Day 2 Progress Check Flashcards
What are the three main aspects of AC generator regulation that must be controlled?
Voltage, frequency, and phase relationship
What happens when the voltage of the generator drops in a transistorized voltage regulator system?
The capacitor becomes negative with respect to the resistor
Which component is responsible for automatically disconnecting a malfunctioning generator in-flight?
Generator Control Unit (GCU)
What is the advantage of using a brushless alternator in modern aircraft?
Increased reliability and reduced maintenance
What protection does the Generator Control Unit (GCU) provide?
Undervoltage and overvoltage protection, current limiting, frequency monitoring, and current differential detection
What principle does a brushless alternator operate on?
Magnetic induction similar to a transformer
What is a key feature of a constant speed drive (CSD) in relation to AC generator regulation?
It maintains a constant output frequency regardless of engine speed
Why is frequency control critical in aircraft AC generator systems?
Many electrical components are frequency sensitive and require precise frequency control to operate correctly
How does a transistorized voltage regulator enhance the reliability of an AC generator system?
By eliminating the need for mechanical switches
Why is power loss less with AC compared to DC in aircraft systems?
Power loss is proportional to current, and AC systems manage current more efficiently
What happens to the hydraulic fluid in a CSD when the generator is in an overspeed condition?
Hydraulic pistons activate in the reverse direction to decrease RPMs
How does the Generator Control Unit (GCU) respond to a detected fault in an AC generator?
It isolates the faulty generator and indicates the fault on the annunciator panel
What is the function of the Permanent Magnet Generator (PMG) in the excitation of a brushless alternator?
Induces current into the rotating field
In the event of a generator failure, how quickly does the Bus Power Control Unit isolate the defective generator and reconnect the load bus to another power source?
0.1 second
Which component in modern aircraft combines all necessary functions to regulate AC generators?
Generator Control Unit (GCU)
