and controlling chiller plant parameters

• Training staf...read more

Various types of electrical equipment include transformers, generators, circuit breakers, relays, and switchgear.

• Transformers

• Generators

• Circuit breakers

• Relays

• Switchgear

Yes, I am willing and able to go to remote locations for testing and commissioning work.

• I have experience working in remote locations and am comfortable with the challenges that come with it.

• I am willing to travel and stay on site for extended periods of time if necessary.

• I understand the importance of thorough testing and commissioning and am committed to ensuring that the work is done properly, regardless of location.

• I am familiar with the necessary safety protocols and pro...read more

E-mobility refers to the use of electric vehicles and related infrastructure for transportation.

• E-mobility is a growing trend in the automotive industry.

• It involves the use of electric vehicles (EVs) powered by batteries or fuel cells.

• E-mobility aims to reduce carbon emissions and dependence on fossil fuels.

• It requires the development of charging infrastructure, such as charging stations.

• E-mobility also includes the integration of renewable energy sources for charging EVs.

• Exa...read more

The principles of testing involve thorough planning, clear objectives, systematic approach, documentation, and validation.

• Thorough planning is essential to identify test objectives, scope, resources, and timelines.

• Clear objectives help in defining what needs to be tested and the expected outcomes.

• A systematic approach ensures that tests are conducted in a structured manner to achieve reliable results.

• Documentation of test plans, procedures, and results is crucial for traceabi...read more

Improving knowledge requires continuous learning and seeking new experiences.

• Read books and articles on relevant topics

• Attend workshops, seminars, and conferences

• Take online courses and tutorials

• Join professional organizations and networking groups

• Seek mentorship and guidance from experienced professionals

• Engage in hands-on learning and experimentation

• Reflect on past experiences and learn from mistakes

• Stay up-to-date with industry trends and advancements

Circuit breaker is used to protect electrical circuits from damage caused by overload or short circuit, while isolator is used to isolate a circuit for maintenance or repair.

• Circuit breaker is designed to automatically open and close the circuit in case of overload or short circuit.

• Isolator is manually operated to disconnect a circuit for maintenance or repair.

• Circuit breaker is a safety device, while isolator is a switching device.

• Examples: MCB (Miniature Circuit Breaker) is...read more

Logic gates are fundamental building blocks of digital circuits that perform logical operations based on input signals.

• Logic gates include AND, OR, NOT, NAND, NOR, XOR, and XNOR gates.

• Truth table shows the output of a logic gate for all possible input combinations.

• Example: Truth table for an AND gate - Input A, Input B, Output; 0, 0, 0; 0, 1, 0; 1, 0, 0; 1, 1, 1.