Electrical Flashcards
If the permanent magnet generators are not available, the flight control electronics receive power from the:
• FO’s flight instrument bus.
• 28v DC system and main battery.
• Captain’s flight instrument bus.
• directly from the EEC electronics units.
• 28v DC system and main battery.
What is the minimum number of external power sources required for an external power ONLY engine start?
• Two (Either forward and the aft external)
• Three
• Engine start is not available on external power only
• Two (L&R Fwd)
• Two (L&R Fwd)
The ground handling mode is powered when ___ if no other power source is available.
• both forward external power sources are in use (ON)
• either FWD external power is connected (AVAIL)
• only AFT external power is connected (AVAIL)
• the battery switch is ON
• either FWD external power is connected (AVAIL)
The generator drive may disconnect automatically ____
• only on the ground
• due to excessive frequency variations
• due to bearing failure
• depending on the fault condition detected
• depending on the fault condition detected
How can the flight crew determine circuit breaker status?
• Check the CBIC display.
• Check the Status page display.
• Check the Electrical synoptic.
• Open CBs automatically display on EICAS.
• Check the CBIC display.
What is the purpose of the permanent magnet generators (PMGs)?
A. Powers the Captain’s standby electrical system.
B. Powers the hot battery buss and main battery charger.
C. Powers the flight control electronics.
D. All the above.
C. Powers the flight control electronics.
The main battery provides power to the following:
A. electric braking (as backup source).
B. The Captain’s Flight instrument bus until RAT deployment
C. Towing and refueling operations
D. All the above
D. All the above
The illuminated “AVAIL” light on the FWD or AFT external power switches indicate:
• External power is plugged in and voltage and frequency are within limits.
• External power is plugged in and is being used.
• AC busses have lost all power and are looking for an external power source.
• The system is available for external power to be plugged in.
• External power is plugged in and voltage and frequency are within limits.
Which of the following is true with regard to loss of two Starter Generators (SGs) in flight?
A. APU will Auto Start.
B. RAT will deploy.
C. First Officer’s flight instruments will be unpowered.
D. Some load shedding will occur.
D. Some load shedding will occur.
Electronic Circuit Breakers can be opened or closed using CBIC on the ground or in flight.
A. True
B. False
A. True
Which circuit breaker types may be reset via CBIC?
A. Thermal
B. Electronic
C. Both A and B are correct
D. Circuit breakers cannot be reset via CBIC
B. Electronic
Which of the following conditions will cause the RAT to deploy automatically in flight?
• Loss of the R 1 bus.
• Loss of the L2 bus with BAT LOW EICAS message.
• Loss of two starter generators
• Loss of all electrical power to the Capt’s and FO’s flight instruments
• Loss of all electrical power to the Capt’s and FO’s flight instruments
To remain within the capacity of the available power sources, __ will occur.
• Load Inhibit
• Non-essential circuit breakers will open as needed
• APU autostart
• Load Shedding
• Load Shedding
If a loss of all electrical power to Capt’s and FO’s flight instruments occurs in flight, the ____ provides Standby Power until RAT deployment.
• Main battery
• APU battery
• PMGs
• Dedicated standby power bus batteries
• Main battery
Which of the following indications will display during automatic load shedding?
A. LOAD SHED is displayed next the affected equipment symbol on the
appropriate system synoptic.
B. “LOAD SHED” EICAS message displays.
C. a list of affected aircraft systems on the electrical synoptic.
D. Both A and C are correct.
D. Both A and C are correct.