FAA Powerplant Written Practice Test

What components are found in a turbine engine exciter unit?

1. One transformer and one storage capacitor

2. Two transformers and two storage capacitors

3. Three transformers and one storage capacitor

4. Only storage capacitors

The correct answer is: Two transformers and two storage capacitors

In a turbine engine exciter unit, the correct configuration includes two transformers and two storage capacitors. This setup is essential for generating and supplying the high-voltage, high-frequency electrical signals needed to ignite the fuel-air mixture in the combustion chamber. The transformers play a crucial role in stepping up the voltage to the necessary levels for ignition, while the storage capacitors are used to store electrical energy and provide the necessary discharge for creating a spark at the spark plugs or igniters. This combination ensures that the igniter operates effectively and reliably under varying conditions in a turbine engine. This design allows for redundancy and reliability in the ignition process, as having two transformers and capacitors helps ensure that the system can still function properly even if one component were to fail, thereby increasing the overall safety and efficiency of the turbine engine.