Electrical Knowledge Review

Question 1

Each engine-mounted backup generator contains _____ permanent magnet

generator(s) (PMG).

Answer 1

2

Question 2

The main battery provides standby power to the _____.

Answer 2

Hot battery bus

Battery bus

Left and center flight control busses

Captain’s flight instrument bus

Standby inverter

Question 3

How does the APU generator compare to the IDGs?

Answer 3

It is electrically identical to the IDG’s

Question 4

The backup generator system automatically powers the right transfer bus when _____.

Answer 4

approach mode (APP) is selected

Question 5

Several events can cause the backup AC Electrical system to operate

automatically, one of these events is when _____.

Answer 5

Power to one or both main AC busses is lost.

Question 6

The primary external power AVAIL light illuminates when the _____.

Answer 6

Primary power source voltage and frequency are within limits.

Question 7

On the ground, power transfers are made without interruption, except when _____.

Answer 7

switching between primary and secondary

external power sources

Question 8

What causes the IDG drive to automatically disconnect from the engine?

Answer 8

High generator drive temperature.

Question 9

The entire airplane AC/DC electrical load is supplied by _____.

Answer 9

any two main AC power sources

Question 10

The ground service bus is normally powered by the right main bus.

The _____ and _____ are alternate sources of power.

Answer 10

APU generator, primary external power