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KEY LIME STUDY 2019 > ORAL* E145 Electrical > Flashcards

ORAL* E145 Electrical Flashcards

1
Q

Is Airplane predominately AC or DC?

A

DC

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2
Q

How many generators are there?

A

4 engine, 1 APU

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3
Q

When generators are on number 1 engine?

A

1 and 3

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4
Q

Which generators are on the right engine?

A

2 and 4

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5
Q

Max amperage on Engine Gens?

A

400 amps

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6
Q

Max amps draw APU?

A

400 amps up to 30k…300 amps 30k and above

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7
Q

Battery Voltage and amps?

A

24 volt, 44 amps nicad

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8
Q

Where are batteries

A

Front electronics compartment…left side

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9
Q

Does Ground Power charge batteries?

A

No

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10
Q

Minimum battery temp for APU start?

A

-20c

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11
Q

Backup battery volts and amps

A

24 volt 5 amp lead acid

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12
Q

Inverter Specs?

A

250 VA/400 hz single phase…output 115 VAC

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13
Q

What bus powers inverter?

A

DC bus 1

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14
Q

what is the EDL?

A

Electrical Distribution Logic…controls tie contactors

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15
Q

All 4 generators are online…what are positions of bus tie contractors?

A

Bus tie 1 is open (off) and Bus tie 2 is closed (on)

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16
Q

GEN OVLD caution happens when?

A

Greater than 400 amps

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17
Q

GPU should supply at least ______amps?

A

300

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18
Q

If GPU is connected and on what light is on?

A

GPU AVAIL

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19
Q

What should GPU voltage show on MFD when connected and availbale>

A

26-29 VDC

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20
Q

Which has priority…Generators or GPU?

A

GPU takes over when connected

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21
Q

Which bus is powered with batteries OFF and GPU selected?

A

Ground Service Bus

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22
Q

What is powered by Ground Service Bus?

A 
LIGHTS......
Stair Lights
Dome Light
Galley Lights
Cabin Lights,
Lav Lights
Baggage and Service Compartment Lights
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23
Q

what is an electrical emergency?

A

Loss of all generators

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24
Q

Batteries can supply essential power for how long?

A

40 minutes…includes 3 APU start attempts

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25
Q

In Normal ops…battery 1 is connected parallel with GENS

A

1 and 3

26
Q

Battery 2 normally runs in parallel with GENS

A

2 and 4

27
Q

Which battery starts the APU

A

Battery 2

28
Q

What happens to battery 1 during APU start?

A

It’s isolated Battery 1 contactor opens

29
Q

Battery AUTO switch does what?

A

Battery contactors controlled by the EDL

30
Q

GPU is connected and selected on…what do battery contractors do?

A

OPEN….they disconnect the batteries. Batteries cannot be charged with GPU

31
Q

with battery power only on ground, do you have shed busses?

A

No

32
Q

How can you connect shed busses on ground?

A

SHED BUSES OVRD and at least one generator

33
Q

BATT OVTEMP happens when

A

More the 70 C

34
Q

Batteries less than 24v after APU start…what’s required?

A

APU must run 30 minutes to recharge

35
Q

What does Back Up Battery on Overhead panel do?

A

Backup Battery charging…

36
Q

when do EDG come on line?

A

56.4 N2

37
Q

How many gen resets?

A

1

38
Q

What 3 electrical sources can start APU?

A

GPU, Battery 2, or Battery 2 with Main gen assist

39
Q

What does backup battery power?

A

Backup hot bus, which includes the 5 GCU’s and the EDL

40
Q

Can battery 1 start APU?

A

no

41
Q

APU powers which bus?

A

CENTRAL DC

42
Q

When does APU come on online?

A

95% plus 7 seconds

43
Q

On ground when are all DC buses on?

A

a. At least 3 gens. online
b. GPU on and connected
c. One generator running and SHED OVRD

44
Q

Explain electrical config with 4 or 5 generators online

A

Left and right networks are isolated and all buses are energized

45
Q

Explain electrical config with 3 gens online

A

one network connected through bus tie contactors which are closed…all buses eneergized

46
Q

Explain elec configuration with 1 or 2 gens online

A

Same as with 3 but shed buses drop out (one network, bus tie contactors both closed)

47
Q

electrical emergency…no generators (in flight)

A

Batteries only power Essential Euses only

48
Q

Which displays still work in emergency power?

A

EICAS, RMU 1 and 2, and the ISIS

49
Q

what do avionics master buttons on overhead do?

A

Allow shutting off radios and nav during APU start to avoid spikes

50
Q

Inverter Powers what?

A

TCAS, EGPWS

51
Q

BTC 1 position with Gen 1 fail and APU off

A

closes

52
Q

BTC 1 portion with Gens 1 fail and APU on

A

opens

53
Q

What do you do is auto transfer fails with a loss of all generators?

A

Push Essential Power button

54
Q

How do you know if automatic transfer fails with a loss of all generators?

A

Displays still work

55
Q

What does Essential Power button do?

A

Overrides EDL, and makes sure batteries are only powering the essential buses

56
Q

What does SHED BUSES OVRD do?

A

closes shed buses contactor

57
Q

Will SHED BUSES OVRD work in flight?

A

Nope

58
Q

What does BUS TIES OVRD do?

A

Closes BTC’s except in overcurrent

59
Q

When is APU not seen on MFD

A

APU off and less than 10% RPM

60
Q

If airplane will sit for long period what are battery considerations

A

Remove if temps below -15c, and batteries must be removed to recharge if volts are below 19VDC

KEY LIME STUDY 2019 (22 decks)

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