4. Electrical System

Question 1

In normal electrical configuration, how is DC ESS bus supplied

Accepted Answer

From TR 1 via DC bus 1 and DC Bat Bus

Answer

From ESS TR

Answer

From TR 2

Answer

From Batt 2.

Question 2

What happens in case of total loss of main generators

Accepted Answer

The Rat is automatically extended and powers the blue system which drives the emergency generator.

Answer

The Rat is automatically extended and powers the yellow system which drives the emergency generator.

Answer

The Rat has to be manually extended

Answer

The Rat is extended and mechanically connected to the emergency generator.

Question 3

the electrical power system consists of

Accepted Answer

A three phase 115/200 volt 400 hertz constant frequency AC system and a 28 DC system

Answer

A three phase 180/220 volt 400 hertz constant frequency system and a 28 volt DC system

Answer

A three phase 115/220 volt 400 hertz constant frequency system and a 28 volt DC system

Answer

A three phase 115/200 volt 400 hertz constant frequency DC system and a 28 volt AC system

Question 4

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 emergency gen. test

Accepted Answer

The blue system is pressurised and the emergency generator comes on line

Answer

The ram air turbine is extended

Answer

The green system is pressurised and the emergency generator comes on line, supplied by hot bus 2.

Answer

The emergency generator comes on line and the yellow system is pressurised.

Question 7

Normal minimum battery voltage before apu start is

Accepted Answer

25.5v

Answer

22v.

Answer

27.5v

Answer

Minimum

Question 8

When disconnecting the IDG the button should be pressed

Accepted Answer

For no more than 3 secs

Answer

For longer than 3 secs

Answer

Until the fault light goes out

Answer

For no more than 5secs.

Question 9

On the emergency electrical power panel, a fault light illuminates under the ‘ RAT and Emer.Gen.’ label. What does it mean

Accepted Answer

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

Answer

Rat is not extended

Answer

Emergency generator is not supplying when AC bus 1 and 2 are not powered or Dc Bat bus is not powered

Answer

Emergency generator is supplying but AC Ess bus is not powered

Question 10

What happens when the Gen 1 line Pb. is set to off

Accepted Answer

AC Bus 1 is powered by the gen.2 because the gen.1 line contactor is opened

Answer

AC Bus one and 2 are not powered and emergency generator is automatically connected

Answer

AC Bus 1 is powered by the gen. 2 because the gen 1 is deactivated

Answer

AC Bus 1 is not powered because the gen. 1 line contactor is opened and transfer contactor is not closed

Question 11

Where can the battery voltage be checked

Accepted Answer

On the elec overhead panel and the ECAM elec page

Answer

On the ECAM elec page only

Answer

On the elec overhead panel and the ECAM E/WD

Answer

On the elec overhead panel only

Question 12

AC essential bus is normally supplied by

Accepted Answer

AC Bus 1

Answer

AC Bus 2

Answer

Static inverter

Answer

Emer. gen

Question 13

In flight on batteries only, the AC Ess Shed bus and DC Ess Shed bus are lost

Accepted Answer

Yes

Answer

No

Answer

Only A/C Ess Shed Bus is lost

Answer

Only D/C Ess Shed Bus is lost

Question 14

The static inverter works

Accepted Answer

When A/C speed is > 50kts and on batteries only

Answer

Always

Answer

When one main generator fails

Answer

Only when gen. 2 fails

Question 15

On ground what happens if the RAT and Emer. Gen. Man On Pb. Is pressed

Accepted Answer

The Rat is extended

Answer

The emergency generator is activated

Answer

Nothing

Answer

The blue hydraulic system is pressurised and this causes the RAT to extend and rotate.

Question 16

The static inverter transforms the DC voltage from the battery bus into

Accepted Answer

Single phase 115v - 400 Hz. A/C current

Answer

Three phase 115/200v - 400hz. A/C current

Answer

28v D/C current

Answer

25.5v D/C current.

Question 17

In flight in case of loss of all main generators, emergency generator not yet running (batteries only), the static inverter supplies

Accepted Answer

A/C Ess bus and Engine Ignition A

Answer

Eng Ignition & A/C Ess Bus & A/C Ess Shed Bus

Answer

Eng Ignition Only

Answer

Hot bus 1

Question 18

The external power has priority over the Apu. gen.

