Electrical Flashcards
With Standby Power OFF Light illuminated , you could power the standby busses directly from the battery by ____.
placing the standby power switch to BAT
DC power is supplied by ____.
transformer rectifier units, the battery charger, and the battery
Normally, the AC electrical system is run ____.
isolated
The static inverter is powered by ____.
the battery
The Ground Service Switch is located _________________.
on the forward attendant panel
The DC Cross Bus Tie Relay will open ____.
at glideslope capture during a flight director or autopilot ILS approach
Circuit breakers are allowed to be pulled and reset ____.
only if specified in a QRH procedure
After engine start, the crew forgets to put the generators on line and uses the APU to power the Transfer Busses for takeoff. If the APU fails, the ____.
generators are automatically placed on line
On the ground with the APU powering the electrical systems, the APU GEN OFF BUS light will be _____.
OFF
When moved to OFF, the BUS TRANSFER switch will ____.
isolate the AC and DC Busses on Electrical System 1 from the AC and DC Busses on Electrical System 2
In a normally operating AC electrical system, if the Bus Transfer Switch is moved to OFF, ____.
and if a generator subsequently fails, the bus ties will not close to transfer power
If the Standby Power “OFF” light illuminates, it means ____ is/are not powered.
- the AC Standby Bus
- the DC Standby Bus
- the Battery Bus
With standby electrical power only, the Captain will be able to fly _____ instrument approaches.
all
The AC standby bus can be powered by ____ if its normal power source fails.
the battery (through the static inverter)
During an ILS approach, the cross bus tie relay automatically opens at glideslope capture to ____.
prevent single bus failure from affecting both navigation receivers and flight control computers
With a normally operating electrical system, placing the Battery Switch OFF ____.
removes power to the Battery Bus and the Switched Hot Battery Bus
The DC Standby Bus can be powered by ____.
TR1, TR2, TR3, and the battery
Under what conditions can External power power one AC Transfer Bus, and the APU the other Transfer Bus ?
No condition. The electrical system will not allow it.
What does an illuminated ELEC light, on the AC and DC Metering Panel, mean?
A Standby Power or DC system fault has occurred.
The BAT DISCHARGE Light illuminated indicates excessive battery discharge is detected with the battery switch on. How long will the battery provide power?
A fully charged battery provides a minimum of 30 minutes of standby power.
If the TR Unit light illuminates, inflight, it means ____ have failed.
TR1 has failed or TR2 and TR3
If the TR Unit light illuminates on the ground, it means ____ has/have failed.
any TR unit
In flight, if an engine generator fails, load shedding ____.
is designed to shed electrical load incrementally
