ELEC

Question 1

in normal electrical configuration, the DC ESS bus is supplied

Accepted Answer

From ESS TR

Answer

From TR 1

Answer

From TR 2

Answer

From BAT 2

Question 2

What happens in case of dual engine failure resulting in the loss of both main generators?

Accepted Answer

The RAT is automatically extended and powers the green system which drives the EMER GEN

Answer

The RAT is automatically extended and powers the yellow system which drives the EMER GEN

Answer

The RAT must be manually extended

Answer

The RAT does not extend automatically

Question 3

The AC ESS BUS is normally supplied by

Accepted Answer

AC BUS 1

Answer

AC BUS 2

Answer

EMER GEN

Answer

Static inverter

Question 4

The DC BAT BUS can be supplied by

Accepted Answer

DC BUS 1, DC BUS 2 or batteries

Answer

DC BUS 1 or batteries

Answer

DC BUS 2 or batteries

Answer

DC BUS 1 only

Question 5

AC BUS tie contactors enable the electrical system

Accepted Answer

To be supplied by any generator or external power

Answer

To be connected in parallel

Answer

To be supplied by APU GEN or external power only

Answer

To be tied to external DC power

Question 6

What happens during the EMER GEN test?

Accepted Answer

If the green system is pressurised the EMER GEN runs and supplies DC & AC ESS BUS

Answer

The RAT is extended

Answer

If the blue system is pressurised the EMER GEN comes on line

Answer

The EMER GEN comes on line and the yellow system is pressurised

Question 7

For the aircraft batteries

Accepted Answer

Normal minimum voltage is 25.5V

Answer

Normal minimum voltage is 22V

Answer

Normal minimum voltage is 27.5V

Answer

No minimum voltage is specified

Question 8

When disconnecting the IDG the button should be pressed

Accepted Answer

For no more than 3 seconds

Answer

For longer than 3 seconds

Answer

Until the FAULT light goes out

Answer

For no more than 5 seconds

Question 9

On the EMER ELEC PWR panel, the EMER GEN FAULT light illuminated red in flight means

Accepted Answer

The EMER GEN is not supplying power and normal AC supply is lost in flight

Answer

The RAT is not extended

Answer

The EMER GEN is not supplying when AC BUS 1 and 2 are not powered or the DC BAT

Answer

The EMER GEN is supplying but AC ESS BUS is not powered

Question 10

What happens when the GEN 1 pushbutton is set to OFF?

Accepted Answer

AC BUS 1 is powered by GEN 2 because the GEN 1 line contactor is opened

Answer

AC BUS 1 and 2 are not powered and the EMER GEN is automatically connected

Answer

AC BUS 1 is powered by GEN 2 because IDG 1 is disconnected

Answer

AC BUS 1 is not powered because the GEN 1 line contactor is opened and the transfer contactor is not closed

Question 11

With no AC or DC power supplied to the aircraft, can the battery voltage be checked?

Accepted Answer

Yes, on the overhead ELEC panel

Answer

Yes, on the ECAM EL/DC page

Answer

No, there is no indication

Answer

Yes, on the MCDU DATA page

Question 12

TR 1 is normally supplied by

Accepted Answer

AC BUS 1

Answer

DC BUS 1 and DC BAT BUS

Answer

The static inverter

Answer

The EMER GEN

Question 13

In flight on batteries only, are the AC ESS SHED bus and DC ESS SHED bus lost?

Accepted Answer

Yes

Answer

No

Answer

Only the AC ESS SHED bus is lost

Answer

Only the DC ESS SHED bus is lost

Question 14

The static inverter works

Accepted Answer

When the aircraft is in flight and on battery power only

Answer

Always

Answer

When one main generator fails

Answer

Only when GEN 2 fails

Question 15

When the EMER GEN, driven by the green hydraulic system, is providing the aircraft’s electrical power

Accepted Answer

More systems are available when green hydraulics are pressurised by an engine-driven pump than by the RAT

Answer

The available systems are independent of the green hydraulic pressure source

Answer

More systems are available when green hydraulics are pressurised by the RAT than by an engine-driven pump

Answer

The crew should switch the green ELEC pump ON to increase green system pressure

Question 16

The static inverter transforms DC power from the ESS DC BUS into

Accepted Answer

Single phase 115V, 400Hz AC

Answer

Three phase 115/200V, 400Hz AC

Answer

28V DC

Answer

25.5V DC

Question 17

In flight, in case of loss of all main generators, EMER GEN not running, the static inverter supplies

