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756 Training > Electrical > Flashcards

Electrical Flashcards

1
Q

752/763: According to the graphic, which electrical busses are still being powered? (HMG not operating)

A

Hot battery bus, battery bus, standby DC bus, standby AC bus

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2
Q

757/767: The integrated drive generator (IDG) oil is cooled by:

A

A fuel/oil heat exchanger

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3
Q

757/767: The main aircraft battery and the APU battery are connected to their own respective battery chargers. Both battery chargers are powered by the:

A

Ground service bus

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4
Q

757/767: Once commanded to operate, are there limitations associated with how long the hydraulic motor generator (HMG) can run?

A

No, there is no time limit for HMG operation

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5
Q

757/767: According to the graphic, the right utility bus OFF light is illuminated. What is the cause for its illumination?

A

The right utility bus is unpowered

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6
Q

757/767: When the associated AC bus tie breaker is armed for automatic operation, the AC busses are powered according to the following system priorities:

A

Respective IDG, APU generator, opposite IDG

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7
Q

757/767: According to the graphic, the BUS TIE ISLN light is illuminated. This occurs when:

A

The AC bus tie breaker is locked open from a fault trip

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8
Q

757/767: The main DC electrical system is powered:

A

By the transformer-rectifier units (TRU’s) powered by the main AC busses

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9
Q

757/763: If primary AC power is lost on both main AC busses during flight, the hydraulic motor generator (HMG) automatically starts and supplies AC power to the:

A

Left and right AC transfer busses, standby AC bus via the left AC transfer bus, and Captain’s flight instrument transfer bus

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10
Q

767: The left recirculation fan is powered by the:

A

Left utility bus

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11
Q

753/764: During hydraulic motor generator (HMG) operations, what is the status of the IRUs?

A

All three IRU’s remain powered

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12
Q

757/767: According to the graphic, the L GEN DRIVE DISC DRIVE light is illuminated. What is the cause for its illumination?

A

The associated generator drive oil temperature is high or oil pressure is low

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13
Q

757/767: According to the graphic, what is providing power to the standby busses?

A

Left main AC and DC

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14
Q

757/767: During flight, the hydraulic motor generator (HMG) automatically starts and supplies AC and DC power:

A

When primary AC power is lost on both main AC busses during flight

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15
Q

757/763: On a three autopilot approach with a LAND 3 indication, what will the ASA indicate if an engine-driven generator is lost below 200 feet AGL without the APU running?

A

LAND 3

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16
Q

757/767: As the first engine is started with APU supplying electrical and pneumatic power, what load shed occurs?

A

Both utility and all galley busses load shed

17
Q

757/767: According to the graphic, what is providing power to the Ground Handling bus?

A

External electrical power

18
Q

757/767: The ground service bus is normally powered by the:

A

Right main AC bus

19
Q

757/767: The center busses transfer from the left main busses directly to the static inverter and the hot battery bus when:

A

At least two generators are operating and three autopilots are armed for an autoland approach

20
Q

757/767: According to the graphic, the standby power bus OFF light is illuminated. Which bus(ses) is/are not powered?

A

Standby AC, standby DC, or battery bus(ses) not powered

21
Q

757/767: According to the graphic, the DISCH light is illuminated. The main aircraft battery:

A

Is discharging

22
Q

757/767: When external or APU electrical power is available on the ground, which bus is automatically powered?

A

Ground handling bus

23
Q

757/767: The associated utility and galley busses have shed due to a generator overload. What is required to restore power to the bus?

A

The utility busses (and therefore galley busses) must be reset manually

24
Q

757/767: In the case of a generator overload, which busses automatically load shed?

A

Associated utility and galley busses

756 Training (16 decks)

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