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UPT > Electrical > Flashcards

Electrical Flashcards

1
Q

How many AC generators?

A

one for each engine

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2
Q

How many phases are the AC gens? and what Volt/Cycles?

A

3 phase
115/200V
320-480 cycles per second

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3
Q

What voltage do the AC gens operate at?

A

115 +- 2
below 108 +-2 = Rectifier failure PFL

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4
Q

What is the gen cut in range?

A

43-48%

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5
Q

What is the gen shift range?

A

65-75%

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6
Q

Can the gens be stopped?

A

No, only disconnected from the buses

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7
Q

What can you do if a gen fails?

A

Reset it

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8
Q

What do the bus contactors do?

A

Connect generators to the buses per the protection panels signal

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9
Q

What does the protection panel do?

A

protects the buses from a bad gen and the gen from a bad bus, also controls crossover

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10
Q

What do TRUs do?

A

Convert AC to DC power

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11
Q

What V and Amp are TRUs?

A

28 VDC
50 AMP

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12
Q

What warrants a PFL concerning TRU?

A

Failure or output below 25.5 Volts

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13
Q

What light comes on for dual TRU fail?

A

XMFR RECT OUT

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14
Q

Do the TRUs power all 3 DC buses?

A

Yes, via a diode module

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15
Q

What volts and Amps is the battery?

A

24 Volt
10 Amp

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16
Q

How long does the battery last on 80% charge?

A

15 min

17
Q

What does the battery do?

A

supplies DC power to essential DC busses without TRU

18
Q

When does the battery connect and disconnect?

A

18 Volts
10 Volts

19
Q

What are the autosyn instruments?

A

Hydraulics
Oil Px
Fuel Flow
Oxygen

20
Q

What is the power and cycles of the APU?

A

115/200 V
400 Cycles per second

21
Q

How is the static inverter activated?

A

pressing the start button (30 sec)
selecting MAX
OXY/Fuel check switch held in GAGE TEST

22
Q

What does the static inverter do?

A

powers 1st engine on start up
operation of right autosyn
oxygen indicators

23
Q

How long will the standby ADI last without power?

A

9 min of life and +/- 6 deg accuracy

UPT (16 decks)

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