Electrical

Question 0

In normal operations, the electrical system is divided into _____ networks.

Answer 0

2

Question 1

Power to the DC system is supplied by:

Answer 1

4 Eng. driven DC Generators (28Vdc, 400A)
1 APU driven DC Starter/Generator (28Vdc, 400A)
2 NiCad Main Batteries, 24V 44ah
1 Lead Acid Backup Battery, 24v 5ah
1 GPU Connection 1600a rating

Question 2

Electrical system management and protection is performed by:

Answer 2

Electronic Distribution Logic (EDL)

Generator Control Units (GCU)

Question 3

The ______ has priority over al other power sources.

Answer 3

GPU

Question 4

Generators _____ and _____ supply the left electrical network

Answer 4

1

3

Question 5

Generators _____ and ______ supply the right electrical network.

Answer 5

2

4

Question 6

The APU is normally connected in parallel to generators _______ and ______.

Answer 6

2

4

Question 7

The APU generator can replace any inoperative _________ or may be used before engine starting.

Answer 7

Generator

Question 8

Both main batteries are _______ Vdc _______ amp hour NiCads

Answer 8

24

44

Question 9

The batteries cannot be recharged by the __________.

Answer 9

GPU

Question 10

The No. 1 battery is charged by the generators connected to _____ during normal flight operations

Answer 10

the left network

Question 11

The _____ battery provides electrical power for APU starting

Answer 11

2

Question 12

When on the ground with the batteries as the only electrical power source the ________ busses are deenergized.

Answer 12

Shed

Question 13

During APU starting, the _____ battery is isolated from the load busses.

Answer 13

1

Question 14

The batteries can provide ____ minutes of power in an electrical emergency.

Answer 14

40

Question 15

An electrical emergency is defined as:

Answer 15

a loss of all generators

Question 16

In an electrical emergency, EDL automatically configures the system dedicating the batteries to the ___________ and ________ busses only

Answer 16

essential

central

Question 17

If the automatic transfer fails, you can manually connect the batteries to the essential busses by pressing the __________ button

Answer 17

essential power

Question 18

On the ground, all DC busses can be energized if at least one of the following conditions is met:

Answer 18

GPU in use
1 Generator online & shed bus switch selected to OVRD
3 Generators online

Question 19

The _____ ________ bus is energized by connecting the GPU to the airplane with the batteries off and the GPC, BC1 and BC2 open

Answer 19

ground service

Question 20

A “BATT OVTEMP” warning message is presented on the EICAS when the associated battery temperature exceeds ______ ºC.

Answer 20

70

Question 21

A ____ Vdc, ___ Ah, sealed _____ _____ backup battery provides stabilized power for operation of the _______ protective function, even in case of a short circuit when system voltage may drop to near 0 volts.

Answer 21

24
5
lead acid
GCU

Question 22

For the backup battery to be charged the system must be energized through a power source other than external power and a ________ selector must be set to AUTO

Answer 22

battery

Question 23

The primary power source for the aircraft is the four 28 Vdc brushless ______ ______ _______.

Answer 23

Engine Driven Generators

Question 24

The aircraft generators will come online when engine speed reaches _________ N2

Answer 24

56.4%

Question 25

A "GEN 1(2,3,4) OVLD" caution message indicated that the associated generator is above _______ amps.

Answer 25

400

Question 26

If an over voltage is detected, the associated _______ isolates the generator from the DC bus.

Answer 26

GCU

Question 27

A generator reset attempt is allowed ______ time(s) after a failure.

Answer 27

1

Question 28

The APU and GPU are connected to the aircraft electrical system through the __________ DC bus which also provides ________ sharing in the event of generator failure or engine shutdown.

Answer 28

Central | Load

Question 29

The ______ starter generator can replace any engine dirven generator.

Answer 29

APU

Question 30

The APU generator supplies electrical power to the system at _____ % RPM plus ______ seconds

Answer 30

95 | 7

Question 31

If the airplane is on the ground, all DC busses will be kept energized for which of the following: ``` GPU on and connected: 4 Generators online: 3 Generators online: 2 Generators online: 1 Generator online: At least 1 Generator online with Shed Bus set to "OVRD": ```

Answer 31

``` Yes Yes Yes No No Yes ```

Question 32

If the airplane is in the air, all DC busses will be kept energized if at least ______ generators are online.

Answer 32

3

Question 33

All generator currents and voltage can be monitored on the ______ page of the _______.

Answer 33

Electric | MFD

Question 34

The following lights are powered by the Ground Service Bus: _________ __________ _________ __________ _________ __________

Answer 34

Pax Cabin Lights Lav Lights Galley Lights Courtesy/Stair Lights Cockpit Dome Lights Baggage/Service Compartment Lights

Question 35

The AC system is powered by ____ 250Vac single phase static _______ (NA after Legacy s/n 863)

Answer 35

1 | inverter

Question 36

Avionics Master push buttons allow disconnection of some navigation and communication equipment from the load busses while starting the ______ on the ground.

Answer 36

APU

Question 37

The maximum load on the engine generator is ______ amps.

Answer 37

400

Question 38

The maximum load on the APU starter-generator up to 30,000 ft is _________ amps. The maximum load above 30,000 ft is _____ amps.

Answer 38

400 | 300

Question 39

The minimum battery temperature for APU start is ______ ºC.

Answer 39

-20

Question 40

The minimum battery voltage for APU start is ______ volts.

Answer 40

23.5

Question 41

If the battery voltage drops below _____ volts, the battery must be physically removed from the aircraft by maintenance for recharging.

Answer 41

19

Question 42

List the items on Hot Bus 1: __________ _________ __________ _________ __________

Answer 42

ELT Engine Fire Bottle A Fuel Shutoff Valve Eng. 1 Hyd. Shutoff valve eng. 1 Fuel pressure refueling

Question 43

``` List the items on the Hot Bus 2 _______________ _____________ _______________ _____________ _______________ _____________ _______________ ```

Answer 43

Courtesy/Stair lights Auto pos. Eng. Fire Bottle B Fuel Shutoff valve Eng. 2 Hyd. Shutoff valve eng. 2 Main Door Control Fus fuel isolation valve Fus fuel vent valve

Question 44

The _________ override switch closes the relay provided the airplane in on the _________ with at least _____ generator(s) operative.

Answer 44

Shed bus Ground 1

Question 45

An illuminated strip in the button on the overhead panel means the switch in not in the normal _______ position.

Answer 45

flight