Boeing 777 Electrics
1 / 15
What is the primary source of power for the transfer busses?
2 / 15
Which condition(s) cause the ELEC GEN DRIVE L EICAS message to display?
3 / 15
During autoland, the busses isolate to allow three independent sources to power the three autopilot. In this case which one of the following is the power source for the right AC transfer bus, the right DC bus, and the first officer's flight instrument bus?
4 / 15
On ground no power connected to the airplane. Which items will be powered if you push the BATTERY switch ON?
5 / 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.
The standby inverter converts DC power to AC power. The inverter powers the AC standby bus if the left transfer bus is not powered.
6 / 15
How many main AC power sources are required to maintain the entire plane AC electrical load?
7 / 15
If the RAT is unable to maintain RPM, the RAT generator electrical load is shed until RPM is satisfactory. Power for standby electrical loads is provided by the main battery during deployment of the RAT and when RAT generator loads are shed.
The RAT is deployed automatically if both AC transfer busses lose power in flight. The RAT can be manually deployed by pushing the RAM AIR TURBINE switch on the overhead panel.
8 / 15
When does the right transfer bus isolate from the right main bus?
9 / 15
Which one of the following is not true about the ram air turbine (RAT) generator?
10 / 15
Which bus operates only on the ground?
11 / 15
How can you power the ground handling bus before shutdown if no external power is available?
12 / 15
The Electrical Load Management System (ELMS), manages load shed priority (galley first, utility bus second, then selected AC components).
13 / 15
Which one of the following is not true about integrated drive generators (IDGs)?
14 / 15
The standby electrical system consists of:
15 / 15
Which one of the following is not true about the DC electrical system?
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