Accepted Answer

AC ESS BUS & AC LAND REC

Answer

APU and Engine start and AC ESS BUS

Answer

Engine start

Answer

HOT BUS 1

Question 18

External power A has priority over the APU GEN when both are connected

Accepted Answer

True for AC BUS 2

Answer

True

Answer

False

Answer

True for AC BUS 1

Question 19

GEN 1 and GEN 2 when operating have priority over the APU GEN

Accepted Answer

True

Answer

False

Answer

Only true in flight

Answer

Only true on the ground

Question 20

With the APU GEN available, if one main generator fails, the failed generator is replaced by

Accepted Answer

The APU GEN

Answer

The other computer

Answer

The remaining main generator (bus tie takes place to allow supply to both channels

Answer

The RAT

Question 21

If TR1 or 2 fails

Accepted Answer

The other TR automatically replaces the faulty one, and the ESS TR supplies DC ESS BUS

Answer

The static inverter replaces the faulty TR

Answer

The DC bus on the faulty side is lost

Answer

The EMER GEN supplies DC power on the faulty side

Question 22

In flight with loss of all main generators, EMER GEN not running, the DC ESS BUS is supplied by

Accepted Answer

BAT 1 and BAT 2

Answer

BAT 2

Answer

ESS TR

Answer

BAT 1

Question 23

In flight with loss of all main generators, EMER GEN running, the DC ESS BUS is supplied by

Accepted Answer

The ESS TR

Answer

HOT BUS 1

Answer

Both HOT BUS 1 and the ESS TR

Answer

The DC BAT BUS

Question 24

For each generator, the GCU controls

Accepted Answer

Voltage, frequency and the associated GLC (generator line contactor)

Answer

Voltage

Answer

Frequency

Answer

GLC (generator line contactor)

Question 25

Generators may be connected in parallel

Accepted Answer

Only on ground during NBPT

Answer

Never

Answer

Only in EMER ELEC CONFIG

Answer

Only in flight

Question 26

If AC BUS 1 fails, the AC ESS BUS is supplied by

Accepted Answer

AC BUS 2

Answer

The EMER GEN

Answer

The static inverter

Answer

The RAT

Question 27

In case of flight with batteries only, the AC ESS BUS is supplied by

Accepted Answer

The static inverter

Answer

The EMER GEN

Answer

Both the static inverter and the EMER GEN

Answer

TR1

Question 28

In EMER ELEC CONFIG, when the EMER GEN is supplied by engine driven pumps, the AC ESS SHED 
bus is automatically

Accepted Answer

Supplied by the EMER GEN

Answer

Shed with landing gear down

Answer

Shed when in emergency configuration

Answer

Fed from AC BUS 1

Question 29

With only one main generator operating in flight

Accepted Answer

Part of the galley load is automatically shed

Answer

The main galley load is automatically shed

Answer

All galleys are shed

Answer

Galleys are not shed

Question 30

Can you reconnect an IDG in flight?

Accepted Answer

No (only maintenance personnel can reconnect it on ground)

Answer

Yes

Answer

Yes, IDG 1 only

Answer

Yes, IDG 2 only

Question 31

When GEN 1 or GEN 2 is selected OFF

Accepted Answer

The generator field is de-energised and the line contactor is open

Answer

The generator is still energised and the line contactor is open

Answer

The selection has no effect in flight

Answer

It can only be reset on the ground

Question 32

When the EXT PWR pushbutton AVAIL light is illuminated green

Accepted Answer

External power is connected to the aircraft, and its parameters are normal

Answer

The AC network is supplied

Answer

Ground services are supplied

Answer

The DC network is supplied

Question 33

When are the batteries supplying the DC BAT BUS?

Accepted Answer

On ground, battery power only, speed < 50 kt, battery switches AUTO

Answer

During APU starting

Answer

On ground, battery power only, speed > 50 kt

Answer

Both during APU starting and on ground, battery power only, speed < 50 kt, battery switches AUTO

Question 34

During cockpit preparation, to check a battery’s voltage you must set the respective BAT pushbutton to

Accepted Answer

OFF

Answer

AUTO

Answer

NORM

Answer

ON

Question 35

The BAT FAULT light illuminates when

Accepted Answer

Charging current is outside limits

Answer

The battery voltage is below 25.5V

Answer

Charging current is low

Question 36

During flight on battery power only, the static inverter is supplied by

Accepted Answer

The DC ESS BUS

Answer

HOT BUS 1 and HOT BUS 2

Answer

HOT BUS 1

Answer

The DC BAT BUS

ELEC

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