B777 Electrical

Boeing 777 Electrics

Boeing 777 Electrics

1 / 15

What does the green EXTERNAL POWER AVAIL light indicate?

2 / 15

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

3 / 15

What is the primary source of power for the transfer busses?

4 / 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.

5 / 15

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

6 / 15

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

7 / 15

Backup power is provided by one variable speed, variable frequency generator mounted on each engine. A frequency converter converts the generator frequency to a constant 400 Hz. Only one backup generator can power the converter at a time.

8 / 15

What is the correct source order for powering left and right main busses in flight?

9 / 15

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

10 / 15

How many total AC sources of power does the B777 accommodate?

11 / 15

Which items below are de-powered if you position the BATTERY switch to OFF during power down?

12 / 15

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

13 / 15

Will the IDG disconnect automatically for high temperature?

14 / 15

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

15 / 15

Which one of the following is not true about Electrical Load Management System (ELMS)?

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