Electrical Flashcards

1
Q

The two basic principles of operation for the 737 Electrical System are (Select ALL correct answers):

A

There is no paralleling of the AC sources of power.

Main Busses shed Transfer Busses inflight.

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2
Q

Sources of AC power include _____. (Select ALL correct answers)

A

Battery through Static Inverters.
APU Generator
Engine-Driven Generators

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3
Q

Illumination of the Generator DRIVE light (amber) indicates the respective IDG experienced low oil pressure due to ________.

A

IDG failure
engine shutdown
IDG auto-decouple due to high oil temperature

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4
Q

Placing the GRD PWR switch ON _____.

A

connects external electrical power to both Transfer Busses

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5
Q

The BUS TRANSFER switch”,” in the AUTO (guarded) position”,” allows _______.

A

Bus Tie Breakers (BTB) to operate automatically

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6
Q

Which light(s) indicate(s) the APU generator is ready-to- load”,” but not powering a bus?

A

APU GEN OFF BUS (bright blue)

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7
Q

If neither AC Transfer Bus is powered by an IDG”,” momentarily positioning either APU GEN switch to ON ______.

A

connects APU generator power to both Transfer Busses
illuminates the opposite SOURCE OFF (amber) light
disconnects external power”,” if connected, from both Transfer Busses

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8
Q

When the APU generator is powering Transfer Bus 1”,” Transfer Bus 2 can be powered with _____. (Select ALL of the correct answers.)

A

the APU Generator

IDG2

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9
Q

The APU generator”,” operating in flight as a single electrical source ______.

A

automatically sheds the Galley and Main Busses

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10
Q

Moving a GEN1 or GEN 2 (Generator) switch to ON _____.

A

extinguishes the related GEN OFF BUS light
connects related IDG to Transfer Bus
disconnects previous source from the related Transfer Bus

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11
Q

If the aircraft takes off with the APU generator powering both Transfer Busses”,” and the APU fails or is shut down”,” the _____ automatically connects IDGs to their respective Transfer Bus.

A

Automatic Generator On-line Feature

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12
Q

Illumination of the ELEC light (amber) _____ indicates a fault in the _____ Power System.

A

on the ground / DC or Standby

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13
Q

The Cross Bus Tie Relay automatically opens and isolates DC Bus 1 from DC Bus 2 ______.

A

at Glide Slope capture during a Flight Director or Autopilot ILS approach

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14
Q

The _____ Bus is always connected to the battery.

A

Hot Battery

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15
Q

BAT DISCHARGE light (amber) illuminates when _____ battery discharge is detected in the Main Battery and/or Auxiliary Battery.

A

excessive

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16
Q

When standby electrical power is required”,” the A/C standby bus is powered by _______.

A

the Main and Auxiliary Battery via the static inverter

17
Q

Two fully-charged batteries have sufficient capacity to provide standby power for a minimum of _____ minutes.

A

60

18
Q

With the STANDBY POWER switch in _____”,” the batteries power the standby loads after losing all engine or APU electrical power _____.

A

AUTO / in the air and on the ground

19
Q

The _____ convert(s) battery power for use by the AC Standby Bus.

A

Static Inverter

20
Q

The STANDBY POWER switch is in AUTO. With the loss of all engine and APU electrical power”,” the batteries will be powering the: (Select ALL correct answers.)

A

Battery Bus
AC Standby Bus via the static inverter
DC Standby Bus
Hot Battery Bus