How are the two DC generators on a twin-engine aircraft typically connected to power the electrical loads?

• A. In series
• B. In parallel
• C. In a stacked arrangement
• D. One at a time

Answer: (B)

Power is provided to a common DC bus by both generators connected in parallel. This lets each generator contribute current to the same loads and keeps the bus voltage steady even if one unit changes speed or fails. Each generator is regulated to the same nominal voltage, and the control system coordinates load sharing so neither unit is overworked. Keeping the sources in parallel also allows a seamless transfer of load if one generator goes offline, maintaining electrical power for essential systems. In contrast, connecting generators in series would raise the voltage level beyond what loads expect and complicate regulation, while one-at-a-time operation wastes capacity and offers less reliability.