Power System Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. Explain the concept of load shedding in power systems.
Load shedding is the intentional reduction of electric power to avoid a total blackout when the demand exceeds the available generation capacity. It helps in maintaining the balance between generation and demand.
Ques 2. Define the term 'power factor' in the context of power systems.
Power factor is the ratio of real power (kW) to apparent power (kVA) in an AC circuit. It indicates how effectively electrical power is being converted into useful work and is represented as the cosine of the angle between voltage and current waveforms.
Ques 3. What is the significance of the Busbar in a substation?
A busbar is a conductive bar that serves as a common connection point for multiple incoming and outgoing electrical circuits in a substation. It plays a crucial role in distributing electrical power and maintaining the stability of the system.
Ques 4. Explain the difference between transmission and distribution in power systems.
Transmission involves the bulk transfer of high-voltage electric power over long distances from power plants to substations. Distribution, on the other hand, is the delivery of lower-voltage power from substations to end-users, such as homes and businesses.
Ques 5. Explain the purpose of a relay in a power system.
A relay is a protective device that detects abnormal conditions, such as overloads or faults, and triggers the isolation of the affected circuit. It plays a crucial role in maintaining system reliability and preventing damage to equipment.
Ques 6. Discuss the advantages and disadvantages of overhead power transmission lines.
Overhead power transmission lines are cost-effective and have lower losses but are susceptible to weather-related damage and visual impact. They are suitable for long-distance transmission but may face challenges in densely populated areas.
Ques 7. Discuss the role of renewable energy sources in modern power systems.
Renewable energy sources, such as solar and wind, play a crucial role in diversifying the energy mix and reducing dependence on fossil fuels. They contribute to sustainability goals and help mitigate environmental impact.
Ques 8. Explain the concept of power quality in power systems.
Power quality refers to the stability and reliability of the voltage and current supplied to electrical devices. Poor power quality can lead to equipment malfunctions, and measures are taken to ensure a consistent and high-quality power supply.
Most helpful rated by users:
- Explain the difference between transmission and distribution in power systems.
- Explain the concept of power quality in power systems.
- Explain the concept of load shedding in power systems.
- What is the significance of the Busbar in a substation?
- What is a synchronous generator, and how does it differ from an asynchronous generator?
Related interview subjects
| Electrical Machines interview questions and answers - Total 29 questions |
| Data Engineer interview questions and answers - Total 30 questions |
| Robotics interview questions and answers - Total 28 questions |
| AutoCAD interview questions and answers - Total 30 questions |
| Power System interview questions and answers - Total 28 questions |
| Electrical Engineering interview questions and answers - Total 30 questions |
| Verilog interview questions and answers - Total 30 questions |
| Software Engineering interview questions and answers - Total 27 questions |
| MATLAB interview questions and answers - Total 25 questions |
| Digital Electronics interview questions and answers - Total 38 questions |
| VLSI interview questions and answers - Total 30 questions |
| Civil Engineering interview questions and answers - Total 30 questions |