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AA787 > Electrical > Flashcards

Electrical Flashcards

1
Q

In addition to the traditional electrically powered systems, the 787 electrical system also powers…
- engine start and pressurization.
- wing ice protection and stabilizer trim.
- wheel brake systems.
- All of the above are correct.

A

All of the above are correct.

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2
Q

Engine and APU starter/generators function as electrically powered starter motors for start and generators once the engine or APU is running. There are a total of ___________________ starter/generators on the 787.
- 4 variable frequency
- 6 constant speed
- 4 constant speed
- 6 variable frequency

A

6 variable frequency

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3
Q

The engine starter generators are designated as…
- L1, L2, R1, R2.
- L1, L2, R3, R4.
- 1,2,3,4.
- left, left 1, right, right 2.

A

L1, L2, R1, R2.

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4
Q

During normal engine start only one starter/generator is used during the start. The other starter/generator is used as a backup.
- True
- False

A

False

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5
Q

The 115 Vac external power system consists of both a forward and aft system. How many receptacles are there for each system?
- Two forward, one aft
- Three forward, two aft
- One forward, two aft
- One forward, one aft

A

Two forward, one aft

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6
Q

The removal of electrical loads in order of priority to stay within the capacity of the available power sources is referred to as…
- battery shed.
- load priority.
- load inhibit.
- load shed.

A

load shed.

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7
Q

Three engine driven Permanent Magnet Generators (PMGs) are the primary source of power for the flight control electronics. A secondary source for control power is provided by…
- the Permanent Magnet Alternators (PMA).
- only the APU battery.
- the aircraft battery only.
- the 28 Vdc bus distribution system, and the main battery.

A

the 28 Vdc bus distribution system, and the main battery.

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8
Q

The Ram Air Turbine (RAT) serves as an emergency source of electrical and hydraulic power. It has no operating time limits, airspeeds or altitudes.
- True
- False

A

True

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9
Q

The main AC busses designated L1, L2, R1, and R2 provide…
- 115 Vac.
- 28 Vdc.
- 270 Vdc.
- 235 Vac.

A

235 Vac.

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10
Q

The aft external power system may be used as the sole electrical source to start the right engine first.
- True
- False

A

False

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11
Q

If electrical power is lost in flight, how is the aircraft powered during the time between the power loss and Ram Air Turbine (RAT) deployment?
- APU battery
- Permanent Magnet Generators (PMGs)
- Main battery
- Permanent Magnet Alternators (PMAs)

A

Main battery

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12
Q

Four engine starter/generators function as electrically powered starter motors for start and engine driven generators once the engines are running. The starter/generators are…
- variable frequency and utilize a CSD to provide stable output.
- directly connected to the engine gearboxes, producing variable power proportional to engine rotor speed.
- ganged in pairs through a hydro/electric motor drive.
- variable frequency utilizing the engine variable stator vanes to control output.

A

directly connected to the engine gearboxes, producing variable power proportional to engine rotor speed.

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13
Q

Circuit breakers cannot be opened or closed using the Circuit Breaker Indication and Control (CBIC) display in flight.
- True
- False

A

False

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14
Q

Each engine has two ______ variable frequency starter generators.
- 270 Vdc
- 115 Vac
- 28 Vdc
- 235 Vac

A

235 Vac

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15
Q

The APU battery functions automatically and has no power switch. The main battery assists the APU battery providing power for APU start.
- True
- False

A

True

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16
Q

In addition to traditional electrically powered systems, the B787 electrical system powers which of the following systems?
- Wing ice protection
- Pressurization
- Wheel brake
- All of the above.

A

All of the above.

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17
Q

Following the loss of all electrical power to the Captain’s and First Officer’s flight instruments in flight, what is the source of standby power until RAT deployment?
- Backup generators
- APU battery
- APU
- Main battery

A

Main battery

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18
Q

What is the primary source of power for the flight control electronics?
- Two Permanent Magnet Alternators (PMAs)
- Main battery
- 28 V DC distribution system
- Three Permanent Magnet Generators (PMGs)

A

Three Permanent Magnet Generators (PMGs)

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19
Q

With only forward external power selected ON, after the APU is started,…
- the buses remain powered by external power until the APU starter generators are manually selected on.
- the APU energizes the 235 Vac and 115 Vac system while external power continues to energize 28 Vdc system.
- the APU generators energize the four main 235 Vac buses, and external power transitions from ON to AVAIL.
- external power energizes the 115 Vac and 28 Vdc buses while the APU powers the 235 Vac busses.

