ATA24 - Electrical

Question 1

1. AC ESS BUS is normally supplied by :
AC BUS 1
AC BUS 2
EMER-GEN
STATIC INVERTER

Answer 1

AC BUS 1

Question 2

The EXTERNAL POWER has priority over the APU GEN :
Yes
No

Answer 2

Yes

Question 3

3. The STATIC INVERTER transforms the DC power from Battery 1 into one KVA :
   Single-phase 115 V - 400 HZ AC power
   Three phase 115/200 V - 400 HZ AC power

Answer 3

Single-phase 115 V - 400 HZ AC power

Question 4

In flight, on batteries only, the AC ESS SHED and the DC ESS SHED buses are lost :
Yes
No

Answer 4

Yes

Question 5

5. In normal configuration, how is DC ESS BUS supplied ?
From TR 1
From ESS TR
From TR 2
From BAT 2

Answer 5

From TR 1

Question 6

6. The STATIC INVERTER works :
   All the time
   When A/C is in flight or on ground (speed < 50kt) and on batteries only
   When one MAIN GENERATOR fails

Answer 6

When A/C is in flight or on ground (speed < 50kt) and on batteries only

Question 7

7. Normal minimum battery voltage before APU start is :
22 V
25 V
27.5 V
No minimum

Answer 7

25 V

Question 8

8. In flight with BAT only, the AC ESS BUS is supplied by :
   STATIC INVERTER
   EMER GEN
   Both

Answer 8

STATIC INVERTER

Question 9

9. What happens when the GEN 1 LINE push button is set to OFF ?
   AC BUS 1 and 2 are not powered and emergency generator is automatically
   connected
   AC BUS 1 is powered by the GEN 2 because the GEN 1 is desactived
   AC BUS 1 is powered by the GEN 2 because the GEN 1 line contactor opens

Answer 9

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

Question 10

10. What does an “AVAIL” EXT PWR push button illumination in GREEN mean :
    The EXT PWR is plugged in and external power parameters are normal
    The A/C network is supplied

Answer 10

The EXT PWR is plugged in and external power parameters are normal

Question 11

. A Generator Control Unit (GCU) controls :
Voltage of the generator
Frequency of the generator
both answers are correct

Answer 11

both answers are correct

Question 12

12. In flight, in case of loss of all main generators, EMERGENCY GENERATOR not
running, the STATIC INVERTER supplies :
APU and ENG START + AC ESS BUS
ENG START + AC ESS BUS + AC ESS SHED BUS
ENG START

Answer 12

APU and ENG START + AC ESS BUS

Question 13

13. What happens during the EMER GEN TEST if AC NORMAL BUSES are supplied ?
    The RAM AIR TURBINE (RAT) is extended
    The EMER GEN is driven hydraulically if the BLUE ELECTRIC PUMP is running
    and the AC ESS BUS and the DC ESS BUS are connected to the emergency
    generator
    The GREEN system is pressurized and the emergency generator comes on line

Answer 13

The EMER GEN is driven hydraulically if the BLUE ELECTRIC PUMP is running
and the AC ESS BUS and the DC ESS BUS are connected to the emergency
generator

Question 14

. When disconnecting the IDG the button should be pressed :
For no more than 3 sec
For longer than 3 sec
Until fault light goes out

Answer 14

For no more than 3 sec

Question 15

What happens in case of total loss of main generators ?
The RAT is automatically extended and powers the YELLOW hydraulic system
which drives the EMER GEN
The RAT is automatically extended and powers the BLUE hydraulic system which
drives the EMER GEN
The RAT has to be manually extended and mechanically connected to the
emergency generator

Answer 15

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

Question 16

In flight, in case of loss of all main generators, emergency generator running, the DC
ESS BUS is supplied by the :
HOT BUS
ESS TR
Both answers are correct

Answer 16

ESS TR

Question 17

17. When is the DC BAT BUS supplied by the batteries ?
    APU starting
    Loss of AC BUS 1 + 2 (speed<100 kts)
    Both answers are correct

