ATA 24 ELECTRICAL POWER

How is the btc power supply provided when APU GEN or EXT PWR are available. Through the GAPCU. Through the apu gen. Through the battery pack.

Why is the BTC ground path provided by the related generator control unit. To protect against over current. To control battery power. To inhibit the btc close logic.

In which situation are both BTC closed. EXT PWR only. Normal operation. Gen 2 only.

The BTC power supply is provided by the ground and auxiliary power control unit (GAPCU) when….. are available. APU GEN. IDG 1. Battery power.

With only external power on, both BTC should be closed to supply. AC BUS 1+ 2. IDG 1. Ac bus 2.

With IDG only operation, both BTC should be closed IDG supplies its own busbar and via the closed BTC also. AC BUS 1. Battery power. AC BUS 2.

APU Gen is one of the power sources with the lowest priority to supply the AC BUSES. True. False.

When APU Gen is the only power source, BTC 1 and 2 close to supply the AC power network. True. False.

With only EXT PWR on, both BTC should be open to avoid parallel operation with the generators. False. True.

The emergency generator is activated via the blue hydraulic system only if the. Landing gear is compressed. Aircraft is at cruising. Aircraft is on the ground.

If ac BUS 1 and 2 are lost above a given airspeed, the ram air turbine (RAT) will automatically. Extend. Decreased speed. Turn off.

In the case of generator 1 LINE OFF, which component opens. Generator line contactor (GLC) 1. Generator control unit (GCU). External power.

The emergency generator is powered by the. Blue hydraulic system. Red hydraulic system. Yellow hydraulic system.

The ground and auxiliary power control unit (GAPCU) interfaces only with the centralized fault display interface unit (CFDIU). True. False.

The GAPCU can transmit GCU fault data to the CFDIU via ARINC 429 data bus. True. False.

Maintenance test on the GAPCU and GCU can be initiated in-flight for diagnostic purposes. False. True.

The constant speed motor/generator (CSM/G) operates at 50 hz frecuency. False. True.

What is the priority sequence for supplying the two normal AC BUS (AC BUS 1 & AC BUS 2). Onside generator (IDG) external power, APU GEN offside generator. External power apu gen offside generator onside generator Idg. APU Gen offside generator onside generator.

What is the purpose of the 115/26v auto transformer In the ac distribution system. Connect AC ESS BUS to AC BUS 1. Convert 115v ac to 26v ac. Supply power to the APU Gen.

How is DC generation achieved in the aircraft electrical system. By transformer rectifiers (TR). Through an external power unit. Through generator drive by APU.

Which power source replaces a faulty main TR to supply the DC ESS BUS. Battery 2. External power. Battery 1.

What is the role of the emergency generator in the aircraft electrical system. Provide power in case of failure of all main generators. Connect ac bus 1 and ac bus 2 in parallel. Replace the main engine generator.

Which component is responsible for converting 115 volts to 26 volts for the sub -busbar. 115/26v auto transformer. Static inverter. Engine generators.

What is the purpose of the static inverter in the electrical system. Convert DC to AC power. Supply power to ac galleys. Replace faulty main tr units.

The static inverter connected to battery 1 supplies the AC….. bus. DC BUS 2. Ac ESS bus. Dc ESS bus.

The ac transfer circuit allows generators to be connected in parallel on the same bus. False. True.

The AC ESSential BUS can be supplied by AC BUS 2 If AC BUS 1 fails. True. False.