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UAL 737NG Systems (pitu) > Electrical > Flashcards

Electrical Flashcards

1
Q

What is the minimum battery voltage for APU start?

A

23 volts

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2
Q

Primary electrical power is provided by ______ engine driven integrated drive generators (IDGs).

A

two

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3
Q

What occurs when a source of power is connected to a bus system?

A

it automatically disconnects an existing source

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4
Q

The APU generator can supply power to ____________ on the ground and inflight

A

both transfer busses

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5
Q

A GRD POWER AVAILABLE light provides flight deck indication that AC ground power is ____________________.

A

connected to the aircraft and meets aircraft power quality standards

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6
Q

If the BUS TRANS switch is in the AUTO position and the source powering the transfer bus is disconnected or fails, the source powering the opposite transfer bus _________________ through the BTBs.

A

automatically picks up the unpowered transfer bus

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7
Q

For single generator operation, the system is designed to ___________.

A

shed electrical load incrementally

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8
Q

The amber DRIVE caution light is illuminated when ____ oil is sensed in the IDG.

A

low

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9
Q

After the IDG disconnect switch is used to disconnect the IDG from the engine, it _________ possible to reactivate the IDG in flight.

A

is not

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10
Q

IDG low oil pressure can be caused by which of the following:

A

() all answers are correct
() IDG automatic disconnect due to high oil temperature
() IDG disconnected through the generator drive DISCONNECT switch

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11
Q

On the ground, an amber _______ light illuminates to indicate the DC system or standby system equipment has failed. This light is inhibited in flight.

A

ELEC

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12
Q

The three transformer rectifier (TR) units convert 115-volt AC to _______ DC.

A

28v

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13
Q

Inflight, an amber TR UNIT light illuminates _________.

A

TR1 or TR2 and TR3 has failed

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14
Q

A fully charged battery has sufficient capacity to provide electrical power for a minimum for ________.

A

30 minutes

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15
Q

An amber BAT DISCHARGE light illuminates when _________.

A

excessive battery discharge is detected

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16
Q

During normal operation the guarded Standby Power Switch will be in _____ and the battery switch will be _____.

A

AUTO; ON

17
Q

An illuminated STANDBY Power (PWR) OFF Light indicates one or more of the following buses are unpowered

A

all answers are correct

  • AC standby bus, DC standby bus
  • battery bus
18
Q

With the STANDBY POWER Switch in AUTO (guarded position) in flight or on the ground with the loss of all AC power, the AC standby bus is powered by __________________ and the DC standby bus is powered by _____________.

A

battery through static inverter; battery

19
Q

Maintenance (MAINT) Test Switch on the AC and DC Metering Panel is typically used by ________.

A

maintenance

20
Q

What is the function of the DC Meters Selector?

A

selects the DC source for the DC voltimeter and the DC ammeter indications

21
Q

What is the function of the AC Meters Selector?

A

selects the AC source for the AC voltimeter, AC ammeter and frequency meter indications

22
Q

With ground power available, moving the Ground (GRD) Power Switch to the ON position

A

all answers are correct

  • removed previously connected power from AC transfer busses
  • connects ground power to AC transfer busses if power quality is correct
23
Q

What light on the overhead panel illuminates if the transfer bus is not being powered?

A

TRANSFER BUS OFF

24
Q

What light on the overhead panel illuminates if the transfer bus is not powered by the source selected by the related generator switch?

A

SOURCE OFF

25
Q

What light on the overhead panel illuminates if the IDG is not supplying power to the related transfer bus?

A

GEN OFF BUS

26
Q

On the B737-800, moving the Generator (GEN) Switch to ON, connects ___________ by disconnecting the previous power source and closing the generator circuit breaker.

A

IDG to the AC transfer bus

27
Q

What light on the overhead panel illuminates if the APU is running and not supplying power to a bus?

A

APU GEN OFF BUS

28
Q

Which switch provides manual control of ground service busses enabling servicing of the aircraft using external power without activating AC transfer busses?

A

GROUND SERVICE switch on the FWD attendant panel

UAL 737NG Systems (pitu) (15 decks)

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