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United B737 (pitu) > Electrical > Flashcards

Electrical Flashcards

1
Q

What is the minimum battery voltage for APU start?

()19 volts

()23 volts

()28 volts

A

23v

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2
Q

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

()3

()2

()4

A

2

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3
Q

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

()It automatically accepts the most powerful source

() It automatically disconnects an existing source

() the sources are paralleled and then accepted

A

it automatically disconnects an existing source

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4
Q

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

() connected to the aircraft and meets aircraft power quality standards

() connected to the aircraft and may or may not meet aircraft power quality standards

() is powering the main bus

A

connected to the aircraft and meets aircraft power quality standards

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5
Q

Which of the following will automatic load sensing shed first during single generator (engine generator) operations?

() Galleys and main bus on Transfer Bus 1

() In Flight Entertainment (IFE) busses

() Galleys and main bus on Transfer Bus 2

A

Galleys and main bus on Transfer Bus 2

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6
Q

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

() high
() low
() all answers are correct

A

low

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7
Q

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

()is

()is not

A

is not

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8
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.

() ELEC

() TR UNIT

() BAT DISCHARGE

A

elec

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9
Q

Inflight, an amber TR UNIT light illuminates _________.

() TR1 or TR2 and TR3 has failed

() TR1 or TR2 or TR3 has failed

() all TRs have failed

A

TR1 or TR2 and TR3 has failed

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10
Q

An amber BAT DISCHARGE light illuminates when _________.

() a thermal runaway is occurring

() excessive battery discharge is detected

() the battery has failed

A

excessive battery discharge is detected

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11
Q

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

() AC standby bus, DC standby bus

() battery bus

() all answers are correct

A

All answers are correct

AC standby bus, DC standby bus

battery bus

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12
Q

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

() flight attendants

() maintenance

() pilots

A

maintenance

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13
Q

What is the function of the DC Meters Selector?

() selects the AC source for the DC Voltmeter and the AC Ammeter indications

() selects the DC source for the DC Voltmeter and the DC Ammeter indications

() selects the Standby Battery static inverter AC Ammeter indications

A

selects the DC source for the DC Voltmeter and the DC Ammeter indications

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14
Q

What is the function of the AC Meters Selector?

() selects the AC source for the AC Voltmeter, AC Ammeter and frequency meter indications

() selects the DC source for the AC Voltmeter and the DC Ammeter indications

() selects the Standby Battery static inverter AC Ammeter indications

A

Selects the AC source for the AC Voltmeter, AC Ammeter and frequency meter indications

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15
Q

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

()Transfer bus off

()DRIVE

()ELEC

A

TRANSFER BUS OFF

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16
Q

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

()ELEC

()GEN OFF BUS

()DRIVE

A

GEN OFF BUS

17
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.

() IDG to the DC Main Bus

() IDG to the AC Transfer Bus

() all answers are correct

A

IDG to the AC Transfer Bus

18
Q

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

() APU GEN OFF BUS

() DRIVE

() ELEC

A

APU GEN OFF BUS

19
Q

Positioning the standby power switch to the BAT position

() all choices are correct

() overrides automatic switching

() places AC standby bus, DC standby bus and Battery Bus on battery power

A

All answers are correct

overrides automatic switching

places AC standby bus, DC standby bus and Battery Bus on battery power

20
Q

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

() both transfer busses

() one transfer bus

() 2 transfer busses to 10,000 feet, above 10,000 feet only one transfer bus can be powered.

A

both transfer busses

21
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.

() automatically picks up the unpowered transfer bus

() can be selected to power the unpowered transfer bus

() cannot power the unpowered transfer bus

A

Automatically picks up the unpowered transfer bus

22
Q

For single generator operation, the system is designed to________.

() shed electrical load incrementally

() shed electrically both generator buses

() all answers are correct

A

Upgrade To Pro
shed electrical load incrementally

*galley and main bus shed first

23
Q

The Amber drive caution light is illuminated when ____ oil is sensed in the IDG.

() Low

() High

() All answers are correct

A

low

24
Q

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

()possible

()is not possible

A

not possible

25
Q

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

() IDG automatic disconnect due to high oil temperature

() IDG disconnected through the generator drive disconnect switch

() All answers are correct

A

() All answers are correct

() IDG automatic disconnect due to high oil temperature

() IDG disconnected through the generator drive disconnect switch

26
Q

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

() 30 minutes

() 45 minutes

() 60 minutes

A

30 minutes

27
Q

During normal operation the guarded Standby Power Switch will be in _____ and the battery switch will be _____.
() AUTO; ON
() AUTO; either OFF or ON
() BAT; ON

A

AUTO; ON

28
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 _____________.

() battery through static inverter; battery

() AC transfer Bus 2; TR3

() 115V AC Main Bus 2; TR2

A

battery through static inverter; battery

29
Q

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

()ELEC

() SOURCE OFF

() DRIVE

A

source off

30
Q

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

()CAB/UTL Switch on the Overhead Panel

() IFE/PASS SEAT Switch on the Overhead Panel

() GROUND SERVICE Switch on the FWD Attendant Panel

A

GROUND SERVICE Switch on the FWD Attendant Panel

United B737 (pitu) (17 decks)

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