B777 Electrical

Boeing 777 Electrics

Boeing 777 Electrics

1 / 15

During autoland, the busses isolate to allow three independent sources to power the three autopilots.

2 / 15

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

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.

4 / 15

When will the RAT auto-deploy?

5 / 15

What is the primary source of standby power if all normal AC and DC power source fail?

6 / 15

What is the secondary source of power for 'fly-by-wire' if one or more PMGs are unpowered?

7 / 15

Primary power for the flight control DC electrical system comes from permanent magnet generators (PMGs) housed within each backup generator. Variable frequency PMG AC power is used by individual power supply assemblies (PSAs) to provide DC power to the three flight control DC busses. To ensure a high level of system reliability, each PSA also has multiple AC power sources.

8 / 15

What is the primary power source for 'fly-by-wire'?

9 / 15

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

10 / 15

What provides DC power on the B777?

11 / 15

What is the primary source of DC power during normal flight?

12 / 15

Which one of the following is not true about the standby inverter?

13 / 15

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

14 / 15

Will the IDG disconnect automatically for high temperature?

15 / 15

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

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