30 Questions
What is the source of power supplied to the essential AC and DC buses?
Three-phase 115-V AC at 400 Hz
In the event of power loss to the essential AC and DC main busbars, how is power supplied to the DC essential bus and AC ESS BUS?
By the battery via the static inverter and emergency bus supply contactor
What isolates the AC ESS bus shed network in the battery-only configuration?
Emergency bus supply contactor
What adjusts the field current in generators or alternators to maintain the required output voltage?
Voltage regulator
When are the AC ESS shed bus and DC ESS shed bus shed respectively?
When CSM/G is supplied by the RAT hydraulic pump
How is the battery connected to supply power to the AC ESS BUS and DC essential bus?
Through the static inverter and emergency bus supply contactor
What does the disconnect mechanism do in the event of a transmission malfunction?
De-couples the input shaft from the input spline shaft
How is reset accomplished for the disconnect mechanism with the engine stationary?
By pulling out on the reset handle until the solenoid snaps into position
What is the main cooling agent used in newer AC generators?
Oil
What is forced through older and/or less powerful generators as a cooling means?
Ram air
What happens when the driving dogs on the two shafts are separated?
The input spline shaft spins freely in the transmission without causing rotation
Which component sends oil through both the generator and an air/oil heat exchanger for cooling?
CSD
What is the purpose of the battery temperature monitor system in aircraft with Ni-cad batteries?
To provide continuous temperature indication of the battery
How many temperature sensors (thermistors) are present in each battery?
Two
Where are the two independent temperature sensors (thermistors) mounted within the battery?
On the intercell connector link of the battery
Why is adequate ventilation necessary for lead-acid batteries?
To remove hydrogen and oxygen gassing safely
How can a positive airflow ventilation system be created for the battery compartment?
By using the aircraft's airstream with a pick-up and outflow pipe through the aircraft's skin
What is the purpose of using a pick-up and outflow pipe through the aircraft's skin in relation to battery ventilation?
To safely remove gassing from lead acid batteries outside the aircraft
What happens to the terminal voltage of the generator as it comes up to speed?
It rises
When contact points C1 are separated, where does the field current flow through?
R1 and L2
What effect does adding resistance to the field circuit have on the generator?
Decreases terminal voltage
Why is L2 winding opposed to the L1 winding in the generator?
To neutralize the magnetic pull of L1
What is the purpose of the vibrator-type current limiter in the generator system?
To limit output current automatically
Where is L3 located in relation to the main line and load in the generator system?
In series with the load
What is the reason vibrating-type regulators and three-unit regulators cannot be used with generators requiring high field current?
They may cause pitting or burning of contacts
Why do heavy-duty generator systems require a different type of regulator, such as the carbon-pile voltage regulator?
To regulate the generator terminal voltage
What feature distinguishes a compound-wound generator from other types of generators?
Presence of both series and shunt field windings
What is the purpose of the radially arranged leaf springs in a carbon-pile voltage regulator?
To exert pressure against the contact plug
In older aircraft DC generating systems, which type of regulator would typically be used?
Carbon-pile voltage regulator
Why is a carbon pile named as such in the carbon-pile voltage regulator?
Because it consists of hard carbon and soft carbon discs in a stack
Learn about the battery temperature monitor system used in aeroplanes with Ni-cad batteries. Understand how this system provides continuous temperature indication and warns of high temperature conditions. Training materials for CASA Part 66.
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