Answer 17

Both answers are correct

Question 18

18. In emergency configuration, AC ESS SHED BUS is automatically :
    SHED during RAT deployement
    Supplied by STATIC INVERTER when L/G is down

Answer 18

SHED during RAT deployement

Question 19

19. Can you reconnect the IDG in flight ?
    Yes
    No

Answer 19

No

Question 20

20. When operating, GEN 1 and GEN 2 have priority over APU GEN :
    Yes
    No

Answer 20

Yes

Question 21

21. On the EMER ELEC PWR panel, a FAULT light illuminates in red under the “RAT AND
    EMER GEN label”. What does it mean ?
    RAT is not extended
    Emergency generator is supplying but AC ESS BUS is not powered
    Emergency generator is not supplying power when AC BUS 1 and 2 are not
    powered

Answer 21

Emergency generator is not supplying power when AC BUS 1 and 2 are not
powered

Question 22

22. Generators are sometimes connected in parallel :
    Yes
    No

Answer 22

No

Question 23

23. When APU is available, if one generator fails, the failed generator is replaced by :
    The APU
    The other generator

Answer 23

The APU

Question 24

24. In cold aircraft configuration (No AC and no DC supply), where can the batteries
voltage can be checked ?
On the ECAM ELEC PAGE
On The ELEC OVERHEAD PANEL
There is no indication

Answer 24

On The ELEC OVERHEAD PANEL

Question 25

25. The ESS TR is used when a TR is faulty : Yes No

Answer 25

Yes

Question 26

26. DC BAT BUS can be supplied by : DC BUS 1 or batteries DC BUS 1, DC BUS 2 or batteries DC BUS 2 or batteries

Answer 26

DC BUS 1, DC BUS 2 or batteries

Question 27

27. AC BUS TIE CONTACTORS enable the electrical system : To be connested in parallel To be supplied by any generator or external power To be supplied by APU GEN or EXT PWR only

Answer 27

To be supplied by any generator or external power

Question 28

28. Only one generator is operating in flight : A part of the galley load is automatically shed Galley load must be manually shed All galleys are shed

Answer 28

A part of the galley load is automatically shed

Question 29

29. When GEN 1 or GEN 2 is selected to "OFF" position : The GEN is de-energized and line contactor opens The GEN is still energized and line contactor opens

Answer 29

The GEN is de-energized and line contactor opens

Question 30

30. On ground what happens with the RAT if the EMER ELEC PWR MAN ON is pressed ? The RAT is extended The emergency generator is actived Nothing

Answer 30

The RAT is extended

Question 31

31. On newer aircraft, if AC BUS 1 fails the AC ESS BUS is supplied by : EMER GEN AC BUS 2 STATIC INVERTER

Answer 31

AC BUS 2

Question 32

32. The BAT FAULT LIGHT illuminates amber when : BATTERY VOLTAGE is low BATTERY P/B switch is at OFF in flight Charging current increases outside limits

Answer 32

Charging current increases outside limits

Question 33

``` 33. In flight, in case of LOSS of all main genarators, emergency generator not running, the DC ESS BUS is supplied by : HOT BUS 2 ESS TR Both answers are correct ```

Answer 33

HOT BUS 2

Question 34

34. During preliminary cockpit preparation, to check BATTERY VOLTAGE, you must set the BAT P/B to : AUTO POSITION OFF POSITION

Answer 34

OFF POSITION

Question 35

35. In flight when the RAT is automatically extended : The BLUE HYDRAULIC SYSTEM is pressurized but the EMERGENCY GEN is not running The GREEN HYDRAULIC SYSTEM is pressurized and the EMERGENCY GEN runs The BLUE HYDRAULIC SYSTEM is pressurized and the EMERGENCY GEN runs

Answer 35

The BLUE HYDRAULIC SYSTEM is pressurized and the EMERGENCY GEN runs