A

the APU generators energize the four main 235 Vac buses, and external power transitions from ON to AVAIL.

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20
Q

Four electrical brake power supply units regulate power for the exclusive use of the airplane electric brake system. The primary and backup power source for the brakes are…
- the Large Motor Controller and APU battery respectively.
- the 115 Vac System and standby battery respectively.
- the 235 Vac System and standby battery respectively.
- the 28 Vdc bus system and main battery respectively.

A

the 28 Vdc bus system and main battery respectively.

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21
Q

How is the 28 Vdc system powered when the 235 Vac system is energized?
- Auto Transformer Units
- Power conversion devices
- Four DC generators
- Two standby inverters

A

Power conversion devices

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22
Q

How is the aft external power system used during engine start?
- It energizes only the motor controller required to perform a right engine start using external power as the sole power source.
- It provides backup power for use during a left engine start.
- It provides power to start the APU with external power.
- It provides power to the Power Electronics Cooling System (PECS) and the aft galley.

A

It energizes only the motor controller required to perform a right engine start using external power as the sole power source.

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23
Q

With no other power source connected which electrical mode is active when a single forward external power receptacle is connected but not selected ON?
- Ground Handling mode
- Standby Power mode
- Ground Service mode
- Towing Power mode

A

Ground Handling mode

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24
Q

What electrical power source becomes active if a loss of all electrical power to captain’s and first officer’s flight instruments occurs in flight?
- RPDUs
- Ram Air Turbine (RAT)
- Emergency Bus
- APU Generator(s)

A

Ram Air Turbine (RAT)

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25
Q

The electrical synoptic shows a list of airplane systems affected by load shedding. Equipment that is inhibited or shed is also indicated…
- by individual equipment caution messages.
- in the ECL Non-normal checklist.
- in white on the affected system synoptic (AIR, FUEL, & HYD).
- by an individual EICAS message.

A

in white on the affected system synoptic (AIR, FUEL, & HYD).

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26
Q

If the APU is not available, engine start may be accomplished using external power. At a minimum, ______________ external power source(s) is (are) required.
- one 90 kVA
- one 115 Vac
- two 90 kVA
- one 180 kVA

A

two 90 kVA

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27
Q

The Ram Air Turbine (RAT) deploys automatically with a loss of all electrical power to the captain’s and first officer’s flight instruments.
- True
- False

A

True

28
Q

The primary power distribution method energizes higher amperage loads directly from…
- Remote Power Distribution Units (RPDU).
- bus power panels located in forward and aft E/E bays.
- PCDs.
- starter/generators.

A

bus power panels located in forward and aft E/E bays.

29
Q

What is the power source for the braking system?
- Center hydraulic system
- Right hydraulic system
- 28 Vdc
- 115 Vac

A

28 Vdc

30
Q

The airplane’s use of variable frequency power requires large motor loads to be energized by motor controllers that condition that power for use. The heat created by these high voltage motor controllers is dissipated by the…
- Cabin Air Compressor (CAC) cooling air.
- Integrated Cooling System (ICS) cooling air.
- Miscellaneous Equipment Cooling System (MECS).
- Power Electronics Cooling System (PECS).

A

Power Electronics Cooling System (PECS).

31
Q

Flight deck control/indication, power transfer functions, and overall load management and protection for the electrical system is provided by the…
- Power Conversion Devices (PCD).
- Permanent Magnet Generators (PMG).
- battery bus.
- Bus Power Control Unit (BPCU).

A

Bus Power Control Unit (BPCU).

32
Q

Towing Power mode provides electrical power for brakes and limited lighting and communications capabilities. Towing Power mode is activated by…
- starting the APU.
- selecting the BATTERY switch ON.
- selecting EXTERNAL POWER switches ON.
- selecting the TOWING POWER switch ON.

A

selecting the TOWING POWER switch ON.

33
Q

The removal of electrical loads at predefined operational phases because the affected system is not required, or additional power is temporarily needed by another system is referred to as…
- load inhibit.
- load priority.
- load shed.
- battery shed.

A

load inhibit.

34
Q

A list of airplane systems affected by load shedding can be found on the…
- Electronic Checklist (ECL).
- electrical synoptic.
- Primary Flight Display (PFD).
- Navigation Display (ND).

A

electrical synoptic.

