30 Questions
What does the equalising coil do in each voltage regulator?
Strengthen or weaken the effect of the voltage coil
How is load current shared equally among generators?
By controlling generator output voltages
What causes a potential difference between the negative terminals of generators?
Difference in load current
What is the purpose of the low-resistance shunt in the ground lead of each generator?
Create a potential difference between generators
In which regulator type does the regulator control battery positive going to the field winding?
Grounded field type
What is the function of the grounded regulator type in generators?
Controls battery ground to field winding
What will happen if both generators become inoperative?
Essential AC loads will be supplied by the static inverter
What is the purpose of the changeover relay between the no. 1 generator bus and the essential AC bus?
To supply essential AC loads with power from the static inverter
What will happen if the system operates for a long period of time under certain conditions?
The battery will become discharged
What happens when the circuit's battery relay is turned 'off'?
The aircraft operates on emergency DC power only
Why is there confusion surrounding relays and solenoids in aircraft systems?
They are used interchangeably by aircraft manufacturers
What are relays usually used for in aircraft systems?
Low-current switching applications
What is used as a return path to the battery in aircraft electrical systems?
Metallic portion of the aircraft structure
Which manuals provide reference to electrical power during aircraft maintenance?
Aircraft Maintenance Manual, The Wiring Diagrams Manual
Which ATA chapters do transport aircraft maintenance manuals comply with for electrical power systems?
ATA 20 Standard Practices and ATA 24 Electrical Power
What type of system do aircraft, almost without exception, use for electrical returns?
Negative-ground or single-wire earth return system
What type of power does a typical large aircraft electrical power system make and supply?
AC and DC power
What provides normal and emergency power in an aircraft's electrical system?
Standby AC and/or DC system
What is the main function of the filter in a static inverter?
To provide a clean DC voltage to the 400 Hz oscillator
Which component ensures that static inverters maintain the correct voltage and frequency?
Regulator circuit
What is the purpose of the harmonic filter in a static inverter?
Removes everything that is not 400 Hz
How do transformers allow the values of AC voltage and current to be changed?
Using mutual inductance
What is responsible for conditioning the signal for use as a pure sine wave in a static inverter?
Harmonic filter
Why should static inverters be sent to an approved facility for repairs?
To ensure the correct work is performed on them
What is the main purpose of using current limiters in large aircraft?
To protect the aircraft's power distribution leads
How does a circuit breaker differ from a fuse in terms of functionality?
A fuse destroys itself while a circuit breaker can be reset
Which component houses the spring-biased moving magnetic core inside a magnetic circuit breaker?
Non-magnetic delay tube
What happens to the core of a magnetic circuit breaker when the circuit's current exceeds the rated current?
The core moves towards the pole piece
What does the armature do in a magnetic circuit breaker?
Links the contacts to the coil mechanism
How does a magnetic circuit breaker respond to an increase in current above its rated level?
Magnetic field strength increases
Test your knowledge on the maintenance procedures of aircraft electrical power systems. Learn about the manuals and specifications followed in the maintenance of transport aircraft electrical systems.
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