B777 ELECTRICALS Quiz

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

APU battery

Main battery

Transformer rectifier units

DC generators

3. What provides DC power on this airplane?

DC generators

Standby inverters

Transfer busses

Transformer rectifier units

4. What does the green EXTERNAL POWER AVAIL light indicate?

External power is disconnected from the airplane.

External power is connected to all the airplane's electrical busses.

Electrical power is available to the electrical busses but may not be correct.

External power is connected to the airplane and the voltage and frequency are within limits.

5. Which bus operates only on the ground?

The ground service bus

The ground handling bus

The left main AC bus

The right transfer bus

6. When does the right transfer bus isolate from the right main bus?

Never

During descent

When system configures to autoland

When main AC busses are powered

7. What is the electrical configuration during autoland?

The right transfer bus isolates from the right main AC bus.

The left transfer bus isolates from the right main bus.

There is no change from normal.

The left transfer bus isolates from the right transfer bus.

8. What items are load shed first by the Electrical Load Management System if the electrical loads exceed the power available?

The load shedding sequence is galleys first and the utility busses.

The individual items causing the exceedance are shed first followed by the galleys.

Only the utility busses load shed.

All non-essential items on the main AC busses load shed.

9. What is the source of standby electrical power if the RAT sheds electrical power because of low hydraulic pressure?

APU

Backup generators

Main battery

DC busses

10. How can you power the ground handling bus before shutdown if primary external power is not available?

Select the ground handling bus ON.

The bus is powered as long as the right main bus is powered.

Connect the secondary external power source.

Start the APU.

11. What is the primary electrical power source for flight control system?

Battery

Main AC busses

Permanent magnet generators

APU

12. What automatic switching will occur if you start the APU with primary and secondary external power on the BUS TIE system?

The APU connects to the BUS TIE switches but does not power either main bus.

The APU connects to the BUS TIE and replaces secondary external power on the left main bus.

The APU connects to the BUS TIE and replaces primary external power.

The APU powers both main buses.

13. What happens in flight when both transfer busses become unpowered?

The APU starts automatically, regardless of the APU selector position.

The RAT powers both transfer busses

No other power source is available so only the standby bus remains powered until pilot action

The APU must be manually started and connected to the transfer busses

14. What is the alternate source of power for the ground handling bus?

Secondary external power

Left transfer bus

APU

Right transfer bus

15. Which system does not have AC power removed when the IFE/PAS switch is placed in the OFF position?

All In Flight Entertainment systems

Personal computer power outlets

Telephones

Emergency Locator Transmitter

16. How are the main AC busses powered if the right engine is started with the APU powering the left bus system and external power powering the right bus system?

External power continues to supply the right main bus.

The right engine generator automatically powers both main busses.

The right engine generator automatically powers the right main bus.

The right engine generator automatically powers the left main bus.

17. Which system does not have AC power removed when the CABIN/UTIL switch is placed in the OFF position?

Utility Busses

Galleys

Left forward main tank fuel pump

Miscellaneous cabin systems loads on the Ground Service Bus

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

Ram air turbine

Backup generators

Engine generators

Main DC busses

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

The APU battery and hot battery bus

The engine fire extinguisher bottles and APU fire extinguisher bottle

The AC standby bus, the Captain's flight instrument bus, and the left and center flight control busses

The F/O's flight instrument bus and the left and right transfer busses

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

APU

Main battery

Backup generators

RAT generator

21. What is the secondary source of power for flight control system if one or more PMGs are unpowered?

Hot battery bus

DC busses

Left transfer bus

Main AC busses

22. What will occur if a single IDG is powering both buses, and the PRIMARY EXTERNAL POWER switch is selected ON?

Primary external power connects to both busses and the IDG power source is removed.

Primary external power connects to the bus which is normally powered by the non-operating IDG.

The single IDG will continue to power both busses.

External power cannot be applied in this situation.

23. What components make up the Standby Electrical System?

The main battery, the standby inverter, the APU battery, the L TRU and R TRU

The main battery, the standby inverter, the RAT generator amd its associated generator control unit

The main battery, the standby inverter, the L TRU and R TRU

24. Which of the following statements about the standby inverter is not correct?

The standby inverter converts DC power to AC power.

The inverter powers the AC standby bus if the left transfer bus is not powered.

The standby inverter normally receives DC power from the Battery Bus.

The standby inverter can not receive DC power from the RAT generator through TRU

25. Which condition(s) cause the EICAS message ELEC GEN DRIVE L to display?

Generator drive oil temperature is high.

Generator drive oil pressure is low.

GENERATOR CONTROL switch selected to OFF.

Generator drive oil temperature is high or generator drive oil pressure is low.

26. The standby inverter converts DC power to AC power. Which bus provides DC power to the Standby Inverter and which AC bus is powered by the Standby Inverter?

The Battery Bus and the Standby Bus

The Hot Battery Bus and the Standby Bus

The Battery Bus and the Captain's Flight Instrument Bus

The Hot Battery Bus and the L Transfer Bus

B777 Electricals Quiz

1. What is the correct electrical panel configuration for normal flight?

2.

What first name or nickname would you like us to use?

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

3. What provides DC power on this airplane?

4. What does the green EXTERNAL POWER AVAIL light indicate?

5. Which bus operates only on the ground?

6. When does the right transfer bus isolate from the right main bus?

7. What is the electrical configuration during autoland?

8. What items are load shed first by the Electrical Load Management System if the electrical loads exceed the power available?

9. What is the source of standby electrical power if the RAT sheds electrical power because of low hydraulic pressure?

10. How can you power the ground handling bus before shutdown if primary external power is not available?

11. What is the primary electrical power source for flight control system?

12. What automatic switching will occur if you start the APU with primary and secondary external power on the BUS TIE system?

13. What happens in flight when both transfer busses become unpowered?

14. What is the alternate source of power for the ground handling bus?

15. Which system does not have AC power removed when the IFE/PAS switch is placed in the OFF position?

16. How are the main AC busses powered if the right engine is started with the APU powering the left bus system and external power powering the right bus system?

17. Which system does not have AC power removed when the CABIN/UTIL switch is placed in the OFF position?

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

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

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

21. What is the secondary source of power for flight control system if one or more PMGs are unpowered?

22. What will occur if a single IDG is powering both buses, and the PRIMARY EXTERNAL POWER switch is selected ON?

23. What components make up the Standby Electrical System?

24. Which of the following statements about the standby inverter is not correct?

25. Which condition(s) cause the EICAS message ELEC GEN DRIVE L to display?

26. The standby inverter converts DC power to AC power. Which bus provides DC power to the Standby Inverter and which AC bus is powered by the Standby Inverter?