35
Q

Electrical power to some non-essential loads can be controlled from the flight deck overhead electrical panel. These include the In-Flight Entertainment system and the passenger seat system which are controlled by the_________ switch.
- FWD EXT PWR switch
- IFE/PASS SEATS
- CABIN/UTILITY
- BATTERY

A

IFE/PASS SEATS

36
Q

With the APU and engine generators off, the External Power On mode is active when…
- any external power source is connected with the associated AVAIL light illuminated.
- at least one forward external power receptacle is connected and selected ON.
- two external power sources are connected and associated AVAIL light is illuminated.
- only the aft external power source is connected and selected ON.

A

at least one forward external power receptacle is connected and selected ON.

37
Q

The Ground Service mode of the electrical system can be activated by a switch located on the…
- overhead panel.
- TCP panel.
- master attendant switch panel.
- ACP panel.

A

master attendant switch panel.

38
Q

Three engine driven Permanent Magnet Generators (PMGs) are the primary source of power for the…
- Electronic Engine Controllers.
- large motor controllers.
- flight control electronics.
- APU batteries.

A

flight control electronics.

39
Q
A
40
Q

Two engine driven Permanent Magnet Alternators (PMAs) (one per engine) are the primary source of power for the…
- large motor controllers.
- CACs.
- EECs.
- flight control electronics.

A

EECs.

41
Q

The four main 235 Vac buses are designated as…
- Bus 1, Bus 2, Bus 3, Bus 4.
- Fwd 1, Aft 2, Fwd 3, Aft 4.
- L1, L2, R1, R2.
- Primary AC 1, Primary AC 2, Secondary AC 3, Secondary AC.

A

L1, L2, R1, R2.

42
Q

A generator that has been disconnected from the engine by pushing the respective generator drive disconnect (DRIVE DISC) switch can subsequently be reconnected by the flight crew.
- True
- False

A

False

43
Q

An EICAS message, _______________ (L1, L2, R1, R2) requires the crew to disconnect the generator drive.
- DRIVE
- DRIVE DISC
- ELEC GEN DRIVE
- ELEC GEN OFF

A

ELEC GEN DRIVE

44
Q

The Circuit Breaker Indication and Control (CBIC) page can be shown on…
- any MFD.
- only the FO’s MFD.
- the left AUX display.
- only the Captain’s MFD.

A

any MFD.

45
Q

While towing the aircraft using the TOWING POWER switch, the current state of charge of the batteries can be observed on the…
- Electric synoptic.
- AUX panel.
- Towing Power panel.
- Electrical panel.

A

Towing Power panel.

46
Q

Electrical power for APU start can be provided by the APU battery, engine generated power or…
- forward external power.
- aft external power.
- aircraft PMAs.
- PMGs.

A

forward external power.

47
Q

For APU starts with the APU battery as the power source (no engine running and forward external power not ON), the right starter/generator is always used.
- True
- False

A

True

48
Q

In flight, which APU starter/generator is used to supply electrical power?
- Right
- One or both, depending on the electrical load requirements of the aircraft
- Both
- Left

A

One or both, depending on the electrical load requirements of the aircraft

49
Q

Two engine driven Permanent Magnet Alternators (PMAs) are the primary power source for the EECs. When a PMA is inoperative (including during engine start) a secondary source of power for the EECs is provided by the airplane’s…
- battery bus.
- 28 Vdc bus distribution system.
- 115 Vac bus distribution system.
- 235 Vac bus distribution system.

A

115 Vac bus distribution system.

50
Q

The majority of the airplane electrical loads are 115 Vac and 28 Vdc energized by the forward E/E bay power panels and Remote Power Distribution Units (RPDUs). A limited number of high voltage 235 Vac electrical loads are energized from the aft E/E bay. What changes power from one voltage or current type (AC/DC) to another?
- Remote Power Distribution Units (RPDU)
- Bus Power Control Unit (BPCU)
- Power conversion devices
- Large motor controllers

A

Power conversion devices

51
Q

What electrical mode is active when the BATTERY switch is selected ON while the airplane is on the ground and there are no other power sources connected?
- On-Ground Battery Only mode
- Ground Handling mode
- Ground Service mode
- Battery mode

A

On-Ground Battery Only mode

52
Q

How can the flight crew determine circuit breaker status?
- Check the Status page display.
- Check the Electrical synoptic.
- Open CBs automatically display on EICAS.
- Check the CBIC display.

A

Check the CBIC display.

