Generation Flashcards
What is usually used to lubricate Integrated Driver Generators (IDGs)?
Internal oil
An inverter is a?
Unit used to convert DC into AC.
The APU of a large passenger jet airliner has its own AC generator that supplies the aircraft with?
Three-phase 115 V, 400 Hz AC.
An AC generator provides a constant output voltage, when the electrical load increases. What will the voltage regulator do?
Increase the excitation current.
The frequency of an AC generator is dependent on the?
Number of pairs of poles and the speed of the rotor.
A unit that converts DC into AC is?
An inverter.
In a modern transport aircraft, what happens in the event of a total AC generator failure?
A static inverter converts 24 V DC from the batteries to 115 V AC for essential AC Services
In an aircraft fitted with a constant frequency AC power supply, DC power is obtained from a?
Transformer rectifier unit (TRU).
In an AC system, what is a differential fault? It is a large difference between?
A generator and its busbar.
The frequency of the current provided by an alternator depends on?
Its rotation speed.
When the “disconnect” switch is activated on the electrical panel, it disconnects?
IDG from gearbox
A 3 phase AC generator has 3 separate stator windings spaced at?
120°
A starter-generator is an electrical generator that?
Performs as an electric motor during engine start.
What occurs during a DC Generator’s armature runaway?
Current decreases in the armature, and because it also decreases in the commutator, torque is reduced.
The primary function of a constant speed drive in an AC generating system is to?
Drive the generator at a constant speed.
What is a combination of an AC electric motor and a generator called?
A starter generator.
On an aircraft using AC as primary power supply, the batteries are charged in flight from?
A Transformer Rectifier Unit.
Assuming a constant speed drive (CSD) fault is indicated, the CSD should be disconnected provided?
The engine is running.
What is a voltage regulator used for? To control voltage from?
Generators during varying load and speed
What directly controls the power required for field excitation of the main rotor in modern constant-frequency alternators?
The voltage regulator.
During start of am engine fitted with a brushless AC generator, the initial excitation is provided by?
A set of permanent magnets.
“Frequency wild” in relation to a AC generation system means the generator?
Output frequency varies with engine speed.
