PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

What component protects each generator from over/under voltage and frequency?

1. Voltage Control Unit (VCU)

2. Generator Control Unit (GCU)

3. Power Supply Monitor (PSM)

4. Electrical Distribution Unit (EDU)

The correct answer is: Generator Control Unit (GCU)

The Generator Control Unit (GCU) is responsible for monitoring and protecting the generator from overvoltage, undervoltage, and overfrequency conditions. It ensures that the electrical output remains within acceptable limits for safe and efficient operation. The GCU continuously assesses the operational parameters of the generator, managing its performance by responding to variations in voltage and frequency, which can occur due to changes in load or other system conditions. The GCU plays a crucial role in maintaining generator integrity and preventing potential damage that could arise from operating outside of specified limits. This means that if the system detects conditions that fall outside the acceptable voltage or frequency range, the GCU can take corrective actions such as disconnecting the generator from the system to protect it. In contrast, while the Voltage Control Unit, Power Supply Monitor, and Electrical Distribution Unit also play important roles in the aircraft's electrical system, they do not specifically focus on the protective functions regarding over/under voltage and frequency for the generator in the same way as the GCU.