53
Q

What type of circuit breakers may be reset via the Circuit Breaker Indication and Control (CBIC) page?
- Thermal
- Electronic
- Mechanical
- Circuit breakers can not be reset via the CBIC

A

Electronic

54
Q

With the airplane unpowered on the ground, selecting the battery switch to ON, …
- initiates the left and right CCR start-up sequence.
- powers the left inboard and outboard displays.
- initiates the left CCR start-up sequence.
- powers the left TCP.

A

initiates the left CCR start-up sequence.

55
Q

You have just entered the flight deck and observe the BATTERY switch is OFF and both FWD EXT PWR AVAIL lights are illuminated. What electrical mode is active?
- Standby Power mode
- External Power ON mode
- On Ground Battery mode
- Ground Handling mode

A

Ground Handling mode

56
Q

You arrive to an aircraft that is in Ground Handling mode as displayed on the Electrical panel. In the interest of gaining access to some limited cabin systems and lighting, how can the aircraft be placed in Ground Service mode?
- Turning ON the GROUND SERVICE switch on the master attendant switch panel.
- Turning ON the battery switch.
- Selecting the GRD SERV MODE on the TCP.
- Plugging in an AFT external power cart.

A

Turning ON the GROUND SERVICE switch on the master attendant switch panel.

57
Q

In addition to the aforementioned cabin systems and lighting, energizing the Ground Service mode will also give you power to what else that will assist in your preflight?
- Left VHF -
- Right VHF -
- Flight deck dome lighting
- Service interphone

A

Flight deck dome lighting

58
Q

On the displayed panel, with engines running, you select the APU switch to Start and release it to ON. This…
- results in either the left or right starter being automatically selected.
- selects both starter/generators for APU start.
- causes the APU switch to stay in start until APU is at 65%.
- always selects the right starter/generator for APU start.

A

results in either the left or right starter being automatically selected.

59
Q

After applying forward external power to the aircraft, turning the APU switch to START and releasing it to ON you…
- allow the system to automatically select either starter/generator.
- have selected the right starter/generator for APU start.
- have selected the left starter/generator for APU start.
- have selected both starter/generators for APU start.

A

allow the system to automatically select either starter/generator.

60
Q

During an APU start with the BATTERY switch selected ON while the airplane is on the ground and no other power sources connected, the following are available:
- CCD L
- APU fire detection
- Engine fire detection
- All of the above

A

All of the above

61
Q

The displayed electrical synopic page indicates that….
- the left engine is powering the L1 and L2 busses.
- the right engine is being started.
- the APU is powering the R1 and R2 busses.
- All of the above are correct.

A

All of the above are correct.

62
Q

After a loss of all electrical power, the RAT deploys. In-AIR RAT Only mode (Standby Power) is indicated by…
- the display on the STATUS page.
- the Captain’’s outboard DU, inboard DU and the lower DU.
- nothing. Power indications are not displayed.
- the First Officer’’s outboard and inboard DUs.

A

the Captain’’s outboard DU, inboard DU and the lower DU.

63
Q

After a loss of all electrical power to captains and FOs flight instruments, and before RAT deployment, standby electrical power is supplied by…..
- the main battery.
- the permanent magnet alternators.
- no power available.
- the APU battery.

A

the main battery.

64
Q

After the RAT is deployed and supplying electrical power, which system is not powered?
- HUD
- IRU L ,R
- L VHF
- Center pitot heat

A

HUD

65
Q

After displaying the Circuit Breaker Indication and Control (CBIC) page, you notice the SPLY FAN FWD EQPT CLG L MC circuit breaker symbol shown. What does this symbol indicate? (Image shows open CB)
- Circuit is powered.
- ECB is tripped due to a fault.
- Circuit is not powered.
- ECB is open and collared for maintenance.

A

Circuit is not powered.

66
Q

If the APU shuts down automatically for an APU FIRE or you select the APU to OFF because of an EICAS [ ] APU LIMIT message,…
- it will first cool down for 2 minutes, then shut down.
- it will first will cool down for 5 minutes, then shut down.
- it will shut down immediately.
- it will shut down after the inlet door starts its closing sequence.

A

it will shut down immediately.

67
Q

You arrive at the gate to find the aircraft powered only by the APU (no external power or engine generator power). How many main 235 Vac buses are being powered?
- All 4 main Vac buses are powered.
- Only the R1 bus is energized by the right APU generator.
- Only the L1 bus is energized by the right APU generator.
- Only the L1 and R1 busses are powered by the left and right APU generator respectively.

A

All 4 main Vac buses are powered.

AA787 (20 decks)

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