AC Electrics

Question 1

Loss of the left main DC bus results in:

• Loss of auxiliary inverter
• Loss of primary inverter with no effect on left or right 400hz buses
• Loss of auxiliary and primary inverter
• Loss of primary inverter and left 400hz bus

Answer 1

• Loss of auxiliary inverter

Question 2

The AUXILIARY inverter switch on the AC CONTROL panel allows:

• The 400hz bus-tie contractor to be opened or closed
• All inverters to be selected off in an emergency
• The auxiliary inverter to power the 115v variable frequency buses
• The auxiliary inverter output to be selected manually, to the left or right 115 volt 400hz bus

Answer 2

• The auxiliary inverter output to be selected manually, to the left or right 115 volt 400hz bus

Question 3

The AC and DC generators are driven by:

• A RAM air turbine
• High-pressure bleed air
• The propeller reduction gearbox and the accessory gearbox, respectively
• The accessory gearbox and the prop reduction gearbox, respectively

Answer 3

• The propeller reduction gearbox and the accessory gearbox, respectively

Question 4

The GCU on the AC generator maintains a constant:

• Voltage of 115 AC
• Voltage of 28 DC
• Frequency and voltage
• Frequency of 400 hz

Answer 4

• Voltage of 115 AC

Question 5

If the No.1 AC generator fails, the left AC bus is powered by the:

• Right TRU
• Left TRU
• No. 2 AC generator
• Bus is not powered

Answer 5

• No. 2 AC generator