Electrical

Question 1

With Standby Power OFF Light illuminated , you could power the standby busses directly from the battery by ____.

Answer 1

placing the standby power switch to BAT

Question 2

DC power is supplied by ____.

Answer 2

transformer rectifier units, the battery charger, and the battery

Question 3

Normally, the AC electrical system is run ____.

Answer 3

isolated

Question 4

The static inverter is powered by ____.

Answer 4

the battery

Question 5

The Ground Service Switch is located _________________.

Answer 5

on the forward attendant panel

Question 6

The DC Cross Bus Tie Relay will open ____.

Answer 6

at glideslope capture during a flight director or autopilot ILS approach

Question 7

Circuit breakers are allowed to be pulled and reset ____.

Answer 7

only if specified in a QRH procedure

Question 8

After engine start, the crew forgets to put the generators on line and uses the APU to power the Transfer Busses for takeoff. If the APU fails, the ____.

Answer 8

generators are automatically placed on line

Question 9

On the ground with the APU powering the electrical systems, the APU GEN OFF BUS light will be _____.

Answer 9

OFF

Question 10

When moved to OFF, the BUS TRANSFER switch will ____.

Answer 10

isolate the AC and DC Busses on Electrical System 1 from the AC and DC Busses on Electrical System 2

Question 11

In a normally operating AC electrical system, if the Bus Transfer Switch is moved to OFF, ____.

Answer 11

and if a generator subsequently fails, the bus ties will not close to transfer power

Question 12

If the Standby Power “OFF” light illuminates, it means ____ is/are not powered.

Answer 12

• the AC Standby Bus
• the DC Standby Bus
• the Battery Bus

Question 13

With standby electrical power only, the Captain will be able to fly _____ instrument approaches.

Answer 13

all

Question 14

The AC standby bus can be powered by ____ if its normal power source fails.

Answer 14

the battery (through the static inverter)

Question 15

During an ILS approach, the cross bus tie relay automatically opens at glideslope capture to ____.

Answer 15

prevent single bus failure from affecting both navigation receivers and flight control computers

Question 16

With a normally operating electrical system, placing the Battery Switch OFF ____.

Answer 16

removes power to the Battery Bus and the Switched Hot Battery Bus

Question 17

The DC Standby Bus can be powered by ____.

Answer 17

TR1, TR2, TR3, and the battery

Question 18

Under what conditions can External power power one AC Transfer Bus, and the APU the other Transfer Bus ?

Answer 18

No condition. The electrical system will not allow it.

Question 19

What does an illuminated ELEC light, on the AC and DC Metering Panel, mean?

Answer 19

A Standby Power or DC system fault has occurred.

Question 20

The BAT DISCHARGE Light illuminated indicates excessive battery discharge is detected with the battery switch on. How long will the battery provide power?

Answer 20

A fully charged battery provides a minimum of 30 minutes of standby power.

Question 21

If the TR Unit light illuminates, inflight, it means ____ have failed.

Answer 21

TR1 has failed or TR2 and TR3

Question 22

If the TR Unit light illuminates on the ground, it means ____ has/have failed.

Answer 22

any TR unit

Question 23

In flight, if an engine generator fails, load shedding ____.

Answer 23

is designed to shed electrical load incrementally