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Contour > Electrical > Flashcards

Electrical Flashcards

1
Q

What supplies power to the DC system?

A

Four engine driven generators
(28 VDC, 400amps)

1 APU starter generator
(28 VDC, 400amps)

Two NiCad batteries
(24VDC, 44AH)

One lead acid backup battery
(24VDC, 5AH)

Available for ground servicing: one GPU
(28VDC, 1,600amps)

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2
Q

Into how many networks is the electrical system divided during normal operations?

A

2

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3
Q

What provides system management, and protection for the electrical system?

A

Electronic distribution logic and generator control units

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4
Q

When a GPU is connected, can the APU be used for electrical power?

A

The GPU has priority over all other systems

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5
Q

Can a GPU be used to charge the batteries?

A

No

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6
Q

Which generator supplies the left electrical network?

A

1 and 3

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7
Q

To which generators is the APU normally connected in parallel

A

2 and 4

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8
Q

What is the voltage and amperage of the NiCad main batteries?

A

24V 44AH

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9
Q

To which bus are the generators connected to charge the number one battery during normal flight?

A

DC bus 1

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10
Q

Which battery provides electrical power for APU starting

A

No 2

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11
Q

When on the ground with the batteries as the only electrical power source which buses are deenergized

A

The Shed Buses

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12
Q

During APU starting, which battery is isolated from the load buses

A

No 1

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13
Q

For how long can the batteries be expected to provide power in an electrical emergency

A

40 minutes

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14
Q

What is the definition of an electrical emergency?

A

A loss of all generators

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15
Q

In an electrical emergency, to which buses only does the EDL automatically configure the system dedicated to the batteries

A

Essential and central

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16
Q

If the automatic transfer fails, how would you manually connect the batteries on the essential bus?

A

Press the essential power button on the electrical panel

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17
Q

How can all DC buses be energized with the aircraft on the ground?

A

At least three generators online

GPU on and powering the aircraft

One generator on and shed bus override selected

18
Q

Which bus is energized by connecting the GPU to the airplane with batteries off

A

Ground service

19
Q

At what battery temperature will a BATT OVTEMP warning message be shown on the EICAS

A

70°c

20
Q

What is the voltage and amperage of the backup battery?

A

24v 5Amp

21
Q

What is the purpose of the lead acid back up battery

A

It provides stabilized power for operation of the GCU protective function, even in case of a short circuit when system voltage may drop near 0 V

22
Q

What conditions must be met for the back up battery to be charged?

A

The system must be energized through a power source, other than external power, and a battery selector must be set to the auto position

23
Q

What is the primary power source for the aircraft?

A

4 28 VDC engine driven generators

24
Q

At what N2 engine speed will the aircraft generators come online?

A

56%

25
Q

At what amperage will the GEN 1 (2,3,4) OVLD caution message be generated

A

400 Amps

26
Q

What is the purpose of the GCUs

A

They isolate the generators from the DC buses, if an overvoltage is detected

27
Q

How many times can a generator be reset after a failure?

A

One time

28
Q

The APU and GPU are connected to the aircraft electrical system, through which DC bus, which also provides loads sharing in the event of generator failure or engine shutdown

A

Central bus

29
Q

When does the APU generator start supplying electrical power to the system?

A

At 95% plus 7 seconds

30
Q

When the airplane is in the air, what is the minimum system requirement for all DC buses to be kept energized

A

Three generators online

31
Q

Where can all generator currents and voltages be monitored?

A

The electrical page of the MFD

32
Q

Which lights are powered by the ground service bus?

A

Cockpit dome, lights, courtesy/stair lights, galley lights, passenger cabin lights, lavatory lights, baggage/service compartment lights

33
Q

What powers the AC system?

A

115 VAC, single phase static inverter

34
Q

Why should the avionics master push buttons be pushed out while starting the APU?

A

They disconnect some navigation and communication equipment from the load buses to prevent possible damage from voltage surge

35
Q

What is the maximum load on an engine generator?

A

400 amp

36
Q

What is the maximum load on the APU starter generator up to 30,000 feet?

A

400 amp

37
Q

What is the maximum load on the APU starter generator above 30,000 feet

A

300 amp

38
Q

What is the minimum battery temperature for the APU start?

A

-20°C

39
Q

What is the minimum battery voltage for APU start?

A

23.5 V

40
Q

Below, what voltage must the battery be physically removed from the aircraft by maintenance for recharging

A

19 V

41
Q

List the items on hot bus 1

A

Emergency locator transmitter, engine, 1/2 fire extinguisher bottle A, fuel pressure refueling, engine 1 fuel shut off valve, hydraulic shut off valve, engine 1

42
Q

What does an illuminated stripe in a button on the overhead panel mean?

A

The switch is not in its normal position For Flight

Contour (17 decks)

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