L&T Technology Services Senior Electrical Engineer Interview Questions and Answers

VFD is a device used to control the speed of an electric motor. LV panels are used to distribute power to various loads.

• VFD works by adjusting the frequency of the power supplied to the motor, which in turn controls its speed.

• LV panels are designed to distribute power to various loads in a safe and efficient manner.

• Design of LV panels involves selecting appropriate components such as circuit breakers, fuses, and contac...read more

Various standards are used in electrical design depending on the country, industry, and application.

• National Electrical Code (NEC) is used in the United States

• International Electrotechnical Commission (IEC) standards are used globally

• In the automotive industry, ISO 26262 is used for functional safety

• In the aerospace industry, DO-254 is used for airborne electronic hardware

• Standards are also specific to certain applicat...read more

We are using IEC 61439 standard for designing the panels and selecting switchgear.

• IEC 61439 is the international standard for low-voltage switchgear and controlgear assemblies

• It provides guidelines for the design, manufacture, and testing of switchgear and controlgear assemblies

• The standard ensures safety, reliability, and performance of the switchgear and controlgear assemblies

• IEC 61439 is widely recognized and accept...read more

Control logic of electrical panel involves designing and implementing the logic for controlling various electrical components.

• Designing the logic for controlling electrical components such as motors, pumps, and valves

• Implementing the control logic using programmable logic controllers (PLCs) or other control systems

• Testing and troubleshooting the control logic to ensure proper operation

• Documenting the control logic for ...read more

VFDs control the speed of AC motors by varying the frequency and voltage of the power supplied to the motor.

• VFD stands for Variable Frequency Drive

• Basic components include rectifier, DC bus, inverter, and control system

• Parameters include frequency, voltage, current, and acceleration/deceleration time

• VFDs can improve energy efficiency and reduce wear and tear on motors

• Example: VFDs are commonly used in HVAC systems to c...read more

A soft starter panel is an electrical device used to control the starting current of an electric motor.

• It reduces the mechanical stress on the motor during startup.

• It gradually increases the voltage supplied to the motor.

• It can be used to control the speed of the motor.

• It is commonly used in applications where a large amount of power is required to start the motor.

• Examples include pumps, compressors, and conveyor belts...read more

We use various software depending on the type of electrical component being tested.

• We use simulation software like LTSpice and PSpice for circuit analysis.

• For testing microcontrollers, we use software like Keil and MPLAB.

• For power system analysis, we use software like ETAP and PowerWorld.

• We also use software like LabVIEW and MATLAB for data acquisition and analysis.

2 wire and 4 wire communication are methods used for transmitting data or signals between devices.

• 2 wire communication uses a single pair of wires for both transmitting and receiving data.

• 4 wire communication uses two pairs of wires, one for transmitting and one for receiving data.

• 2 wire communication is commonly used in simple applications like telephone lines.

• 4 wire communication is used in more complex applications ...read more

My team's strength lies in collaboration, expertise, and adaptability, which I manage through clear communication and empowerment.

• Diverse skill sets: Our team includes specialists in power systems, control systems, and electronics, allowing us to tackle complex projects.

• Regular meetings: We hold weekly check-ins to discuss progress, address challenges, and share insights, fostering open communication.

• Empowerment: I enc...read more