Airbus A340 - Electrical Power

The main function of the MAINT BUS switch is:

To allow EXT PWR to supply AC and DC ESS buses and their respective shed buses.

To allow selected ground equipment to be powered without powering the entire electric system.

To power the AC and DC systems when the aircraft is on ground.

Correct! Wrong!

With APU GEN and external powers supplying the network:

APU supplies AC ESS only.

APU is supplying left side, external power A is supplying the right side.

APU supplies AC 1-1 and AC 1-2 only.

Correct! Wrong!

Two Electrical Contactor Management Units (ECMU) provide:

Control AC and DC contactors (except for TR contactors).

Control and monitoring AC and DC contactors (except TR which have their own control), galley shedding and no break power transfer.

Control of TR contactors.

Correct! Wrong!

The MAINT BUS switch is located:

On the FWD Circuit Breaker Panel behind the cockpit.

On the Purser's Control Panel in the FWD cabin.

On the overhead system panel in the cockpit.

Correct! Wrong!

The EMER GEN is powered by a hydraulic system pressurized by an engine driven hydraulic pump. Pressing the LAND RECOVERY p/b switch will:

Normally recover the AC and DC LAND RECOVERY BUSES and the components for approach and landing.

Operate when the gear is extended.

Supply the landing gear.

Correct! Wrong!

The APU battery:

Is dedicated to APU start only.

May be used for engine start when the APU is not available.

Can be used as a backup for BAT 1 or BAT 2.

Correct! Wrong!

According to this ECAM ELEC page:

BAT1 and BAT2 are faulty.

BAT1 and BAT2 are not connected to the DC network.

BAT1 and BAT2 are supplying the DC network and discharge current is 40 A.

Correct! Wrong!

As shown on this ECAM ELEC page, which BUS is normally supplying the ESS TR?

AC ESS BUS.

AC 1-1.

AC 2-4.

Correct! Wrong!

Loss of one generator or TR (except, if lost is due to over current detection) provides:

Loss of the corresponding AC or DC bus.

No effects on flight management.

APU generator required operational.

Correct! Wrong!

According to these indications which AC BUS supplies the ESS TR?

AC 1-2 BUS.

AC 1-1 BUS.

AC ESS.

Correct! Wrong!

When ECAM shows "ELEC ECMU 1 FAULT":

ECMU 1 controls GLC 1 and 2 and you should try to reset corresponding generators.

ECMU 1 controls Generator Line Contactors (GLC 3 and 4) and you should reset generator 3 and 4.

ECMU 1 controls GLC 1 and 2 and you should not reset corresponding generators.

Correct! Wrong!

According to this ECAM ELEC page:

APU GEN pb is set to Off.

APU GEN is failed.

APU is not running.

Correct! Wrong!

What is the meaning of this ECAM?

There is an ECMU fault.

There is a TR overload.

There is an engine generator fault.

Correct! Wrong!

The minimum number of generators required to supply the whole network is:

One engine generator and the EMER GEN.

One engine generator.

Two engine generators.

Correct! Wrong!

The Emergency generator is powered by:

The GREEN hydraulic system when pressurized by engine 1 or 4 driven hydraulic pump or by a Ram Air Turbine.

The Static Inverter.

A Ram Air Turbine (RAT).

Correct! Wrong!

What is the meaning of this ECAM?

Abnormal voltage.

Battery line contactor inoperative.

Charging current BAT1 increasing at abnormal rate.

Correct! Wrong!

One function of the Electrical Contactor Management Units (ECMU) is:

TR contactors monitoring.

Control of AC and DC bus ties, except TR contactor.

Automatic management of contactors.

Correct! Wrong!

In flight, APU not running, an engine generator has failed. What is supplying the corresponding AC BUS?

The other side outer engine generator.

Corresponding AC BUS is not powered. APU must be started to recover AC BUS.

The other generator on the same side as the failed generator.

Correct! Wrong!

What is the meaning of this ECAM?

BAT 2 is faulty.

TR 2 is faulty.

DC 2 BUS is not powered due to a short circuit.

Correct! Wrong!

The TR 2 is faulty, DC 2 BUS is powered by TR 1 through DC 1 and DC BAT BUS.

The TR 2 is faulty, then the DC 2 BUS is unpowered.

The TR 2 pb is set to OFF

Correct! Wrong!

Each engine generator supplies power to:

Its assigned AC BUS in normal operation.

The BUS on the opposite side in normal operation.

Only its assigned BUS in all cases.

Correct! Wrong!

This ECAM ELEC page shows:

GEN 4 pb is set to Off and engine 4 is not running.

GEN 4 pb is set to Off and engine 4 is running.

GEN 4 pb is set to On and engine 4 is running.

Correct! Wrong!

According to these indications:

EXT POWER is being plugged and available for use when started.

EXT POWER is plugged, but is not available.

EXT POWER is not plugged and APU GEN is connected.

Correct! Wrong!

An engine generator is driven:

By an Integrated Drive Generator (IDG).

At a ratio of 5 to engine speed.

Direct from the Accessory Gear Box (AGB).

Correct! Wrong!

According to this ECAM ELEC DC page:

The Static Inverter is being powered because TR 1 is not powered.

The BAT 2 is discharging at a rate of 4 A.

There is no degradation in the capability of DC system.

Correct! Wrong!

When the MAINT BUS switch is on:

The electric network supply is limited to Ground Service items.

It is for the purpose of operating the cargo door only.

Only the DC buses are powered.

Correct! Wrong!

On C/B ECAM page, the pilot reads "NORMAL". What does it mean?

There are no CB tripped or pulled.

No fault detected in Electronics Equipment Bay.

Electric supply to CB is normal.

Correct! Wrong!

During EMER GEN automatic start up sequence:

Red fault light on EMER ELEC PWR Panel will remain on until the EMER GEN reaches its normal output.

The MAN ON p/b must be pushed to extinguish red fault light on the EMER ELEC PWR Panel.

It is not recommended to push the MAN ON p/b to confirm EMER ELEC CONFIG on the EMER ELEC PWR Panel.

Correct! Wrong!

Airbus A340 - Electrical Power

Quiz

Airbus A340 - Electrical Power

The main function of the MAINT BUS switch is:

With APU GEN and external powers supplying the network:

Two Electrical Contactor Management Units (ECMU) provide:

The MAINT BUS switch is located:

The EMER GEN is powered by a hydraulic system pressurized by an engine driven hydraulic pump. Pressing the LAND RECOVERY p/b switch will:

The APU battery:

According to this ECAM ELEC page:

As shown on this ECAM ELEC page, which BUS is normally supplying the ESS TR?

Loss of one generator or TR (except, if lost is due to over current detection) provides:

According to these indications which AC BUS supplies the ESS TR?

When ECAM shows "ELEC ECMU 1 FAULT":

According to this ECAM ELEC page:

What is the meaning of this ECAM?

The minimum number of generators required to supply the whole network is:

The Emergency generator is powered by:

What is the meaning of this ECAM?

One function of the Electrical Contactor Management Units (ECMU) is:

In flight, APU not running, an engine generator has failed. What is supplying the corresponding AC BUS?

What is the meaning of this ECAM?

Each engine generator supplies power to:

This ECAM ELEC page shows:

According to these indications:

An engine generator is driven:

According to this ECAM ELEC DC page:

When the MAINT BUS switch is on:

On C/B ECAM page, the pilot reads "NORMAL". What does it mean?

During EMER GEN automatic start up sequence: