AET AET Aircraft Power Systems 4

Question 1

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

Accepted Answer

Maintain constant output voltage despite load variations

Answer

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

Question 2

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

Accepted Answer

120 degrees

Answer

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

Question 3

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

Accepted Answer

Nickel-cadmium (NiCd)

Answer

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

Question 4

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

Accepted Answer

Synchronizing and connecting multiple generators to share load equally

Answer

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

Question 5

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

Accepted Answer

Measuring load current without breaking the circuit

Answer

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

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET AET Aircraft Power Systems 4