Which of the following actions can be performed by the Generator Control Units?

The Generator Control Units (GCUs) play a crucial role in the operation and management of electrical systems, particularly in maintaining the stability and efficiency of power supply. One of the key actions that GCUs perform is providing differential voltage comparison. This function helps ensure that the output voltage of the generators is balanced and meets the necessary requirements for the system's operational needs. By comparing the voltages, the GCUs can detect any discrepancies and adjust outputs accordingly to prevent overloads or failures in the electrical systems.

This action is vital for the proper functioning of the electrical distribution system within the overall framework of vehicle operation, especially in complex systems like those found in military vehicles such as the T-54A. The ability to provide differential voltage comparison maintains the integrity and reliability of power distribution, which is essential for all electrical components to function optimally.

In contrast, maintaining hydraulic pressure, controlling cabin climate, and regulating fuel flow are functions typically carried out by other systems within the vehicle. Each of these actions pertains to different aspects of vehicle operation that do not fall under the scope of the Generator Control Units.