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Atlas B767 Oral Prep > Electrical > Flashcards

Electrical 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 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 center fuel boost pump, both recirc fans, and 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 Bus Tie Breaker

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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 or STBY power switch is in the OFF position

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7
Q

What normally powers the Battery Bus during cruise?

A

Left DC bus

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8
Q

Inflight the left generator trips off. What electrical buses are lost?

A

The two UTILITY buses and the galley buses.

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9
Q

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

A

The ground handling bus

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10
Q

What automatically has the highest priority on the left main AC bus?

A

Left engine driven generator

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11
Q

With external power available and 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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12
Q

What electrical bus powers the discharge squibs for the fire extinguisher bottles?

A

The hot battery bus

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13
Q

What bus powers most of the fire detection systems?

A

Battery bus

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14
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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15
Q

Which has priority in supplying the ground handling bus?

A

External power

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16
Q

What is required to enable the Captain’s 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

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17
Q

When can the ground handling bus be powered?

A

Only on the ground

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18
Q

When will the utility buses be shed during an engine start?

A

Only when the APU is supplying electrical and pneumatic power

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19
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

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20
Q

During triple channel approach, the left generator is lost at 140’ RA. As a result, the left main AC bus is lost. True/False?

A

True

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21
Q

What action would cause the engine generators to trip off?

A

Pushing the External Power switch ON

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22
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

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23
Q

With the Generator Control switch ON, what automatically closes when the engine starts?

A

Generator breaker only

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24
Q

Which has priority in supplying the ground handling bus: the APU or External Power?

A

External power

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25
Q

When will the APU Generator Control OFF light illuminate?

A

When the APU generator breaker opens due to a fault

26
Q

The left main DC bus can power the battery bus with the battery switch off. True/False?

A

True

27
Q

What normally powers the battery bus during cruise?

A

The left main DC bus

28
Q

What is powering the standby buses?

A

Left main AC and left main DC

29
Q

The APU can be used to power the left main AC bus while the right engine generator is powering the right main AC bus. True/False?

A

True

30
Q

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

A

Respective main AC bus

31
Q

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

A

Arms the automatic operation of the AC and DC bus tie system

32
Q

With the Bus Tie switch in AUTO, what causes the AC Bus ISLN light to illuminate?

A

Bus fault has occurred

33
Q

Pushing a Generator Control switch off opens both the field and generator breakers. True/False?

A

True

34
Q

Pushing the Generator Control switch off and then on resets the fault trip circuitry. True/False?

A

True

35
Q

What does the run light on the APU panel indicate?

A

That the APU is at operating speed

36
Q

Will the Generator Control Breaker close automatically when the voltage and frequency of the respective IDG are within limits?

A

Yes

37
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

38
Q

What can cause the DRIVE light of the GEN DRIVE DISC switch to illuminate?

A

The generator drive disconnect switch is pressed, High oil temp, Low oil pressure

39
Q

How many electrical buses are there in the Standby Power System?

A

4

40
Q

How is the hot battery bus normally powered?

A

Right main AC bus through the ground service bus and the main battery

41
Q

The battery bus is normally powered by the…?

A

Left DC bus

42
Q

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

A

The main battery

43
Q

The left main DC bus can charge the battery bus with the battery switch in the OFF position. True/False?

A

True

44
Q

The standby AC bus is normally powered by the…?

A

Left main AC bus

45
Q

The standby DC is normally powered by the…?

A

Left main DC bus

46
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

47
Q

An amber standby bus off light illuminates and the EICAS message Standby Bus Off displays when?

A

Either standby AC or DC bus is unpowered

48
Q

What is the priority of power supply to the main AC buses?

A

Respective engine-driven generator, APU generator, opposite engine-driven generator

49
Q

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

A

The switch is off or a fault has occurred

50
Q

The AC bus tie switch must be on for the DC bus tie breaker to operate. True/False?

A

True

51
Q

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

A

APU or external power

52
Q

Both batteries (main and APU) receive power directly from which source?

A

Ground service bus

53
Q

What is the alternate source of power for STBY AC?

A

Battery bus (through and inverter)

54
Q

When the utility bus switch is “on”, the utility bus is connected to the…?

A

Respective main AC bus

55
Q

The HDG is supplied from which hydraulic system?

A

Center

56
Q

Which condition is not an example of load shedding?

A

Left or right AC bus load shedding

57
Q

When will the utility bus shed during an engine start?

A

Only when the APU is supplying electrical and pneumatic power

58
Q

With the Standby Power Selector in the BAT (Battery) position…

A

The main battery and standby inverter powers the standby AC bus

59
Q

Which electrical power sources can provide for the Lower Cargo Doors, Main Cargo Door, and Fueling Panel?

A

External power (AVAIL or ON) or APU generator

60
Q

What happens when you push a Generator Drive Disconnect (DRIVE DISC) switch?

A

Disconnects IDG from engine when above idle speed and opens related Generator Control Breaker

Atlas B767 Oral Prep (17 decks)

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