Which components make up the 400Hz system?

The components that make up the 400Hz system are vital for its operation, particularly in applications associated with aircraft electrical systems. A key component of this system is the rectifier, which converts alternating current (AC) from the generator to direct current (DC). This conversion is crucial as it provides the necessary electrical power flow for the subsequent components in the system.

Following the rectifier, the inverter plays a critical role by converting the DC back into AC at the required frequency of 400Hz. This frequency is essential for ensuring the efficient operation of aircraft systems and components, which are often designed for high-frequency inputs.

The master control is another important component. It regulates and monitors the operation of the 400Hz system, ensuring that the output voltage and frequency remain stable and within specified limits. It has critical functions in system management, including coordinating the other components and responding to operational changes.

By focusing on these specific components – rectifier, inverter, and master control – it's clear why this combination is identified as the correct structure for a 400Hz system. Other choices include terms that do not accurately represent the standard components typically associated with such a system, thus confirming the integrity of the stated answer.