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Power System Interview Questions and Answers

Ques 1. What is the difference between real power and reactive power?

Real power is the actual power consumed by the load and measured in kilowatts (kW), while reactive power represents the non-working power due to the inductive or capacitive nature of the load and is measured in kilovolt-amperes reactive (kVAR).

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Ques 2. 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.

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Ques 3. What is a synchronous generator, and how does it differ from an asynchronous generator?

A synchronous generator produces electricity with a constant speed that is synchronized with the grid frequency, while an asynchronous generator (or induction generator) operates at variable speeds and does not need to be synchronized with the grid.

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Ques 4. 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.

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Ques 5. Explain the purpose of a transformer in a power system.

A transformer is used to change the voltage level of electric power for transmission and distribution. It consists of primary and secondary windings that are magnetically coupled, allowing for efficient voltage transformation with minimal power loss.

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