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Oral Prep 767 > Electrical Atlas > Flashcards

Electrical Atlas Flashcards

1
Q

During takeoff if the right engine generator fails, what happens to the utility and galley power?

A

Both utility and galley buses will be shed

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2
Q

Where is the ground service switch which is used to power the ground service bus located?

A

Forward cabin flight attendant panel

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3
Q

In flight, the left engine is shut down. What electrically powered items are lost?

A

Both Utility buses
The left centre fuel boost pump
Both Recirc fans
The C2 hydraulic pump

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4
Q

The AVAIL light on the external power switch is an indication of what?

A

The external power cart is plugged in and the volts and frequency are within limits

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5
Q

What is accomplished by pushing the AC Bus Tie Switch to AUTO?

A

Arms the automatic operation of the AC and DC Bus Tie Breakers

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6
Q

What causes the Standby Power Bus OFF light to illuminate?

A

Loss of the standby AC or DC bus
The Standby power switch in the OFF position

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7
Q

What will cause the Generator Drive light to illuminate?

A

High oil temperature; or
Low oil pressure

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8
Q

What normally powers the Battery Bus?

A

The left DC bus

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9
Q

Inflight the left generator trips off.

What electrical buses are lost?

A

The two (2) UTILITY buses
Galley Buses

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10
Q

Which bus is powered automatically when external power is plugged in?

A

The ground handling bus

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11
Q

What is the priority for powering the electrical systems?

A

GPU
ONSIDE ENG GPU
APU
CROSS SIDE ENGINE GPU

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12
Q

With the APU supplying both electrical and pneumatic power, what happens as the first engine is started?

A

Both utility buses trip off

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13
Q

What electrical bus powers the fire detection systems?

A

Battery Bus

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14
Q

What electrical bus powers ENG/APU/CARGO fire extinguishing bottles?

A

The hot battery bus

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15
Q

What is an integrated drive generator (IDG)?

A

Generator and CSD (constant speed drive) in one casing using the same oil

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16
Q

What is required to enable the Captains flight instrument transfer bus to transfer with the loss of the left main AC?

A

Both the left and right Bus Tie Switches must be in AUTO

17
Q

With the APU supplying both electrical and pneumatic power:

What happens as the second engine is started?

A

Only the utility bus for the engine being started trips off

18
Q

During a triple channel approach, the left generator is lost at 140 feet:

What electrical bus, if any, is lost?

A

The Left Main AC Bus

19
Q

With the APU supplying electrical power, what happens when the first engine starts (reaches idle RPM)?

A

The engine driven generator powers its respective main AC Bus only

20
Q

With the Generator Control switch ON:

What automatically closes when the engine starts?

A

Generator breaker only

21
Q

When will the APU generator control OFF light illuminate

A

When the APU Generator breaker opens due to a fault

22
Q

What is powering the standby busses?

A

Left main AC; and
Left main DC

23
Q

In a single engine scenario.
How can the flight crew maintain electrical system redundancy?

A

By starting the APU and using the APU generator if available

24
Q

To what bus is the utility bus connected, when the utility bus switch is ON?

A

Respective main AC bus

25
Q

With the bus tie switch in AUTO:

What causes the AC Bus ISLN light to illuminate?

A

Bus fault has occured

26
Q

What does pushing the Generator Control switch off and then on accomplish?

A

It resets the fault trip circuitry

27
Q

What does the run light on the APU control panel indicate?

A

That the APU is at operating speed

28
Q

Will the GCB close automatically when the voltage and frequency of the respective IDG are within limits?

A

Yes

29
Q

What has occurred if during flight an off light illuminates and the “ON” indicator is visible in the generator control switch?

A

A fault has occurred and the generator control circuit breaker has automatically opened.

30
Q

What could cause the generator drive light to illuminate?

A

High oil temperature
Low Oil Pressure

31
Q

How many electrical buses are there in the standby power system?

A

Four (4)

32
Q

What is the backup source of power for the battery bus if the normal source is not available?

A

The main battery

33
Q

The standby AC bus is normally powered by the?

A

Left main AC Bus

34
Q

The standby DC is normally powered by the

A

The left main DC bus

35
Q

With a loss of main AC and DC power what provides electrical power to the standby AC and DC buses?

A

The main battery

36
Q

What does an ISLN light mean in the bus tie switch?

A

The switch is off or a fault has occurred

37
Q

The ground handling bus can only be powered on the ground by?

A

APU or external power

38
Q

What is the alternate source of power for the STBY AC?

A

Oral Prep 767 (37 decks)

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