The transformer-rectifier unit in aircraft power systems receives input from which source to supply DC to the DC buses?

The transformer-rectifier unit in aircraft power systems receives input from which source to supply DC to the DC buses?

• A. AC power from generators.
• B. Direct current from the main battery.
• C. Solar panels.
• D. Hydraulic power.

Answer: (C)

The transformer-rectifier unit is the bridge between the aircraft’s AC generation and the DC distribution. It takes the AC output from the engine-driven generators, uses a transformer to get the voltage at the proper level, and then rectifies that AC into DC to feed the DC buses. The resulting DC is smoothed and regulated to provide stable power for avionics and systems, and it can also help charge the main battery when needed. Solar panels do not feed the TRU in a typical aircraft electrical system; they produce DC separately and would generally connect to the battery or a dedicated regulator, not to the generator-derived input of the TRU. Hydraulic power is mechanical energy and cannot supply the DC buses directly.

The transformer-rectifier unit is the bridge between the aircraft’s AC generation and the DC distribution. It takes the AC output from the engine-driven generators, uses a transformer to get the voltage at the proper level, and then rectifies that AC into DC to feed the DC buses. The resulting DC is smoothed and regulated to provide stable power for avionics and systems, and it can also help charge the main battery when needed. Solar panels do not feed the TRU in a typical aircraft electrical system; they produce DC separately and would generally connect to the battery or a dedicated regulator, not to the generator-derived input of the TRU. Hydraulic power is mechanical energy and cannot supply the DC buses directly.