ELECTRICAL SYSTEM

Question 1

1. In normal configuration, How is DC ESS BUS supplied?
   a. from TR1
   b. from ESS TR
   c. from TR 2
   d. from Bat 2

Answer 1

a. from TR1

Question 2

2. What happens in case of total loss of main generators?
   a. the RAT is automatically extended and powers the yellow system which drives the emergency generator
   b. the RAT is automatically extended and powers the blue system which drives the emergency generators
   c. the RAT has to be manually extended
   d. the RAT extended and mechanically connected to the emergency generator

Answer 2

b. the RAT is automatically extended and powers the blue system which drives the emergency generators

Question 3

3. AC ESS Bus is normally supplied by?
   a. AC BUS 1
   b. AC BUS 2
   c. Emergency Generator
   d. Static Inverter

Answer 3

a. AC BUS 1

Question 4

4. DC BAT BUS can be supplied by:
   a. DC bus 1 or batteries
   b. DC bus 1, DC bus 2 or batteries
   c. DC bus 2 or batteries

Answer 4

b. DC bus 1, DC bus 2 or batteries

Question 5

5. AC BUS TIE contactors enable the electrical system:
   a. to be connected in a parallel
   b. to be supplied by any generator or external power
   c. to be supplied by APU GEN or EXT PWR only

Answer 5

b. to be supplied by any generator or external power

Question 6

6. What happens during the EMER GEN test?
   a. the ram air turbine (RAT) is extended
   b. if the blue system is pressurized, the emergency generator comes on line
   c. the green system is pressurized and the emergency generator comes on line supplied by hot bus 2

Answer 6

b. if the blue system is pressurized, the emergency generator comes on line

Question 7

7. Normal minimum battery voltage before APU start is:
   a. 22 V
   b. 25.5 V
   c. 27.5 V
   d. no minimum

Answer 7

b. 25.5 V

Question 8

8. When disconnecting the IDG, the button should be pressed:
   a. for no more than 3 secs.
   b. for longer than 3 secs.
   c. until fault light goes out
   d. for no more than 5 secs.

Answer 8

a. for no more than 3 secs.

Question 9

9. On the EMER ELEC PWR panel, a red FAULT light illuminates under the “RAT and EMER GEN” label. What does it mean?
   a. RAT is not extended
   b. emergency generator is not supplying when AC bus 1 and 2 are not powered (above 100 kts) or DC bat bus is not powered
   c. emergency generator is supplying but AC ESS bus is not powered
   d. emergency generator is not supplying when AC bus 1 and 2 are not powered

Answer 9

d. emergency generator is not supplying when AC bus 1 and 2 are not powered

Question 10

10. What happens when the GEN 1 LINE pb is set to OFF?
    a. AC BUS 1 and 2 are not powered and emergency generator is automatically connected
    b. AC BUS 1 is powered by the GEN 2 because the GEN 1 is deactivated
    c. AC BUS 1 is powered by the GEN 2 because the GEN 1 line contactor is opened
    d. AC BUS 1 is not powered because the GEN 1 line contactor is opened and transfer contactor is not closed.

Answer 10

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

Question 11

11. In cold aircraft configuration (no AC and no DC supply), where the batteries voltage can be checked?
    a. on the ECAM ELEC page
    b. on the ELEC overhead panel
    c. there is no indication

Answer 11

b. on the ELEC overhead panel

Question 12

12. AC ESS BUS is normally supplied by:
    a. AC BUS 1
    b. AC BUS 2
    c. Static inventer

Answer 12

a. AC BUS 1

Question 13

13. IN flight, On Batteries Only, the AC ESS SHED BUS and the DC ESS SHED BUS are lost:
    a. yes
    b. no

Answer 13

a. yes

Question 14

14. The static inventer works:
    a. always
    b. when A/C is in flight and on batteries only
    c. when one main generators fails

Answer 14

b. when A/C is in flight and on batteries only

Question 15

15. On ground, what happens when the “RAT and EMER GEN MAN ON P/B” is pressed in:
    a. the RAT is extended
    b. the emergency generator is activated

c . nothing

Answer 15

a. the RAT is extended

Question 16

16. The static inverter transforms the DC voltage from the battery bus into:
    a. single phase 115 V – 400 HZ AC current
    b. three phase 115/200 V – 400 HZ AC current