Accepted Answer

Yes

Answer

No

Answer

Only in flight

Answer

No, Apu. gen. has priority over external power always

Question 19

Gen 1 and Gen 2 when operating have priority over the Apu gen

Accepted Answer

Yes

Answer

No

Answer

Only in flight

Answer

Only on the ground

Question 20

With Apu gen. available, if one main generator fails, the failed generator is replaced by

Accepted Answer

The APU

Answer

The other computer

Answer

Bus tie takes place and the remaining main generator supplies both channels

Answer

The RAT

Question 21

If a TR fails

Accepted Answer

The other TR automatically replaces the faulty one & the Ess TR supplies the DC Ess Bus

Answer

The Static inverter replaces the faulty TR

Answer

The DC Bus on the faulty side is lost

Answer

The Emergency generator supplies DC power on the faulty side

Question 22

In flight in case of loss of all main generators, emergency generator not running, the DC Ess Bus is supplied by

Accepted Answer

Hot bus 2

Answer

Ess TR

Answer

Both

Answer

Hot bus 1

Question 23

In flight in case of loss of all main generators, emergency generator running , the DC Ess Bus is supplied by the

Accepted Answer

ESS TR

Answer

Hot bus

Answer

Both

Answer

DC Bat bus

Question 24

The IDG regulates the ........ of the generator

Accepted Answer

Speed

Answer

Voltage

Answer

Frequency

Answer

GLC (generator line contactor)

Question 25

When switched to ALTN the AC Ess Feed p/b causes the AC Ess Bus to be

Accepted Answer

Supplied from AC bus 2

Answer

Supplied from AC bus 1

Answer

Supplied from DC bus 1

Answer

Supplied from DC bus 2

Question 26

If AC bus 1 fails the AC Ess bus is supplied by

Accepted Answer

AC Bus 2

Answer

Emer Gen

Answer

Static inverter

Answer

The RAT

Question 27

In case of total electrical loss the AC Ess bus is supplied by

Accepted Answer

Static inverter

Answer

Emer Gen

Answer

Both

Answer

TR 1

Question 28

In Emergency configuration, AC Ess shed bus is automatically shed

Accepted Answer

If the RAT stalls or aircraft is on ground with speed<100kts

Answer

When the landing gear is down

Answer

When in emergency configuration

Answer

When AC Bus 1 is lost

Question 29

If one main generator fails in flight (and the APU generator is not being used)

Accepted Answer

Part of the galley load is automatically shed

Answer

All galley load is automatically shed once the APU generator becomes available.

Answer

All galleys are shed

Answer

All galleys are not shed

Question 30

Can you reconnect the IDG in flight

Accepted Answer

No

Answer

Yes

Answer

No. 1 idg only

Answer

No. 2 idg only.

Question 31

When Gen. 1 or Gen. 2 is selected to off

Accepted Answer

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

Answer

The Generator is still energised and line contactor is open

Answer

Cannot select off in flight

Answer

Can only be reset on ground.

Question 32

When the EXT Pwr Pb green avail is illuminated

Accepted Answer

The external power is connected to the a/c

Answer

The A/C network is supplied

Answer

Ground services are supplied

Answer

D/C network supplied

Question 33

Emergency generation, the D/C bat bus is automatically connected to the batteries

Accepted Answer

below 100 kts

Answer

below ‘s’ speed

Answer

below green dot speed

Answer

below 50kts

Question 34

When you want to check battery voltage, you must set the Bat Pb to

Accepted Answer

Off position

Answer

Auto position

Answer

Norm position

Answer

On position

Question 35

The Bat fault light illuminates when

Accepted Answer

Charging current increases at an abnormal rate

Answer

Battery voltage < 25v

Answer

Battery Pb switch is at off in flight

Answer

Charging current is low

Question 36

In certain cases the static inverter is supplied by

Accepted Answer

Hot bus 1

Answer

Hot bus 1 and Hot bus 2

Answer

D/C Bat bus

Answer

A/C Ess bus

4. Electrical System

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