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+4)+"@## > 900 Electrical > Flashcards

900 Electrical Flashcards

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1
Q

Each IDG consists of

A

A constant speed drive and a generator

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2
Q

The IDG automatically disconnects when

A

tempurature or torque limits are exceeded.

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3
Q

The ADG continues to operate and supply power to the ADG bus until what airspeed?

A

Approximately 140 kts

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4
Q

Can the ADG deployed on the ground?

A

Automatic deployment is inhibited on the ground by a wait on wheels switch.

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5
Q

The power supply priority for AC electrical is

A

On side generator

APU

Off side generator

Ground power

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6
Q

What power sources are available for the service configuration

A

Either external power or the APU generator

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7
Q

What buses are powered in the service configuration

A

AC service bus

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8
Q

The ADG is automatically deployed if

A

there is a loss of power to both AC bus 1 and 2.

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9
Q

The ADG bus supplies power to

A

The AC Essential bus

Hydraulic pump 3b

Flaps and slats at half speed

Pitch trim channel 2

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10
Q

Main battery amp and volt

A

17 amp hour /24 volt nickel cadmium battery

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11
Q

APU battery amp and volt

A

43 amp hour. 24 V nickel cadmium battery

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12
Q

From what source is each battery charged?

A

The main battery is charged by AC bus one.

The APU battery is charged by AC service bus.

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13
Q

The APU generator is driven by

A

Directly by the APU gearbox

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14
Q

What powers the DC emergency bus

A

The DC battery bus and the APU batt direct bus (Continuously)

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15
Q

Failure of one Essentil TRU?

A

ESS tie connector closes

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16
Q

What will occur if we lose both Essential TRU’s

A

Cross tie closes

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17
Q

If complete loss of AC power Will The essential tie close?

A

Yes… To connect the DC essential bus to the battery bus for emergency power

18
Q

If the DC service which is selected on,

A

The DC service bus is powered from the APU battery direct bus

19
Q

EMER POWER ONLYmsg?

A

Indicates the ADG has deployed

20
Q

AC service bus is normally powered from AC bus two.. On the ground?

A

Powered from the APU or external power

21
Q

If power is restored by pressing thePWR XFR OVERRIDE button..what happens?

A

Restored IDG willpower AC bus one and two However the ADG will continue to power The critical flight controls and the ADG bus

22
Q

DC power is supplied by

A

4 TRU’s and two batteries

23
Q

What’s feeds the DC emergency bus

A

Both the battery bus and the APU battery direct bus

24
Q

Which is on the emergency bus

A

Hydraulic SOV Engine fuel SOv APU fuel SOV Firex

25
Q

Power for starting the APU is provided by

A

APU battery

34
Q

How many AC buses

A

4

35
Q

How many DC buses

A

9

36
Q

The APU. Generator is driven?

A

Directly by the APU gearbox (At a constant speed) (W/its own GCU)

37
Q

Failure of an IDG Will automatically transfer the load from the failed IDG to the remaining operative IDG For any reason other than?

A

A fault on its associated

38
Q

Max TRU load in flight

A

120 Amps

39
Q

Maximum time with DC power only for CRT displays

A

Five minutes

40
Q

What is the constant speed drive depicted as on the synoptic page?

A

IDG

41
Q

Can the AC ESS bus transfer happen both automatically and manually?

A

Yes

42
Q

What does the AC service bus provide power for

A

Passenger cabin and lavatory cleaning

43
Q

When does the DC utility bus shed?

A

When the main Tie closes

44
Q

ADG Will continue to operate and supply power until

A

135 kts

45
Q

Where are thTRUs located?

A

In the nose.

46
Q

On EMER PWR you will have electrical power for approximately

A

30 minutes

47
Q

The voltages of the AC and DC electrical systems are

A

115V and 28V

48
Q

The constant speed drive in the IDG is cooled by,

A

An air/oil heat exchanger Using N1 fan air

49
Q

What are the 4 AC buses

A

AC bus 1

AC bus 2

AC essential bus

AC service bus

50
Q

Bus protection is provided by the?

A

ACPC, GCU and other electrical relays

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