Electrical Flashcards

1
Q

Electrical faults are automatically detected and ____ isolated.

A

Automatically ()

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2
Q

The main electrical power sources are:

A

4 IDGs, 2 APU Gen, 2 Ext Power

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3
Q

The ground service bus is powered whenever the ____bus is powered.

A

AC Bus 1 ()

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4
Q

The First Officer transfer bus is powered by_____.

A

AC Bus 2 or AC bus 1 () FCOM 6.20.4

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5
Q

During automatic ILS approaches AC and DC busses #1, #2, #3 remain connected to the synchronous bus for redundancy electrical backup to autopilots. True or False.

A

FALSE ()

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6
Q

Standby selector power selector switch in BAT will provide approximately ____minutes of emergency power

A

30 min ()

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7
Q

If AC bus 1 is unpowered (all engines operating) which of the following will be observed?

A

ELEC AC BUS 1 ()

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8
Q

When is the EICAS advisory message DRIVE DISC displayed?

A

IDG disconnect ()

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9
Q

AC bus 1, 2 and 3 isolation lights and EICAS advisory message ELEC BUS ISLN may be displayed during autoland. True or False.

A

False. ( AC BUS ISOL light1,2,3 remain extinguished. The EICAS msg ELEC BUS ISOL is not displayed. The msg “ELECTRICAL SYNOPTIC INHIBITED FOR AUTOLAND” is displayed on the electrical synoptic)

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10
Q

The ground handling bus supplies power to:

A
  1. cargo handling equipment and compartment light 2. fueling system 3.Aux hyd. pump #4
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11
Q

When the EICAS advisory message ELEC BUS ISLN is displayed:

A

BUS tie breaker open (BTB), effective bus is disconnected from synchronous bus,ISLN displayed on synoptic

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12
Q

The EICAS advisory message BATTERY OFF is displayed when the main battery is discharging.True or False.

A

False. It is displayed when battery switch is OFF ()

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13
Q

When is the EICAS advisory message BAT DISCH APU displayed?

A

APU battery discharging or during Standby power test ()

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14
Q

With both APU generators connected; after the #4 engine has been started, the respective IDG automatically powers its side of the synchronous bus.True or False.

A

TRUE ()

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15
Q

What occurs if available generator power is less than electrical system demand?

A

Load shedding. No EICAS msg or lights ()

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16
Q

When autoland is engaged, system logic provides independent power sources for each of the three autopilots. which statement is true?

A

AC & DC isolated,AC bus 4 continues to power the synchronous bus ()

17
Q

What does placing the bus tie switch in the auto position do?

A

pushing the Bus tie switch to AUTO, closes the related BTB and DCIR and elables automatic AC BTB (bus tie breaker) operation

18
Q

What does the EICAS message ELEC GEN OFF 3 mean?

A

Generator control breaker open and AC bus 3 will be unpowered

19
Q

During preflight, selecting AUTO on the standby power selector, with the battery switch on, activates the primary EICAS display and enables required caution & warning? True or False.

A

TRUE (FCOM 6.20.7)

20
Q

THE FOUR MAIN DC BUSSES REMAIN INTERCONNECTED THROUGH THE DC ISOLATION RELAYS AND DC TIE BUS IF THERE IS AN AC BUS OR TRASFORMER/RECTIFIER (T/R) FAILURE. True or False.

A

TRUE ()

21
Q

THE CAPTAIN’S TRANSFER BUS IS NORMALLY POWERED BY

A

AC BUS 3

22
Q

PUSHING A BUS TIE SW. OFF OPENS THE RESPECTIVE DC ISOLATION RELAY. THE ASSOCIATED DC BUS REMAINS POWERED BY ITS RESPECTIVE AC BUS AND TR. True or False.

A

TRUE ()

23
Q

IF AC BUS 1 IS UNPOWERED (ALL ENGINES OPERATING) WHICH OF THE FOLLOWING WILL BE OBSERVED?

A

ELEC AC BUS 1

24
Q

WHICH AC BUS SERVES AS THE PRIMARY BACKUP POWER SOURCE FOR THE CAPTAIN’S AND FIRST OFFICER’S TRANSFER BUSSES?

A

AC BUS 1 (FCOM 6.20.5)

25
Q

THE GROUND HANDLING BUS SUPPLIES POWER TO

A

cargo handling equipment and compartment light, fueling system, aux hyd. pump 4 ()

26
Q

WITH THE STANDBY POWER SELECTOR IN THE BAT POSITION AND THE BATTERY SWITCH ON, WHAT IS THE ELECTRICAL SYSTEM CONFIGURATION?

A

Main bat supplies Stby bat via the main hot bat. bus, main stby inverter and apu charges are disabled