B777 Electrical

Boeing 777 Electrics

Boeing 777 Electrics

1 / 15

What is the correct electrical panel configuration for normal flight?

BUS TIE switches in AUTO, BATTERY switch ON, GENERATOR CONTROL switches ON.

BUS TIE switches in AUTO, BATTERY switch OFF, GENERATOR CONTROL switches ON.

BUS TIE switches in ISLN, BATTERY switch ON, GENERATOR CONTROL switches ON

BUS TIE switches in AUTO, BATTERY switch ON, GENERATOR CONTROL switches OFF.

2 / 15

On ground no power connected to the airplane. Which items will be powered if you push the BATTERY switch ON?

Only the main battery bus will be powered.

All statements are correct.

The APU controller and the DC fuel pump will be powered.

The hot battery bus will be powered.

3 / 15

The standby inverter converts DC power to AC power. The inverter powers the AC standby bus if the right transfer bus is not powered.

False.

True.

The standby inverter converts DC power to AC power. The inverter powers the AC standby bus if the left transfer bus is not powered.

4 / 15

Which one of the following is not a reason for the backup electrical system to automatically power one or both transfer busses?

Approach (APP) mode is selected for autoland.

Power to one or both of the main AC busses is lost.

Only one main AC generator (includes APU) is available.

One engine shutdown.

5 / 15

Which one of the following is not true about the APU generator?

The APU generator cannot power both main busses at the same time.

The APU generator is electrically identical to the IDG generators.

In flight, when both transfer busses are unpowered, the APU starts automatically, regardless of APU selector position.

If no other power source is available when the APU generator becomes available, the APU generator automatically connects to both main AC busses.

6 / 15

Which of the following is not a main AC electrical power source?

Primary and secondary external power.

Transformer Rectifier Units (TRUs).

Left and right engine integrated drive generators (IDGs).

APU generator.

7 / 15

Bus tie relays, controlled by BUS TIE switches, isolate or parallel the right and left main busses. When both BUS TIE switches are set to AUTO, the bus tie system operates automatically to maintain power to both main busses.

True.

False.

8 / 15

What provides DC power on the B777?

Transfer busses.

Standby inverters.

Transformer rectifier units.

DC generators.

9 / 15

Which one of the following is not true about the ram air turbine (RAT) generator?

The RAT is deployed automatically if both AC transfer busses lose power in flight.

The RAT can supply electrical and hydraulic power simultaneously.

The RAT cannot be manually deployed by pushing the RAM AIR TURBINE switch if any of the AC transfer busses powered.

The RAT generator provides standby power to the C1 and C2 TRUs.

10 / 15

Which bus powers the main battery charger and the APU battery charger?

Left main bus.

Ground service bus.

Standby bus.

Right main bus.

11 / 15

Will the IDG disconnect automatically for high temperature?

no

yes

12 / 15

Does electric power has priority over hydraulic power from the RAT?

yes

no

Hydraulic has priority, and if electric is shed, only the CA instrument bus is powered through the main battery

13 / 15

You have a cold airplane (no power connected). Which items will be powered if you push the BATTERY switch ON?

The APU controller and the DC fuel pump will be powered.

Only the main battery bus will be powered.

The hot battery bus will be powered.

14 / 15

The standby electrical system consists of:

The main battery, the standby inverter, the RAT generator and its associated generator control unit and the C1 and C2 TRUs.

The main battery, the standby inverter, and the RAT generator.

The main battery and the RAT generator.

The main battery, the standby inverter, the RAT generator and the C1 and C2 TRUs.

15 / 15

Which one of the following is not true about the DC electrical system?

The left TRU powers the left main DC bus.

The DC electrical system includes the main DC electrical system and the flight control DC electrical system.

The main DC electrical system uses four transformer-rectifier units (TRUs) to produce DC power.

The C1 TRU powers the first officer's flight instrument bus.

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