Electrical Engineering XYZ MCQs
Which of the following faults is treated as external fault:
- Over voltage
- Failure of prime mover of the generator
- Failure of excitation
- All of these
Correct answer: 4. All of these
Explanation:
- Over voltage: An overvoltage is considered an external fault. This occurs when the voltage in a power system exceeds the normal or specified limits. Overvoltage can be caused by external factors such as lightning, switching operations, or faults in other parts of the power system.
- Failure of prime mover of the generator: The prime mover is the mechanical source of energy that drives the generator. If there is a failure in the prime mover (e.g., the engine in the case of a diesel generator), it is treated as an external fault because it is an issue external to the generator itself.
- Failure of excitation: The excitation system is responsible for providing the necessary field current to the generator’s rotor to produce electrical power. If there is a failure in the excitation system, it is also treated as an external fault because it is a problem external to the generator.
In summary, all the listed conditions (Over voltage, Failure of prime mover, and Failure of excitation) are treated as external faults in the context of power generation and distribution systems.