Practice Test Geeks(AET) Aircraft Electronics Technician Practice Test
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AET Aircraft Power Systems Flashcards

7 cards from real AET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 AET Aircraft Power Systems flashcards as text

  1. What is the primary purpose of a voltage regulator in an aircraft electrical system?

    Answer: Maintain constant output voltage despite load variations

    A voltage regulator maintains a constant output voltage from the generator regardless of changes in engine speed or electrical load.

  2. In a three-phase AC aircraft generator, the phases are separated by how many electrical degrees?

    Answer: 120 degrees

    In a three-phase AC generator, the three windings are physically and electrically spaced 120 degrees apart to produce balanced three-phase power.

  3. Which type of battery is most commonly used as a primary backup power source in modern transport-category aircraft?

    Answer: Nickel-cadmium (NiCd)

    Nickel-cadmium batteries are preferred in transport-category aircraft for their high discharge rate capability, long cycle life, and reliability under extreme temperatures.

  4. What does the term 'paralleling' mean when applied to aircraft AC generators?

    Answer: Synchronizing and connecting multiple generators to share load equally

    Paralleling AC generators means synchronizing their frequency, phase, and voltage so they can be connected together and share the electrical load equally.

  5. A current transformer (CT) in an aircraft AC power system is primarily used for:

    Answer: Measuring load current without breaking the circuit

    Current transformers allow current monitoring by inducing a proportional secondary current, enabling measurement without interrupting the high-current circuit.

  6. What is the nominal frequency of AC power produced by most commercial aircraft generators?

    Answer: 400 Hz

    Aircraft AC generators produce power at 400 Hz, which allows smaller, lighter transformers and motors compared to the 60 Hz used in commercial ground power.

  7. In an aircraft bus tie system, what is the function of a Bus Tie Breaker (BTB)?

    Answer: Connect or isolate AC buses to allow power transfer between sources

    A Bus Tie Breaker connects two AC buses together, allowing one generator to power both buses if one generator fails.