Answer 16

a. single phase 115 V – 400 HZ AC current

Question 17

17. In flight, in case of loss of all main generators, emergency generator not running, the static inverter supplies:
    a. APU and ENG start + AC ESS bus
    b. ENG start + AC ESS + AC ESS shed bus
    c. ENG start

Answer 17

a. APU and ENG start + AC ESS bus

Question 18

18. The external power has priority over the APU GEN:
    a. yes
    b. no

Answer 18

a. yes

Question 19

19. GEN 1 and GEN 2, when operating, have priority over APU GEN:
    a. yes
    b. no

Answer 19

a. yes

Question 20

20. With APU available, if one generator fails, the failed generator is replaced by:
    a. the APU
    b. the other GENERATOR

Answer 20

a. the APU

Question 21

21. The ESS TR may be used to replace a faulty TR:
    a. yes
    b. no

Answer 21

a. yes

Question 22

22. In flight, in case of loss of all generators, Emergency generator not running, the DC ESS bus is supplied by:
    a. BAT 2
    b. ESS TR
    c. both

Answer 22

a. BAT 2

Question 23

23. In flight, in case of loss of all main generators, emergency generator running, the DC ESS BUS is supplied by:
    a. Hot bus
    b. ESS TR
    c. Both

Answer 23

b. ESS TR

Question 24

24. The IDG regulates the generator:
    a. speed
    b. voltage
    c. frequency

Answer 24

a. speed

Question 25

26. If AC bus 1 fails the AC ESS BUS is supplied by the: a. EMER GEN b. AC bus 2 c. static inverter

Answer 25

b. AC bus 2

Question 26

27. In case of total electrical loss the AC ESS BUS is supplied by: a. static inverter b. EMER GEN c. both

Answer 26

a. static inverter

Question 27

28. In emergency configuration, AC ESS SHED BUS is automatically: a. shed if the RAT stalls b. supplied by static inverter when L/G is down

Answer 27

a. shed if the RAT stalls

Question 28

29. Only one generator is operating in flight: a. main galley is automatically shed b. secondary galley is automatically shed c. all galleys are shed

Answer 28

a. main galley is automatically shed

Question 29

30. Can you reconnect the IDG in flight? a. yes b. no

Answer 29

b. no

Question 30

31. When GEN 1 or GEN 2 is selected off: a. the GEN is deenergized and line contactor is open b. the GEN is still energized and line contactor is open

Answer 30

a. the GEN is deenergized and line contactor is open

Question 31

32. When the EXT PWR pb green AVAIL lite is illuminated, this means that: a. the EXT PWR is connected to the A/C b. the A/C network is supplied

Answer 31

a. the EXT PWR is connected to the A/C

Question 32

33. When are the batteries supplying the DC BAT BUS: a. APU starting b. loss of AC bus 1 c. loss of AC bus 1+2 (speed < 100 kts) d. a + c

Answer 32

d. a + c

Question 33

34. When you want to check battery voltage, you must set the BAT pb to: a. auto position b. off position

Answer 33

b. off position

Question 34

35. The battery FAULT light illuminates when: a. battery voltage < 25V b. battery pb set at OFF in flight c. charging current increases at an abnormal rate

Answer 34

c. charging current increases at an abnormal rate

Question 35

36. In certain cases, the static inverter is supplied by: a. BAT 1 and BAT 2 b. BAT 1 c. DC BAT BUS

Answer 35

b. BAT 1

Question 36

37. BUS TIE contactors when closed enable AC BUS 1 and 2: a. to be supplied by anyone of the main generators or external power b. to be supplied by APU generator or external power only c. to be connected in prallel

Answer 36

a. to be supplied by anyone of the main generators or external power

Question 37

38. In case of the TR (1 or 2) failure, does the ESS TR supply the DC ESS BUS: a. yes b. no

Answer 37

a. yes

Question 38

39. The green EXT PWR pb AVAIL light is ON what does it mean? a. the EXT power is plugged in, and parameters are normal b. the A/C network is supplied

Answer 38

a. the EXT power is plugged in, and parameters are normal