Elctrical

Question 1

Placing the GRD PWR switch ON ____

Answer 1

connects external electrical power to both Transfer

Busse

Question 2

Two fully-charged batteries have sufficient capacity to

provide standby power for a minimum of _____ minutes.

Answer 2

60

Question 3

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

Standby Bus.

Answer 3

Static Inverter

Question 4

When standby electrical power is required”,” the A/C

standby bus is powered by _______.

Answer 4

the Main and Auxiliary Battery via the static inverter

Question 5

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

Answer 5

on the ground / DC or Standby

Question 6

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

Answer 6

the APU Generator

2) IDG 2

Question 7

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.

Answer 7

) Automatic Generator On-line Feature

Question 8

Sources of AC power include _____. (Select ALL correct

answers)

Answer 8

1) Battery through Static Inverters.
2) APU Generator
3) Engine-Driven Generators

Question 9

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

Answer 9

AUTO / in the air and on the ground

Question 10

The BUS TRANSFER switch”,” in the AUTO (guarded)

position”,” allows _______.

Answer 10

Bus Tie Breakers (BTB) to operate automatically

Question 11

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

Answer 11

) extinguishes the related GEN OFF BUS light
2) connects related IDG to Transfer Bus
3) disconnects previous source from the related Transfer
Bus
4) all of the above

Question 12

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

Answer 12

excessive

Question 13

The _____ Bus is always connected to the battery

Answer 13

Hot Battery

Question 14

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.

Answer 14

1) Battery Bus
2) AC Standby Bus via the static inverter
3) DC Standby Bus
4) Hot Battery Bus

Question 15

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

Answer 15

There is no paralleling of the AC sources of power.
4) The source of power being connected to a Transfer Bus
automatically disconnects an existing source

Question 16

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

Answer 16

1) IDG failure
2) engine shutdown
3) IDG auto-decouple due to high oil temperature
4) all of the above

Question 17

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

Answer 17

automatically sheds the Galley and Main Busses

Question 18

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

Answer 18

APU GEN OFF BUS (bright blue

Question 19

If neither AC Transfer Bus is powered by an IDG”,”

momentarily positioning either APU GEN switch to ON

Answer 19

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

Question 20

The Cross Bus Tie Relay automatically opens and isolates DC

Bus 1 from DC Bus 2 ______

Answer 20

at Glide Slope capture during a Flight Director or

Autopilot ILS approach